Project Euler Tier List
01-Jun-2026
Disclaimer: While some of the criticism here may be valid, remember that I did all of this purely for fun. If you are a problem author and I placed your problem in a low tier, please don't be discouraged!
From my own experience, problem-setting is an art form. So any problem that earns the honor of appearing on Project Euler is already S-tier in my heart.
This post is merely a reflection of my personal tastes. I am a spoiled child who refuses to eat his dinner because vegetables are yucky.
Problem 1000 of Project Euler is releasing this weekend! To celebrate (and lightly brag about being a perfectionist :P), here's a super serious tier list of every single PE problem.
I'll be focusing on the "main campaign", so this list will not include extra DLC such as Problem Zero or any of the bonus problems, because I haven't unlocked all of them ;_;
Of course, all this is subjective, so feel free to have "intellectual debates" with me over at the Project Euler Discord if you disagree.
Lastly, for any special occasion, I'm basically obligated to write something cheesy and sentimental, so all my rambling will go in the appendix.
With all that said, grab some popcorn, fasten your seatbelt, and enjoy the show.
Ranking Scheme
Don't expect me to be remotely consistent about it. This was done over several weeks.
F-tier: Forgotten
No fate is worse than being forgotten. With 1000 problems and counting, you have to stand out. If I barely remember a problem, then I'm sorry, it's automatically F-tier.
I know this is definitely biased toward more recent problems, or easier ones (especially in the first 50 or so) where I can still quickly see the solution. But I think this is a fair compromise if I want any chance of actually finishing this.
B-tier: Baseline
Most problems will fall under this. Nothing especially noteworthy, but a neat problem nonetheless. Basically par for the course for PE. All problems should aim for this first.
C-tier: Cumbersome
For problems that are particularly tedious or uninteresting. Where there's not exactly much insight to be had, and the main difficulty is just figuring out all the details.
D-tier: Dreadful
If a problem is D-tier, that means I really, really struggled with it, and not in a good way. Maybe it was a skill issue on my end, but all that matters is that I had an exceptionally unfun time solving it.
A-tier: Awesome
On the other end of the spectrum, we have problems that take a cool idea and just run with it. Not all A-tier problems are hard, and not all hard problems are A-tier. If I enjoyed solving it, it'll probably end up here.
S-tier: Sensational
Reserved for the problems that have achieved legendary status or left me with truly fond memories. Most problems of this tier are real killers. You've been warned!
Additional Comments
I've also left comments on every problem. Yes, all 1000 of them. You can tap or hover over each grid cell for more info.
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1
Problem 1
S-tier
I can't think of a better problem for this position. So many ways to solve it, with varying levels of efficiency. You don't even need a computer for this. A fantastic introduction to Project Euler.
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2
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3
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4
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5
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6
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7
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8
Problem 8
C-tier
This is less math and more standard programming, so it's unfortunately the first C-tier.
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9
Problem 9
B-tier
B for brute force. I'll give it a pass since Pythagorean triples are cool.
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10
Problem 10
S-tier
S-tier for Lucy's legendary forum post. If you haven't already, definitely go read it. You'll need it for many more problems.
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11
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12
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13
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14
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15
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16
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17
Problem 17
B-tier
Gonna be controversial here and say that if you found this tedious, you should have better programming practices.
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18
Problem 18
A-tier
One of the earliest occurrences of "simple DP". A-tier since I'm feeling generous, but also DP is pretty important.
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19
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20
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21
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22
Problem 22
B-tier
I would've given C-tier since this is barely math, but honestly, this type of problem is incredibly rare nowadays, so it has a certain charm to it.
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23
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24
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25
Problem 25
C-tier
C-tier only because it literally introduces nothing new. Also, bignums.
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26
Problem 26
B-tier
I'm not a huge fan of cycle detection of any kind, but I'll let it pass.
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27
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28
Problem 28
C-tier
C-tier because I remember brute-forcing this and finding it annoying when I was much younger. A higher limit would've encouraged me to find the formula.
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29
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30
Problem 30
B-tier
I was gonna say it's just brute force, but you actually need to prove an upper bound to confirm your answer is correct. I would just YOLO it though.
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31
Problem 31
A-tier
I remember struggling with this for hours. DP is just one of those things that suddenly clicks one day.
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32
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33
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34
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35
Problem 35
B-tier
Pretty much any property you can think of can be applied to prime numbers. I doubt this one is especially mathematically relevant.
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36
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37
Problem 37
B-tier
Even more number properties. At least this one isn't trivially brute-forceable.
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38
Problem 38
C-tier
C-tier because brute force is getting stale now, and this problem adds nothing to the table.
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39
Problem 39
B-tier
I'm slowly realizing that brute force probably wouldn't have been that fast back when these problems were released. Oh well.
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40
Problem 40
B-tier
My brain wants to come up with something elegant, but my hands have already finished whacking it with brute force.
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41
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42
Problem 42
B-tier
Not a math problem, but honestly, I'm just glad it's not brute force.
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43
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44
Problem 44
B-tier
I genuinely can't remember how to justify the correctness of the brute force algorithm.
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45
Problem 45
B-tier
I'm beginning to see a theme of polygonal numbers. I hope it isn't prolonged...
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46
Problem 46
B-tier
Brute force, but there's some smug satisfaction in proving a renowned mathematician wrong.
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47
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48
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49
Problem 49
B-tier
I'm happy for the person who discovered this sequence, but this is getting boring. Sorry.
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50
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51
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52
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53
Problem 53
B-tier
I mean, sure. I don't think they'd introduced binomial coefficients until this one.
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54
Problem 54
A-tier
Despite its apparent tedium, I enjoyed this one. I'd take a straightforward implementation problem any day at this point. If you didn't like this one, I think you just have a skill issue.
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55
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56
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57
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58
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59
Problem 59
S-tier
Not even remotely math, but this is such a cool and unique problem that it deserves S-tier. I guess I just have a soft spot for cryptography. S for soft spot.
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60
Problem 60
B-tier
Just because they're primes doesn't mean the property is interesting, you know?
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61
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62
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63
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64
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65
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66
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67
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68
Problem 68
C-tier
It's tempting to solve this by hand, but it's also tempting to just brute force. This indecision will make you waste a lot more time than necessary. C for conflict.
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69
Problem 69
B-tier
B-tier only because this is the first occurrence of Euler's totient function. The problem itself is meh.
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70
Problem 70
B-tier
Hey, that doesn't mean you need to set 10 totient problems right now.
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71
Problem 71
B-tier
The "intended" solution is definitely important for future problems, but it doesn't really shine here.
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72
Problem 72
B-tier
More reduced fractions. Have you ever considered, I dunno, waiting a few problems?
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73
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74
Problem 74
B-tier
You know it's bad when you find generic number properties interesting again.
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75
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76
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77
Problem 77
C-tier
Reusing the same idea twice in a row is not good problem-setting. C for copycat. I'm tempted to demote Problem 76, but I'm feeling nice.
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78
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79
Problem 79
B-tier
At this point, any problem that's wildly different from the one preceding it is already B-tier.
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80
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81
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82
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83
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84
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85
Problem 85
B-tier
Maybe I'm biased toward thinking combinatorics is easy, but this is just brute force, right?
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86
Problem 86
A-tier
I usually don't like 3D problems (because I suck at visualizing), but this one is the first of its kind, and even a fool like me didn't find it too hard. A for approachable.
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87
Problem 87
B-tier
Maybe my definition of brute force is too broad? Maybe this isn't brute force? I dunno. B for broad.
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88
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89
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90
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91
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92
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93
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94
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95
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96
Problem 96
B-tier
I just don't find pure Sudoku that interesting, unfortunately. B for backtracking.
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97
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98
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99
Problem 99
B-tier
This trick is kinda fun the first time you hear it, but it's certainly a classic.
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100
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101
Problem 101
B-tier
The exposition is unnecessary, to be honest. It's more confusing than helpful.
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102
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103
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104
Problem 104
C-tier
You can't just combine two things and expect the problem to be interesting. Hard pass.
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105
Problem 105
B-tier
I mean this is just brute force, but it's part of a trio, so I'll allow it.
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106
Problem 106
A-tier
I remember being stumped on this one for a non-trivial amount of time. The details have been lost to history.
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107
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108
Problem 108
B-tier
Nice. It's rare to see an easy Part I and a harder Part II these days.
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109
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110
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111
Problem 111
B-tier
I'll allow it since the problem number is thematically relevant. That's not easy to time, you know?
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112
Problem 112
C-tier
You could argue that this is a lead-up to Problem 113, but based on the forums, people actually solved that one first, so yeah. Brute force is boring.
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113
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114
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115
Problem 115
B-tier
It's interesting to see forum posts referring to what I'd call memoized DP as "brute force".
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116
Problem 116
B-tier
DP or brute force or whatever you wanna call it. Words are made up anyway.
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117
Problem 117
B-tier
You have to imagine solvers back then must've gotten bored after four weeks of DP.
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118
Problem 118
C-tier
The next pandigital problem is getting D-tier. That's not a threat. That's a promise.
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119
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120
Problem 120
B-tier
One of many "troll" problems where you just have to try stuff instead of thinking it through.
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121
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122
Problem 122
C-tier
Half of the forum posts are brute force, and the other half is just Googling the answer.
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123
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124
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125
Problem 125
C-tier
Can we not design problems where the first forum post is literally "simple brute force"?
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126
Problem 126
B-tier
Tricky to think about, but unfortunately not in a good way. B for bad at 3D.
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127
Problem 127
F-tier
Sorry. It was inevitable. This was a brute force problem if that helps soften the blow.
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128
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129
Problem 129
F-tier
My memory is starting to get murky, so I'm gonna hand out more F-tiers for plain brute-force problems now. Step it up.
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130
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131
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132
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133
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134
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135
Problem 135
F-tier
I wouldn't consider this brute force, but this is just number theory bashing.
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136
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137
Problem 137
A-tier
If it manages to stand out within this desolate stretch of problems, it's worthy of A-tier.
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138
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139
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140
Problem 140
B-tier
Rip-off of Problem 137. It'd be unfair to rank it lower than B-tier.
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141
Problem 141
B-tier
One of the very few that I first solved before I started the sequential grind, so it deserves a B-tier at least. I have no idea how to solve it anymore though.
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142
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143
Problem 143
B-tier
It was around this point that I had to add "before: 20XX" to all my searches to prevent spoilers. The diagram looks nice and that's about as much as I can remember.
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144
Problem 144
A-tier
Yes, it's brute force simulation, and no, I don't care. It's lasers.
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145
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146
Problem 146
B-tier
I remember having to learn a pretty useful primality test for this problem, so I'll begrudgingly give it B-tier.
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147
Problem 147
F-tier
A shame. I'm sure it was a neat combinatorics problem based on the pretty shapes.
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148
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149
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150
Problem 150
C-tier
Same idea as Problem 149. Triangles make it even less exciting, if anything.
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151
Problem 151
B-tier
Sure. Probability's always fun. The title also stuck with me for some reason.
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152
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153
Problem 153
B-tier
Gaussian integers are pretty neat, and I think this one has a lot of room for optimization tricks, but I don't remember much beyond that.
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154
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155
Problem 155
A-tier
Because resistors never appear again. Ever. And also I suck at physics.
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156
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157
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158
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159
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160
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161
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162
Problem 162
B-tier
Making the answer format hexadecimal is totally thematic and reasonably amusing.
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163
Problem 163
F-tier
Somewhat related to Problem 147. Triangles are fun, but not fun enough for me to remember apparently.
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164
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165
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166
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167
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168
Problem 168
F-tier
The idea is alright, but I'm pretty sure the algebra is not that interesting.
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169
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170
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171
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172
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173
Problem 173
F-tier
Boring brute force. It doesn't help that it's almost identical to the next one. At least the title is somewhat interesting.
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174
Problem 174
F-tier
Boring brute force. It doesn't help that it's almost identical to the previous one. At least the title is somewhat interesting.
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175
Problem 175
F-tier
Pattern bashing is my specialty, but it's also just about the most forgettable type of problem there is unfortunately.
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176
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177
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178
Problem 178
B-tier
Pandigital numbers strike again, but I'll forgive this one since the DP is nice.
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179
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180
Problem 180
B-tier
I have some truly marvelous remarks for this problem, which this text box is too small to contain.
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181
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182
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183
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184
Problem 184
F-tier
There are a lot of triangle-circle counting problems, and all of them are equally forgettable.
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185
Problem 185
A-tier
I like it. It's unique, and also one of the first few I solved way back then.
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186
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187
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188
Problem 188
B-tier
Tetration is one of those things that my brain struggles with for whatever reason.
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189
Problem 189
B-tier
To be fair, I don't think DP was as oversaturated back then as it is now. It's objectively fine.
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190
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191
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192
Problem 192
B-tier
Huh, apparently I took a really long hiatus between this one and the last. I guess I was scared of this problem.
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193
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194
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195
Problem 195
F-tier
Yet another triangle-circle counting problem. I told you there'd be a lot.
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196
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197
Problem 197
F-tier
Troll problem. F-tier because it looked so menacing at first when I didn't remember how to solve it. I was thoroughly disappointed after reading the forum.
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198
Problem 198
F-tier
I know the technique itself is very neato, but I literally can't recall anything about this problem other than that.
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199
Problem 199
B-tier
Colorful circles and fractals and circles and fractals. My brain likey.
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200
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201
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202
Problem 202
S-tier
The a-ha moment for this one was particularly memorable for some reason. I got giddy about Project Euler all over again. Felt like a big boy that day.
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203
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204
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205
Problem 205
A-tier
Yeah I don't really care about the problem, but they need to bring back names like Pyramidal Peter and Cubic Colin. Those were straight fire. It's all Alice and Bob now. Or worse yet, A and B. So uncreative.
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206
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207
Problem 207
F-tier
Ehhh I don't really get what the forum posts are talking about and I kinda don't want to.
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208
Problem 208
B-tier
I struggle with 2D rotations too. I suck at any form of visualization, basically. But this was manageable.
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209
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210
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211
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212
Problem 212
D-tier
So much math-vomit, and even then, it's just a boring data structure problem. It's successfully earned the first D-tier of the list for being such an eyesore. I guess that counts for something, eh?
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213
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214
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215
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216
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217
Problem 217
C-tier
I'm already too lazy to solve anything with more than one case, let alone using DP on it. C for casework.
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218
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219
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220
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221
Problem 221
F-tier
Number theory bait. I don't immediately see how to solve it, so to F-tier it goes.
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222
Problem 222
F-tier
I don't remember really struggling with this one. I probably did though. Maybe D-tier is worse than F-tier? Meh, it doesn't matter.
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223
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224
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225
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226
Problem 226
A-tier
I love the presentation. It's so cute and I want to put it in my mouth.
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227
Problem 227
B-tier
Yet another vanilla probability problem. You can never go wrong with that. Maybe I am just a little biased. It's my comfort topic.
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228
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229
Problem 229
B-tier
Don't let the mention of Euler distract you from the fact that this is just sieve bait.
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230
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231
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232
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233
Problem 233
B-tier
Normally OEIS + brute force would be an immediate F-tier, but I somewhat remember this problem. Sure.
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234
Problem 234
B-tier
Had to re-read the forum for this one. It turns out I'm just a fool.
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235
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236
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237
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238
Problem 238
B-tier
Blum Blum Shub. Blum Blum Shub. I didn't read anything beyond that but Blum Blum Shub. B for Blum Blum Shub.
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239
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240
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241
Problem 241
B-tier
There's a page with all the numbers, but I distinctly remember not wanting to look at it because that'd just be lame. Good work, past me.
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242
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243
Problem 243
B-tier
Ehhh, it's not really a good sign if the first few forum posts involve guessing...
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244
Problem 244
C-tier
"You probably know the game Fifteen Puzzle." Yes I do, but please don't make me implement it for no reason other than busywork, thank you very much.
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245
Problem 245
F-tier
Spiritual successor to Problem 243, now with more forgettable brute force. F for fractions.
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246
Problem 246
F-tier
Look, I have nothing against ellipses, but this just doesn't look that exciting. Sorry.
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247
Problem 247
B-tier
Fine, I kind of remember this one. Whatever. I don't think I liked it that much anyway.
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248
Problem 248
B-tier
My guy Robert in the forums has been running pure brute force on most of the last few problems. Respect.
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249
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250
Problem 250
B-tier
Rip-off of Problem 249, but hey, 250 problems is a milestone worth celebrating.
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251
Problem 251
B-tier
My guy Robert can even clear number theory. I should've noticed him earlier.
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252
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253
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254
Problem 254
B-tier
B for borderline F-tier. Maybe I should've gone with F for factorial.
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255
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256
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257
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258
Problem 258
B-tier
Instant solve for me, but I'm sure this technique wasn't well-known back in the day.
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259
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260
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261
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262
Problem 262
A-tier
The formula is so ugly but so cool. I don't care that it's 3D either.
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263
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264
Problem 264
F-tier
What did I tell you about triangle-circle problems? Have you not learned anything?
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265
Problem 265
B-tier
Robert coming in hot with the brute force. No really, it actually is just brute force.
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266
Problem 266
B-tier
Honestly kinda sick, not gonna lie. Or maybe my bar is way too low now.
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267
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268
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269
Problem 269
F-tier
Oh this one's long too. Not as long as the last one, but yeah. Sorry, where was I? Right, F-tier.
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270
Problem 270
F-tier
Your lowly cute diagrams will not save you from the hands of a god. Fear me.
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271
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272
Problem 272
B-tier
Related to Problem 271, but also completely different. Originality is fun.
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273
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274
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275
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276
Problem 276
B-tier
I keep instant-solving number theory bait. I wanna give out more F-tiers. Agh.
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277
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278
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279
Problem 279
F-tier
Next integer-sided triangle problem immediately gets F-tier. I'm, like, so done. I need a nap.
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280
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281
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282
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283
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284
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285
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286
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287
Problem 287
C-tier
I wouldn't exactly describe it as a "simple algorithm". C for compression.
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288
Problem 288
F-tier
If you had mentioned the name Blum Blum Shub, I would've ignored everything else and you would've gotten at least a B-tier. Sorry, but this is all on you.
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289
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290
Problem 290
C-tier
Not name-dropping anything ain't gonna help either, especially if it's just boring DP.
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291
Problem 291
B-tier
The lore behind the title was enough to pull this out of F-tier. Take that as a lesson, all of you.
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292
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293
Problem 293
F-tier
*pseudo-fortunate. Are we just randomly capitalizing and not capitalizing things now? What is pseudo-Fortunate? What are we even doing? F for Fortunate. I'm annoyed. Not like I wasn't already.
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294
Problem 294
C-tier
You're trying too hard with the title. It would've been B-tier otherwise.
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295
Problem 295
A-tier
"Lenticular" is such a scrumptious word. A-tier for that alone. I don't care what the problem's about.
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296
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297
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298
Problem 298
B-tier
It's probability. You know the rules. Also, "selective amnesia" is basically what I'm going through right now.
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299
Problem 299
B-tier
Not eligible for F-tier because I remember whipping out GeoGebra for this. Sigh.
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300
Problem 300
F-tier
Can I just say that the new GeoGebra online UI looks horrible? I swear it's gone through several changes by now, and each one has made it worse. It's almost unusable in its current state. Is this a sign I should just install GeoGebra instead of using the web version? Maybe it's like WolframAlpha vs. Mathematica, you know? Maybe. We'll see. Online GeoGebra is still sufficient for my use cases, but just barely. I mean, I honestly only use GeoGebra for Project Euler anyway, so. Yeah. This problem literally has nothing to do with GeoGebra, by the way. I'm just using this cell as a placeholder.
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301
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302
Problem 302
F-tier
You can't just name something after Achilles and expect it to automatically be more interesting.
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303
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304
Problem 304
C-tier
The classic problem-setting technique of combining two totally unrelated things. I'm not encouraging this.
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305
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306
Problem 306
A-tier
I'm ranking all the combinatorial game theory ones at least B-tier, just so you know. A new comfort topic has entered the game.
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307
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308
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309
Problem 309
F-tier
Surely you should've learned not to begin your title with "Integer" by now?
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310
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311
Problem 311
F-tier
"Biclinic" is... no, it doesn't roll off the tongue, sorry. Also, you put "Integer" in the title again.
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312
Problem 312
A-tier
Cyclic Paths on Sierpinski Graphs. It rhymes. I love it. I also enjoy the occasional special character in my title, like the 'n' in Sierpinski. Though, I don't dare to mess around with that in this text box.
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313
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314
Problem 314
A-tier
A good story is all it takes for me to enjoy geometric optimization.
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315
Problem 315
F-tier
Oh, we're playing with GIFs now? That's kinda fun. Still F-tier though. No mercy.
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316
Problem 316
B-tier
tfw "choosing a random real number from the interval [0, 1) is equivalent to choosing an infinite sequence of random digits", measure theory mfs shaking and crying rn
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317
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318
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319
Problem 319
B-tier
I remember solving this while waiting for my food order. I got a burger and fries that day. I practically have savant syndrome, not gonna lie. Okay, but, I always get a burger and fries. B for burger. I'm hungry. It's closed right now. I'm sad. I want my burger :(
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320
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321
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322
Problem 322
F-tier
Anyone who uses that notation for binomial coefficients is a psychopath. F-tier. Get out.
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323
Problem 323
B-tier
It's a probability problem. Anyway, the worst part about Sundays is that pretty much everything around here is closed. Including the burger place. Especially the burger place. It doesn't open until 6 PM. The buses only come every 30 minutes instead of the usual 5. The burgers aren't even that good. It's just reheated shoe leather. And yet I still want them. But I can't. So I'm just stuck here, rotting in my room. Alone. Hungry. Heartbroken. And, most devastating of all, burgerless.
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324
Problem 324
F-tier
Fine, I'll stop being such a buzzkill. I'm gonna go grab something to eat. Something that isn't a burger. Sigh. Be right back.
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325
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326
Problem 326
F-tier
Sike, I WILL be eating a burger, and there's nothing you can do to stop me. I'm waiting for the bus now. I'm going to a proper burger place too. I want Shake Shack.
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327
Problem 327
C-tier
Oof, that's a lot of words. C for... cards? Yeah, I think that's one of them.
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328
Problem 328
D-tier
Aw hell nah. I remember pulling an all-nighter for this. It wasn't worth it at all. D for DP optimization. Stinky.
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329
Problem 329
B-tier
Yet another probability problem. 4 more stations to go. I can smell the burgers already.
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330
Problem 330
A-tier
I honestly don't remember much, but it looks scary. But like, the good kind of scary. Also, it's Euler's number. I couldn't put it below A-tier even if I wanted to.
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331
Problem 331
A-tier
This was the first problem I solved with a 100% difficulty rating, back when that was still a thing. It's actually much tamer than I expected.
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332
Problem 332
B-tier
Painful enough to remember, but not enough for C-tier. I suck at spherical geometry.
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333
Problem 333
F-tier
Ladies and gentlemen, I've arrived at Shake Shack. I repeat: I've arrived at Shake Shack. The order is in. Burger consumption is nigh, folks.
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334
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335
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336
Problem 336
B-tier
Brute force, but I like the trains. Also, Simple Simon is such an adorable name.
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337
Problem 337
B-tier
Classic data structure problem. We haven't had those in a while. Robert probably would've brute-forced it.
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338
Problem 338
A-tier
Another 100%-rated problem for the books. Just for a brief moment, I thought, "Hey, I might be able to solve everything, you know?"
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339
Problem 339
B-tier
I like the story, but apparently this exact set-up was taken from an old math textbook. So I guess it kinda cancels out.
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340
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341
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342
Problem 342
F-tier
Man, that hit the spot. I had a burger, some nuggies, and a vanilla shake. I have no regrets. Well, maybe just a little. My wallet is hurting right now. But it was worth it. F for financially irresponsible.
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343
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344
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345
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346
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347
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348
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349
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350
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351
Problem 351
A-tier
A rite of passage for many more problems down the line. We finally found good number theory bait.
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352
Problem 352
B-tier
Another instance of a statement being retroactively fixed because the developers made a mistake. Again, B for boo-boo.
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353
Problem 353
C-tier
Unfortunately, this is beyond my tolerance of 3D geometry. I didn't like this one.
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354
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355
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356
Problem 356
F-tier
Yeah I have no idea what's going on in the forums. F for floor function?
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357
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358
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359
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360
Problem 360
F-tier
if the sphere is so "scary" then why can't i remember anything??? checkmate, sphere-truthers!!!
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361
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362
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363
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364
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365
Problem 365
B-tier
so-called "huge binomial coefficient" mfs when i recycle the same joke
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366
Problem 366
B-tier
More pattern bashing. Then again, that's basically most combinatorial game theory problems. I don't see an issue with that.
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367
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368
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369
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370
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371
Problem 371
B-tier
I remember people were crashing out in the forums over the "poor" wording of the problem. Well, I got it first try, so. Seems like a skill issue to me, to be honest.
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372
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373
Problem 373
F-tier
Have you ever thought about triangles with non-integer sides? Huh? How do you think they feel about being left out?
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374
Problem 374
F-tier
What makes a problem pattern bash? What makes a problem pattern bait? How are they different? These are the questions that keep me up at night.
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375
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376
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377
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378
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379
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380
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381
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382
Problem 382
F-tier
Pattern... bait. It's pattern bait. Yeah. Stop looking at me like that.
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383
Problem 383
F-tier
Okay, so, it's bait when there's a high chance it'll work, and it's bash when there's seemingly a lower chance, right? Like, bait, fish bait, the fish are likely to go for it, you know what I mean? And then bash is just throwing stuff against the wall and hoping for the best, right? Like, if all you have is a hammer, everything looks like a nail, right? You- you bash with the hammer. The fish take the bait. Bash. Bait. They're different. Does that make sense? Am I crazy? Hey, where are you going?
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384
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385
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386
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387
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388
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389
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390
Problem 390
F-tier
Oh, you actually have a problem involving triangles with non-integer sides. Huh. A shame that it's F-tier, eh? This is awkward.
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391
Problem 391
F-tier
Ah. This is combinatorial game theory. I can't seem to remember anything. Oh dear.
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392
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393
Problem 393
A-tier
I have to respect a problem that already gives you f(4) but only asks for f(10). Problems with threatening auras.
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394
Problem 394
S-tier
My very first non-trivial use of Mathematica. I felt like a mad scientist when I solved it.
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395
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396
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397
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398
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399
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400
Problem 400
B-tier
A pattern is a regularity in the world, in human-made design, or in abstract ideas. As such, the elements of a pattern repeat in a predictable and logical manner. There exists countless kinds of unclassified patterns, present in everyday nature, fashion, many artistic areas, as well as a connection with mathematics.
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401
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402
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403
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404
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405
Problem 405
C-tier
Spot pattern, find formula, optimize formula. This recipe is getting dull now.
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406
Problem 406
A-tier
Somewhat reminiscent of Problem 328, but actually good this time. A-tier for the solid redemption arc.
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407
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408
Problem 408
B-tier
There's a new guy in town. My guy Stimmer straight-up brute-forced it. I'll observe him with great interest.
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409
Problem 409
F-tier
It's combinatorics. Combinatorial game theory, even. Maybe if you gave me 20 minutes, I could re-derive it. But rules are rules, so I have to pull the trigger ;_;
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410
Problem 410
F-tier
You've heard of integer triplets. Now get ready for... integer quadruplets.
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411
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412
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413
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414
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415
Problem 415
B-tier
I also remember solving this while waiting for another food order. Let's not open that can of worms again.
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416
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417
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418
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419
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420
Problem 420
F-tier
Forgettable number-theory-maxxing. It's so easy to categorize things now. Why couldn't I have done this earlier?
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421
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422
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423
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424
Problem 424
A-tier
Now I *really* feel like I'm back to the first 100 problems, and I genuinely feel nostalgic. Nice.
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425
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426
Problem 426
C-tier
Reminds me of Problem 334. Unfortunately, I have slightly less respect for this one.
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427
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428
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429
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430
Problem 430
C-tier
There's been a nice alternating pattern of F's and C's, so sure. Better than F-tier, I guess.
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431
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432
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433
Problem 433
F-tier
It's a good thing Euclid invented the GCD algorithm and not Euler, or I'd be flamed for this.
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434
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435
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436
Problem 436
S-tier
The first time I successfully used "university-level" calculus to solve a problem. I'm such a calculator!
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437
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438
Problem 438
S-tier
I cackled like a maniac when my spaghetti code (split across 10+ separate files) actually worked after almost a day of running it. I don't care if the forum posts run well under a minute. I earned this.
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439
Problem 439
F-tier
tfw sublinear-number-theoretic-summation but you forgor again :skull:
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440
Problem 440
B-tier
I fired a single neuron just so this could be B-tier. B for brain damage.
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441
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442
Problem 442
C-tier
Call me a neural network the way I be firing them neurons :sunglasses:
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443
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444
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445
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446
Problem 446
F-tier
The sequel to Problem 445 we didn't need. Math-vomit 2: Vomit Harder.
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447
Problem 447
F-tier
lol i actually forgot there were 3 parts to this mess, i've genuinely had a huge headache all day
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448
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449
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450
Problem 450
F-tier
If I need to scroll to read the whole problem, you're doing it wrong.
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451
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452
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453
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454
Problem 454
F-tier
Does sublinear-number-theoretic-summation count as number theory? I mean, it's literally in the name, but does it really?
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455
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456
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457
Problem 457
F-tier
Is primemaxxing a subcategory of number-theory-maxxing? Isn't everything technically number-theory-maxxing if you think about it?
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458
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459
Problem 459
A-tier
It feels great to rediscover a pattern on your own, even if it turns out to be "well-known".
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460
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461
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462
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463
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464
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465
Problem 465
B-tier
You thought this was geometry, but it was me, sublinear-number-theoretic-summation!
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466
Problem 466
C-tier
I distinctly remember this sublinear-number-theoretic-summation problem being unfun, so eat it.
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467
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468
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469
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470
Problem 470
B-tier
I would turn a blind eye to any annoyances, as long as it's a probability problem.
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471
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472
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473
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474
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475
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476
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477
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478
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479
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480
Problem 480
A-tier
They had the rare opportunity to make the answer alphabetic instead of numeric, and I think they executed it flawlessly.
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481
Problem 481
B-tier
Hah, they really *cooked* with this one. Get it? Because there are chefs and they... whatever. It's a probability problem. Shut up.
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482
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483
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484
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485
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486
Problem 486
B-tier
At this point, I think a neural network would do a better job ranking these.
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487
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488
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489
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490
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491
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492
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493
Problem 493
B-tier
If probability has a million fans, I'm one of them. If probability has ten fans, I'm one of them. If probability has one fan, that's me. If probability has no fans, I am dead. If the world is against probability, I am against the world.
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494
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495
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496
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497
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498
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499
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500
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501
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502
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503
Problem 503
B-tier
It's a public holiday. Everything is probably closed. I might be cooked.
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504
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505
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506
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507
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508
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509
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510
|
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511
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512
Problem 512
F-tier
I mean, it's a public holiday so hardly anyone's here. Anyway, can I just rant about hotpot etiquette? Like, I have friends (allegedly), and whenever we go out for hotpot together, we order one single bowl for all of us. But like... that's just not enough for me. I know the whole point is that we split the bill so it's "cheaper", I know. But I'm a tall, growing boy! I need my nutrients! Hotpot is just soup with pieces of meat and veg floating around. Splitting that between 3-4 people doesn't help. Why don't we just get one bowl each? You know, every time I go for one of these "solo sessions", I order one bowl for myself. Am I the selfish one? Do I just look like a lonely loser when I eat an entire bowl of hotpot all by myself? What's going on? Am I seriously the crazy one here?
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513
Problem 513
F-tier
You know what? No. Screw you. I'm out here, eating my bowl of hotpot, laptop out, ranking my Project Euler problems. And no one can stop me.
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514
Problem 514
A-tier
It's geometry, but it's also probability, and the numeric answer looks neat.
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515
Problem 515
F-tier
Most people would go for the standard yellowish brick of ramen in their hotpot. But not me. I'm more of a purple brick kind of guy. I have no idea what it's made of.
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516
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517
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518
Problem 518
F-tier
Google is proving unhelpful. Imagine it's just a regular ramen brick but with food coloring, lol.
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519
Problem 519
F-tier
F for fountain, I think? I'm too busy thinking about purple ramen, sorry.
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520
|
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521
Problem 521
A-tier
I finally got around to learning and implementing "the trick" because of this problem.
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522
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523
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524
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525
Problem 525
C-tier
It doesn't count as 2D geometry if it involves motion, right? I don't suck at 2D geometry. I don't.
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526
Problem 526
C-tier
Boring brute force. Dude, I hate it when you drop the food you're holding into the soup and it splashes everywhere.
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527
Problem 527
C-tier
More of a numerical exercise than a probability problem. C for copium.
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528
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529
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530
Problem 530
F-tier
You know, the other day my coworker/school friend told me I use way too much Gen-Z language. I couldn't possibly imagine why they'd think that. Anyway, this problem is just number-theory-maxxing.
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531
|
532
Problem 532
C-tier
I just whacked Mathematica until it spat out something coherent. Spherical geometry is for neeerds.
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533
Problem 533
B-tier
I'm sorry, but Carmichael is such an unintentionally funny name though. Car Michael. No offense to my guy, I promise.
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534
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535
|
536
Problem 536
F-tier
The sun is shining directly on my laptop screen and holy moly is it dusty. I can't see anything.
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537
Problem 537
F-tier
Okay let me just finish the rest of the soup, then let's get out of here.
View Problem
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538
|
539
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540
|
|
541
|
542
|
543
|
544
Problem 544
C-tier
You kinda cursed yourself by making the title two C-words. C for curse, ha.
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545
|
546
Problem 546
F-tier
See, the title is cool enough to be promoted from F-tier, but like, D-tier is worse than F-tier in my mind.
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547
|
548
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549
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550
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551
|
552
Problem 552
F-tier
No. You already made that pun 21 problems ago. You can't just slap a "II" on it and call it a day.
View Problem
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553
|
554
|
555
Problem 555
C-tier
I'm sure the original function is historically significant, but this problem is just a pain to analyze.
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556
|
557
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558
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559
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560
|
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561
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562
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563
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564
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565
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566
Problem 566
A-tier
Yeah, you know I had to rank this one high. It seems so innocuous, but it's a real beast of a problem. The only reason it's not S-tier is because I solved it too quickly? At least, I didn't find it as difficult as many other experienced solvers claimed. But anyway, cake, mmm...
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567
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568
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569
Problem 569
B-tier
Solved this one while walking around a lake, back when I was healthier :/
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570
Problem 570
B-tier
I'm not overweight by any means, but yeah, I should really start exercising again.
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571
Problem 571
F-tier
There's just no time, you know? There's just no time. At least, that's the excuse I always make. Sigh.
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572
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573
Problem 573
F-tier
This is not a probability problem. This is a pattern problem. What do you mean I'm cherry picking?
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574
|
575
Problem 575
A-tier
I specifically remember that one guy crashing out in the forums because the story was "verbose" and left him "disgusted". Cry harder, lol.
View Problem
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576
|
577
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578
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579
Problem 579
A-tier
This problem sucked, but it's getting A-tier. Turns out I was the one sucking. Not like that.
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580
|
|
581
|
582
Problem 582
F-tier
I had to Google whether "forty-seven" was hyphenated for the last comment, and apparently Merriam-Webster simply defines it as "being one more than 46". That has a lot of existential implications that I'm not ready to think about.
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583
Problem 583
F-tier
Wait, why does Merriam-Webster have an entry for 47? How far up does it go? What about negative numbers? Oh god.
View Problem
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584
Problem 584
B-tier
Reading comprehension exercise, but it's probability, so, you know the drill.
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585
|
586
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587
Problem 587
B-tier
Triangle-circle, but I'm pretty sure a smart middle schooler could solve this, so I physically and emotionally can't put this below B-tier.
View Problem
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588
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589
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590
Problem 590
F-tier
Having two italicized capital letters as a function name is DISGUSTING
View Problem
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591
Problem 591
C-tier
I was briefly considering F-tier, but I remember just enough to give it C-tier. Also, there's like this huge ugly splotch of blue F's forming in the bottom-left corner, so I'm trying to make a border to keep it from leaking into the next grid.
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592
Problem 592
B-tier
What did I give the first one? B-tier? Wow, I was so generous back then. "Back then", as if I wasn't doing all this in just a few weeks.
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593
Problem 593
B-tier
Good news: the splotch has been contained. I repeat: the splotch has been contained. We have everything under control now.
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594
Problem 594
D-tier
My eyes rolled back into my head. D for delete this problem. Please.
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595
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596
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597
Problem 597
A-tier
My method was pretty messy and all over the place, but I enjoyed solving this problem, and that's all that really matters. Boat :)
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598
Problem 598
F-tier
Apparently, "combinatorics" is one of the tags. That's just fake news.
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599
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600
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|
601
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602
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603
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604
Problem 604
C-tier
Solved this one at the supermarket. Unfortunately, this one's just not that interesting. C for consumerism.
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605
|
606
Problem 606
F-tier
Do you think repeating the same pun will spare you from condemnation? You are such a simple-minded child.
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607
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608
Problem 608
F-tier
Apparently there are only around 40 sublinear-number-theoretic-summation problems in total, but it feels like I've seen twice as many.
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609
Problem 609
F-tier
I expected a transcendental constant, but instead I got a lame prime-counting function.
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610
Problem 610
B-tier
Oh, I actually rated the original C-tier. Guess I've always had standards, huh? B for blast in the past.
View Problem
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611
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612
Problem 612
F-tier
Friend numbers? More like freaky numbers, am I right? Because they, uh, they kinda get a little *freaky* sometimes, you know what I mean? Why are you staring at me like that?
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613
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614
Problem 614
F-tier
Apparently I ranked the original during my burger meltdown. So there's that.
View Problem
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615
Problem 615
B-tier
Ah, no, this title is definitely longer. Surely we can't get even longer, right? There's no way.
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616
Problem 616
F-tier
Creative numbers? More like creaky numbers, am I right? Because they, uh, they kinda get a little *creaky* sometimes, you know what I mean? Why are you staring at me like that?
View Problem
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617
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618
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619
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620
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621
Problem 621
F-tier
I am allergic to all kinds of triangles. Including triangular numbers.
View Problem
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622
|
623
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624
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625
Problem 625
B-tier
Look, I have nothing against sublinear-number-theoretic-summation, but I'm too lazy for it. Straight up.
View Problem
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626
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627
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628
|
629
|
630
Problem 630
C-tier
I am happy Blum Blum Shub is back, but I am devastated that it wasn't named. Justice for Blum Blum Shub ;_;
View Problem
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631
|
632
|
633
|
634
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635
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636
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637
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638
Problem 638
C-tier
Combi- oh, wait, never mind, you forgot a period at the end of your sentence. Sorry
View Problem
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639
Problem 639
C-tier
Well, sublinear-number-theoretic-summation, at least this problem is unforgettable. Congrats? I guess?
View Problem
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640
Problem 640
B-tier
I saw "expected" and I immediately Alt-Tabbed back to the tier list.
View Problem
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641
|
642
Problem 642
F-tier
To their credit, this was released in 2018. But in November. So they should've used 2019. Sorry.
View Problem
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643
|
644
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645
|
646
Problem 646
F-tier
No offense to my guy, but Liouville is such an unintuitive spelling and I hate it.
View Problem
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647
Problem 647
F-tier
Triangular numbers weren't enough, huh? You just had the bring the whole zoo.
View Problem
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648
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649
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650
|
|
651
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652
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653
Problem 653
B-tier
I would've had way less fun if I hadn't seen something like this before.
View Problem
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654
|
655
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656
|
657
Problem 657
F-tier
Not a combinatorics problem. I don't remember it. Shut up. Cry about it.
View Problem
|
658
|
659
|
660
Problem 660
F-tier
The blue mold is spreading like wildfire, and yet here you are with your pandigital triangles?!
View Problem
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661
Problem 661
F-tier
F-tier for A and B. You even had the audacity to MathJax their names.
View Problem
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662
Problem 662
F-tier
Speaking of professionalism, when is it professional to publicly bash someone who is going through a hard time?! LEAVE FIBONACCI ALONE!!! PLEASE!!!
View Problem
|
663
|
664
|
665
Problem 665
F-tier
Enough is enough! I have had it with these monkey-fighting piles of stones on this Monday through Friday website!
View Problem
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666
|
667
Problem 667
A-tier
I drunkenly stumbled through this problem with GeoGebra, and it was so worth it. By the way, can I just say that the new GeoGebra online UI looks horrible? I swear it's gone through several changes by now, and each one has made it worse...
View Problem
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668
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669
Problem 669
B-tier
Solved this one while babysitting a "competitive programming" class for high schoolers. Not that I was much older than them.
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670
Problem 670
A-tier
This problem and its sequel were submitted by griff, and I've just had the horrifying realization that of all the problems they've submitted which I've ranked so far, two of them were F-tier, and none of them got any serious comments from me. I'm so, so sorry griff. It completely slipped my mind. I was just trying (and failing) to be funny. I really didn't mean to. I promise.
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671
Problem 671
A-tier
These two problems are good, okay? I mean it. Im' not trying to make yoou feel better.. I just reallly like combinatorrics, ookay? I know yoou'err aan adminnbut please don;'t ba,n, ..me fromm thhe Di;sscor,d,, ,pleasee pleasse plee;;ase please phlease
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672
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673
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674
|
675
Problem 675
B-tier
Real ballsy move making the title entirely MathJax. I gotta respect that.
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676
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677
|
678
Problem 678
F-tier
You know, I mentioned to one of my good friends today that I was making a Project Euler tier list. Then I got told I was psychotic.
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679
|
680
|
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681
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682
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683
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684
|
685
|
686
|
687
|
688
Problem 688
B-tier
I vaguely remember the set-up, so good job, sublinear-number-theoretic-summation.
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689
|
690
Problem 690
B-tier
I left this running while I went out, as you do. But to my horror, my laptop was out of power when I got back. Luckily, it had finished running before that, so everything was fine. B for battery consumption.
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691
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692
Problem 692
B-tier
Can someone tell me what Siegbert and Jo are references to? I genuinely have no idea.
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693
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694
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695
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696
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697
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698
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699
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700
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|
701
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702
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703
|
704
|
705
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706
|
707
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708
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709
|
710
Problem 710
F-tier
Listen, I'm happy that Project Euler's membership has grown so much, but I literally don't remember anything about this problem.
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711
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712
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713
Problem 713
C-tier
You got the accent right in the title, but not in the actual statement?
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714
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715
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716
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717
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718
Problem 718
F-tier
The only thing "unreachable" about these numbers is my brain's inability to reach them, amirite?
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719
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720
Problem 720
F-tier
The only thing "unpredictable" about these permutations is my brain's inability to remember making the same joke two problems ago, amirite?
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721
|
722
Problem 722
F-tier
Actually, do people even read these? Or do they just care about my thoughts on the "famous" ones?
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723
Problem 723
F-tier
Okay, I wanna try an experiment. If you (yes, you) are reading this, ping me in the Project Euler Discord and ask for my thoughts on waffles with no further context.
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724
Problem 724
B-tier
We interrupt your regularly scheduled rambling to bring you this probability problem.
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725
Problem 725
F-tier
But anyway, if you're not reading these sequentially and you're just hovering over random cells, you are seriously missing out.
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726
Problem 726
B-tier
Once again, we interrupt your regularly scheduled rambling to bring you this combinatorics problem.
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727
Problem 727
F-tier
The unfunny jokes! The callbacks! The running gags! The narrative! And the lore! Oh my gosh, the lore!
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728
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729
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730
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|
731
|
732
Problem 732
C-tier
I got "troll"-ed by this problem, heh. Get it? C for comedic mastermind.
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733
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734
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735
|
736
|
737
|
738
|
739
|
740
|
|
741
|
742
|
743
|
744
Problem 744
C-tier
C-tier for nerd-sniping me while I was hanging out with my good friend. I pulled out my laptop and everything. I mean, my friend was cool with it, but still.
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745
|
746
|
747
Problem 747
D-tier
I let my program run for nearly a week because I was *that* hellbent on solving this. Then I had a "eureka moment" in the shower. I quickly coded something up, and it ran in 6 minutes. Must've felt real smart after that, huh?
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748
|
749
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750
Problem 750
C-tier
They managed to set a problem as boring as solitaire. I guess it's on theme, eh?
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751
Problem 751
C-tier
People in the forums were concerned about the lack of proof. It's been 5 years. Is anyone up for it?
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752
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753
Problem 753
F-tier
I have some truly marvelous remarks for this problem, which my brain is too small to contain.
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754
Problem 754
F-tier
Oh they're just name-dropping everyone at this point, huh? First it was Fermat, and now it's Gauss. Who's next? Zeckendorf?
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755
|
756
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757
|
758
Problem 758
F-tier
It's not a good sign when the first forum post begins with "Under careful scrutiny..." Really now.
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|
759
Problem 759
F-tier
This website is somehow gonna exhaust the infinite number of sequences out there.
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760
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761
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762
|
763
Problem 763
S-tier
I was sitting mindlessly in some boring class, daydreaming about amoebas. Well, not exactly daydreaming. And not exactly amoebas either. Just dots, floating around in 3D space. It had only been a few days, but I'd already spent so many hours on this problem. I was frustrated. None of my ideas were working. I even wrote a blog post complaining about it. But no one was there to listen except me. I had to solve this problem. And just like that, I saw it. The faint light at the end of the tunnel. I sketched out some drawings after class. I tested my hypothesis on my laptop. It was correct. I rushed home and finished the job. There it was. The man with the green tick. And for a brief moment, the faceless figure looked at me with his crooked thumbs-up and said, "You've done well, kid. You've done well." But yeah, anyway, this problem isn't too difficult. You should give it a try :)
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764
|
765
|
766
Problem 766
B-tier
You know, I genuinely don't mind a plain old backtracking implementation problem. I need to reset my brain.
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767
|
768
|
769
|
770
|
|
771
|
772
Problem 772
F-tier
Problem-setting tip: Out of ideas? Just pick some random adjectives from the dictionary!
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|
773
|
774
Problem 774
C-tier
C for conjunctive. Maybe next time pick something from the A section?
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775
|
776
|
777
Problem 777
C-tier
The curves were pretty, but I didn't like solving it, unfortunately. C for curves.
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778
Problem 778
F-tier
Why would you pick something that looks like a Unicode error to represent your operator?
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779
Problem 779
F-tier
p-adic? more like pee-adic am I ri- [tomato] ow stop- [tomato] [tomato] [tomato] hey that hurts ow- [tomato] [tomato] [tomato] i'm sorry- [tomato] [tomato] [tomato] [tomato] please stop- [tomato] [tomato] [tomato] [tomato] [tomato]
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780
Problem 780
C-tier
You know, despite its reputation as one of the hardest problems on Project Euler, it genuinely wasn't that bad. If anything, it was just an exercise in patience.
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781
|
782
Problem 782
C-tier
Solved this one on the train. Would not recommend. It was a headache without scratch paper.
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783
|
784
|
785
|
786
|
787
|
788
|
789
|
790
Problem 790
C-tier
I will not STAND for this Blum Blum Shub ERASURE, you %@\$#*\$@*#%\$@*#\$
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791
Problem 791
F-tier
"Hmm, that modulus looks kinda strange, let me just Google- bruh it's a Fibonacci prime"
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792
Problem 792
A-tier
Solved this one in the middle of a lecture. Sorry prof. It was too interesting to leave for later.
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793
Problem 793
F-tier
Nah nah, they're doing this on purpose. WE BLUM BLUM SHUBBERS WILL NOT BE SILENCED YOU @\$#%\$#*\$@*%#%@\$
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|
794
|
795
|
796
|
797
Problem 797
A-tier
Cyclogenic is NOT a word and you can't convince me otherwise, but I'll allow it. This one's pretty good.
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|
798
|
799
|
800
|
|
801
Problem 801
B-tier
Also solved this one on the train. No scratch paper needed. I'm a big boy.
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|
802
|
803
Problem 803
A-tier
Rare moment where the dev team got creative again. You love to see it.
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|
804
|
805
Problem 805
C-tier
The idea is *fine*, alright? I just feel like I've seen this problem five times already.
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|
806
|
807
|
808
Problem 808
C-tier
We're back to the first 100 problems again, huh? Contractually, I have to give C-tier, but you know, I'm not complaining.
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|
809
Problem 809
B-tier
Not A-tier only because I'm bad at recursion. B for bad at recursion.
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|
810
|
|
811
|
812
Problem 812
S-tier
D for dynami- nah jk, I could never. Despite the Mathematica-whacking and pattern-spotting and paper-reading, it was an oddly satisfying experience throughout.
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|
813
|
814
Problem 814
C-tier
Why are the people screaming? Are they okay? Do they need help? I'm so confused and concerned.
View Problem
|
815
|
816
|
817
|
818
Problem 818
C-tier
SET is a registered trademark of Cannei, LLC. All rights reserved. Used with permission from PlayMonster, LLC.
View Problem
|
819
|
820
|
|
821
Problem 821
C-tier
griff, I love that your research led to this problem, but this is just insane.
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|
822
Problem 822
B-tier
This problem folded INSTANTLY because it was simply too scared of my aura.
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|
823
|
824
Problem 824
D-tier
D-tier for the unnecessary stinky modulus. It would've been C-tier otherwise. Hell, maybe even B-tier.
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|
825
|
826
|
827
|
828
Problem 828
B-tier
If the ID only had two digits, it would've been C-tier. But you know, it's been a while. B for brute-force.
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|
829
Problem 829
C-tier
You can't put "integral" in the title and then make the problem not calculus. That's against the law.
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|
830
|
|
831
|
832
|
833
Problem 833
C-tier
I have obtained a bowl of cereal. It is time to consume. It is time to crunch. C for cereal.
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|
834
Problem 834
F-tier
Cereal is kind of a strange food. Like, it's basically flavorless, but the textural sensation is pretty decent. Probably the most mid food imaginable. Maybe that's why it's a breakfast food. Not like I'm eating it during breakfast hours, but still.
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|
835
Problem 835
B-tier
Number-theory-maxxers when I finally give one of their problems B-tier again
View Problem
|
836
|
837
|
838
|
839
|
840
|
|
841
|
842
|
843
Problem 843
A-tier
Surprisingly deep problem. You know it's gonna be fire when the statement starts off by referring to itself in the third person: "This problem involves..."
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|
844
Problem 844
F-tier
...What do you do with the rest of the milk in the bowl? I pour it into a cup and drink it. Am I crazy for this? Surely not, right?
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|
845
Problem 845
B-tier
Despite its shortcomings, I just like when a statement is short enough to fit on a sticky note.
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|
846
Problem 846
C-tier
C for cycles. Good to have a straightforward comment every now and then, huh?
View Problem
|
847
|
848
|
849
|
850
Problem 850
F-tier
Did you know corn flakes were originally invented as an anti-aphrodisiac? Not to brag, but I don't really think they're doing much for me, to be honest with you.
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|
851
|
852
|
853
|
854
|
855
|
856
|
857
|
858
Problem 858
B-tier
The best thing about saying I've seen something like this one before is that now you have 850+ problems to dig through. Mwahahaha.
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|
859
Problem 859
S-tier
I solved this without knowing the relevant combinatorial game theory knowledge. And my god, when I reinvented it, I felt like I was one with the cookies.
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|
860
Problem 860
A-tier
Yeah, we're getting back to stuff I can easily remember now. All combinatorial game theory problems from now on will surely get at least B-tier. Unless they're particularly bad for some reason.
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|
861
Problem 861
C-tier
It's sublinear-number-theoretic-summation, and it's NOT an instant F-tier. Oh yeah, we're in the endgame now.
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862
|
863
Problem 863
B-tier
Probability, and I will just close my eyes and pretend that one math-vomit paragraph doesn't exist.
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864
|
865
|
866
|
867
|
868
|
869
|
870
Problem 870
C-tier
It's combinatorial game theory, I know. C-tier only because I was solving this in the computer lab and someone (very sensibly) asked me, "What on earth are you doing?"
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|
871
Problem 871
C-tier
One more Codeforces problem for the books, but hey, I'll gladly take it at this point.
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|
872
Problem 872
B-tier
I drew some pretty figures and spotted some pretty patterns. B-tier.
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|
873
|
874
|
875
Problem 875
B-tier
My school friend saw me working on this one and asked how many Project Euler problems I'd solved. I said I had just under 100 left and he was like o_0
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|
876
Problem 876
A-tier
Got distracted by this one during an intro linear algebra class. Finally, a good use for MATLAB.
View Problem
|
877
|
878
|
879
|
880
|
|
881
|
882
|
883
|
884
|
885
Problem 885
B-tier
Combi- no, wait, DP. Actually, well, hmm... Meh, doesn't really matter. It's easy.
View Problem
|
886
|
887
Problem 887
B-tier
Significantly tamer version of Problem 328. I'm just glad I didn't have to burn several hours on this.
View Problem
|
888
|
889
|
890
|
|
891
|
892
|
893
Problem 893
A-tier
Again, mostly busywork, but it really feels like I'm back in the double-digit problems again.
View Problem
|
894
|
895
|
896
|
897
Problem 897
C-tier
You already know what's coming. Geometric optimization is for neeerds.
View Problem
|
898
Problem 898
A-tier
My sympathies go out to the confused forum user who asked what "Claire Voyant" meant. Lol.
View Problem
|
899
|
900
|
|
901
|
902
|
903
|
904
|
905
Problem 905
A-tier
I don't know how to solve this. I don't know how to solve this. I don't know how to solve this. I don't know how to solve this. I don't know how to solve this. I don't know how to solve this. I don't know how to solve this. I don't know how to solve this. I don't know how to solve this. I don't know how to solve this. Now I know how to solve this!
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|
906
|
907
|
908
|
909
|
910
Problem 910
S-tier
...and yet, I somehow managed to comprehend it. Icy, you evil genius.
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|
911
|
912
|
913
|
914
Problem 914
C-tier
Triangle-circle. I'm just glad C-tier is now the de facto F-tier. It's a better color honestly.
View Problem
|
915
|
916
|
917
Problem 917
C-tier
Did you really think I wouldn't notice Blum Blum Shub? Hmm? You're lucky I've softened up now, kiddo.
View Problem
|
918
|
919
Problem 919
C-tier
It's almost the big 2025, and integer-sided triangles are making a comeback. Huge.
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|
920
Problem 920
C-tier
Yes, yes, I know. It's the last grid. I should be more serious. But I'm genuinely getting hungry, and it's Saturday, so let's just order food.
View Problem
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|
921
Problem 921
B-tier
Pattern problem, but there's no way I'm slandering my man Fibonacci.
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|
922
|
923
|
924
|
925
Problem 925
C-tier
I also got dinner for later too, so you know I'm properly locked in now.
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|
926
|
927
|
928
|
929
Problem 929
B-tier
I don't exactly remember how to solve this, but it definitely wasn't nearly as elegant as some of the forum posts. Oh well.
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|
930
Problem 930
D-tier
D-tier because I *still* don't understand any of the first few forum posts, and I refuse to.
View Problem
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|
931
|
932
|
933
Problem 933
B-tier
My neurons are being activated, and yep, this sure is combinatorial game theory. No doubt about it.
View Problem
|
934
|
935
|
936
|
937
Problem 937
B-tier
Equiproduct is NOT a word and you can't convince me otherwise, but I'll allow it. This one's alright.
View Problem
|
938
|
939
|
940
|
|
941
|
942
|
943
|
944
Problem 944
B-tier
Okay but elevisor is not an actual word for real this time. It just isn't.
View Problem
|
945
|
946
|
947
|
948
|
949
|
950
|
|
951
|
952
|
953
Problem 953
B-tier
The unholy love child of combinatorial game theory and sublinear-number-theoretic-summation.
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|
954
|
955
Problem 955
C-tier
Triangular numbers ARE triangles, and I am STILL kind of allergic to them.
View Problem
|
956
|
957
Problem 957
S-tier
The last mental hurdle before I achieved Perfection. I finally rejoined the Project Euler Discord for some much-needed morale support after months of soloing this journey. I probably should've done that ages ago. But then again, maybe I wouldn't have been as efficient. He who travels fastest travels alone, he who travels furthest travels with others, all that jazz. But well, it's in the past now. Lesson learned, perhaps. This problem is a fierce dragon, but you know full well by now that no dragon is too big for me to tame. Even if it's geometry.
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958
|
959
|
960
|
|
961
|
962
|
963
|
964
Problem 964
A-tier
And last but not least, Probee! Looks like everyone's here, huh? I guess there's only one thing left to do...
View Problem
|
965
Problem 965
S-tier
On October 22, 2025, I completed all 965 problems on Project Euler after 2 years of pretty much nonstop grinding. I don't think I'll ever experience anything else as euphoric as seeing that big green tick for the very last time. I wrote a blog post about it and everything. I got updoots, praise, congratulations and all that... It was a great moment. This grind took up most (if not all) of my free time for a good long while. The closer I got to the end, the less it felt like a pipe dream, and the more tantalizing the finish line became. Now, was it difficult? Well no duh. Was it worth it? Eh, debatable. I don't know if the spirit of Euler himself possessed me to push through such an insane goal, but hey, it's certainly a chapter of my life that I'll look back on fondly for years to come. Though, honestly, I'm just glad I can now sit back, relax, and enjoy new Project Euler releases at a normal pace. It's what I look forward to every weekend, really.
View Problem
|
966
Problem 966
C-tier
I just completed Project Euler and now I get rewarded with geometry implementation hell? You can NOT be serious bruh :sob: :wilted_rose:
View Problem
|
967
Problem 967
B-tier
Solved this one in a hotel room just a couple hours before a programming competition. We didn't do well. No idea why.
View Problem
|
968
|
969
|
970
Problem 970
C-tier
Don't let the 'roo distract you from the fact that this is just numerical analysis, which is, in fact, for neeerds.
View Problem
|
|
971
Problem 971
B-tier
It was around this point in time that a controversy sparked in the Project Euler community over AI-assisted cheating. Things were getting spicy.
View Problem
|
972
Problem 972
B-tier
Hyperbolic geometry is a mess, and I'm glad this problem just barely scratched the surface.
View Problem
|
973
Problem 973
B-tier
Yet another pattern problem. I probably could've gotten 1st on the fastest solvers table instead of 4th if I hadn't been screwing around at the start. B for bitter, but just a little.
View Problem
|
974
|
975
|
976
|
977
Problem 977
B-tier
My mom told me to "hurry up", which was apparently all the motivation my brain needed to solve this problem. Thanks mom!
View Problem
|
978
Problem 978
A-tier
Solved this one on a plane. Live. 19th. Beat that. A for airplane, obviously.
View Problem
|
979
|
980
|
|
981
|
982
|
983
Problem 983
A-tier
I am SEEING things that weren't meant to be SEEN. What am I even SEEING
View Problem
|
984
|
985
Problem 985
C-tier
Everyone in the Discord was making fun of me because I couldn't solve this quickly ;_;
View Problem
|
986
|
987
Problem 987
C-tier
Another counting problem involving cards. I feel like I've seen this problem ten times already.
View Problem
|
988
|
989
Problem 989
A-tier
I made the horrible blunder of claiming on Discord that this problem seemed approachable. Then one of the authors HARASSED me in my DMs asking about my progress. I confidently replied that it was "standard" sublinear-number-theoretic-summation, like the simple-minded FOOL that I was. Little did I know that this was all a cunning RUSE, an attempt to HUMILIATE me. This sublinear-number-theoretic-summation wasn't even remotely STANDARD. It was oh so much WORSE. I am PATHETIC. I am a JOKE. This problem SUCKS and I freaking HATE it!!!
View Problem
|
990
|
|
991
|
992
|
993
|
994
|
995
Problem 995
C-tier
Man, I keep coming up with the most unintelligent solutions imaginable.
View Problem
|
996
|
997
Problem 997
D-tier
Lol, I genuinely got tilted solving this. D for dice box. It's actually so over for me. Unless...
View Problem
|
998
Problem 998
S-tier
Fwah! 2nd place! I did not see that coming at all. Seriously. I'd stopped caring about the fastest solvers table ever since they removed the Gold Medal achievement, and especially after they announced they'd be sunsetting the table entirely after Problem 1000. This was genuinely a pleasant surprise. I guess the best things really do come when you're not looking for them, huh? Who cares whether or not 1st place was AI slop? I simply did a thing. Fast. On an integer-sided triangle problem, of all things. My weakness. My kryptonite. My mortal enemy turned tolerable friend. And yet, against all odds, I somehow pulled it off. I don't think I could've possibly asked for a better ending. What a way to go. Unc still got it.
View Problem
|
999
Problem 999
A-tier
I hope you don't mind me using this cell as a placeholder for my rambling. Well, I mean, I've already done it dozens of times by now, so... Anyway, before we get to the big One Thousand, I want to gradually start wrapping things up with a little meta note about this tier list. Whether you read through the whole thing (god I hope you didn't) or just randomly skimmed through a few text boxes here and there, I appreciate you spending your time on this silly little blog post by this silly little boy. This "project" ended up being more of a creative writing exercise than anything else, and my god, was it way more ambitious and complex than I anticipated. All things considered, though, it was just fun (and nostalgic at times) to take a trip down my own memory lane. To watch a confused, lonely boy grow into a slightly less confused and slightly less lonely boy. I hope you yourself found some value in all of this. And with that, thank you for reading my Project Euler tier list, and... well, I guess there's just one more problem left to go, huh?
View Problem
|
1000
Problem 1000
S-tier
It's not even out yet, but I just *know* for a fact it's gonna be an INSTANT S-tier, no questions asked. Thank you to all the wonderful people involved with Project Euler: the problem-setters, the development team, the community members, and everyone in between. You've all played a meaningful part in shaping who I am today, and you've added a vibrant splash of color to the landscape I call my life. Poetic, eh? I'm such a smart boy with my smart words. Now, if you'll excuse me, I'm going to gently close this JSON file and never look at it again. 12 THOUSAND words. I am FREE. I never wanna look at a grid cell EVER AGAIN. I am SO DONE. RRRAAAAAAAAAAAAAAAHHHHH
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So… many… problems…
