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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
4164 A conjecture of Paul ErdÅ‘s   25 2698 43.76
16
14
4166 Four colors   2 104 22.01
42
42
4168 Square-free integers   14 788 46.27
16
21
4172 Multiplicative digital root   1 77 24.07
4176 A Knightly Pursuit   2 67 29.28
26
17
4177 Herding   57 2731 35.22
14
15
4179 Temptation Island   2 655 45.09
20
12
4180 Pizza Location   2 577 18.60
31
17
4182 Candy (Again)   2 236 18.78
34
34
4186 Break a New RSA system   1 138 34.12
4188 Amazing equality   43 14.08
4189 Landing   1 8 4.08
50
50
4198 Lego   5 195 25.35
24
22
4206 Fast Maximum Matching   33 2094 29.48
22
19
4309 Circular game   35 19.60
4421 Irreducible polynomials over GF2   64 18.04
4452 Simple Arithmetics II   55 7514 42.29
11
5
4458 Rainbow   2 38 19.53
34
42
4461 A Famous Airport Manager   27 17.18
4487 Can you answer these queries VI   27 1367 23.62
34
28
4523 Binomial Coefficients   210 41.58
23
12
4525 Digger Octaves   6 391 35.55
17
21
4528 Frog Wrestling   69 37.50
4761 Strategy game   2 44 55.64
9
17
4784 Diophantine equation   3 155 40.59
26
17
4828 ZSequence   53 18.02
5093 Pretty Functions   1 43 22.67
5120 Minimal Possible String   4 61 5.32
34
30
5157 Game Simulator   1 23 8.99
50
17
5163 Tower of Vientiane   105 34.94
5182 Double Sorting   15 8.70
5446 Fishing Net   176 31.96
5449 Seinfeld   189 9560 40.07
8
11
5453 Air Strike   2 178 23.78
17
17
5511 Heavy Sequences   -1 84 18.41
34
34
5541 Sequoiadendron   1 66 44.25
17
17
5609 Knight Moves   6 107 40.69
9
20
5649 Divide Polygon   3 48 22.95
9
34
5911 Square-free Integers Factorization   1 20 30.67
17
34
5917 Factorial length   11 3478 34.57
5
17
5970 Finding Primes   22 1345 27.95
16
15
5971 LCM Sum   83 3961 26.34
20
29
5973 Selecting Teams   235 23.33
6169 Standing Sequence   2 122 28.60
34
39
6170 Homecoming   1 32 30.77
17
34
6171 Majority   35 5349 43.19
6
7
6172 OAE   7 1230 42.03
12
26
6221 Increasing Powers of K   4 360 27.59
24
34
6230 Dictionary order   6 9.30
6236 Matches   8 458 22.10
26
7

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