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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
3385 Yoda Goes Palindromic !   3 586 30.53
17
17
3393 Knot or Not   10 16.67
3394 Lagrange’s Four-Square Theorem   4 532 46.08
1
9
3412 Higgs Boson   52 19.09
3442 The last digit   190 30120 26.99
9
8
3464 Clock   3 66 36.47
34
9
3466 Another Longest Common Subsequence Problem   6 5.66
3543 Matrica   56 39.90
3544 Binary Search Tree   6 611 21.01
11
20
3545 Najkraci   6 188 28.92
28
34
3591 Patting Heads   3 659 35.33
17
17
3723 Snooker   5 460 50.55
9
27
3749 Subset Sums   74 4224 26.66
17
20
3752 JEDNAKOST   12 601 18.45
23
21
3763 George   15 528 52.53
19
18
3791 Street   8 669 51.43
10
13
3898 Even Palindrome   -1 251 10.23
3946 K-th Number   245 5836 35.43
25
27
3953 Paid Roads   8 261 27.57
19
26
3961 Journey with Pigs   133 41.31
3962 ELEVATOR II   2 101 43.31
9
26
3977 Police Query   8 302 17.37
27
30
4070 Two Professors   104 14.10
4103 Extend to Palindrome   44 2590 30.58
16
17
4110 Fast Maximum Flow   48 3061 34.31
25
22
4157 Domino   4 56 49.80
42
42
4164 A conjecture of Paul ErdÅ‘s   25 2692 43.78
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 24.16
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
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 2092 29.48
22
19
4421 Irreducible polynomials over GF2   64 18.04
4458 Rainbow   2 38 19.53
34
42
4487 Can you answer these queries VI   27 1365 23.61
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
4785 Starship   16 31.25
4828 ZSequence   53 18.02
5163 Tower of Vientiane   105 34.94
5182 Double Sorting   15 8.70

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