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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
40672 Where Proofless Assumption Fails   4 70 42.61
9
9
40945 Internet Spamming   4 26 27.74
17
17
40982 Teleporters and Gems II   4 35 19.52
9
1
41128 Pierwiastkowanie   4 40 39.50
5
13
42340 Bracket Check   4 262 32.97
3
1
42535 Hugo"s Tennis Training   4 46 48.54
1
5
44 Substitution Cipher   3 341 13.83
17
17
55 Jasiek   3 479 28.39
21
13
58 Crime at Piccadily Circus   3 651 14.03
31
21
60 The Gordian Dance   3 238 39.74
12
45
71 Tree   3 465 28.80
12
9
90 Minimizing maximizer   3 389 24.84
17
26
98 Dance Floor   3 727 40.34
12
12
105 Alice and Bob   3 179 26.74
42
42
106 Binary Stirling Numbers   3 2693 37.10
4
17
148 Land for Motorways   3 215 41.02
17
21
149 Fencing in the Sheep   3 102 12.99
34
17
260 Containers   3 298 46.22
17
14
287 Smart Network Administrator   3 458 23.71
23
28
344 Poker   3 900 37.66
17
9
395 Anti-prime Sequences   3 349 47.83
9
9
397 I Conduit   3 196 15.56
21
21
685 Partition the sequence   3 244 21.17
21
30
744 Longest Permutation   3 619 19.85
15
19
869 Galactic Import   3 142 45.76
5
5
871 Letter Sequence Analysis   3 108 43.03
17
6
904 Image Perimeters   3 335 59.38
17
17
967 Parking Bay   3 565 48.93
12
23
1003 Little Quilt   3 171 39.89
21
11
1268 CN Tower (Easy)   3 1123 30.75
8
6
1448 3D Cover   3 100 27.12
28
17
1461 Greedy Hydra   3 196 33.33
27
30
1470 Another Sequence Problem   3 197 24.56
42
26
1475 Play with Digit Seven   3 136 38.22
28
12
1553 Backup Files   3 997 21.52
17
34
1723 Bee Maja   3 561 53.62
17
21
1776 DNA Laboratory   3 112 11.02
30
21
1802 Edge   3 420 59.75
5
9
1843 Leonardo Notebook   3 382 34.85
17
34
2138 Pibonacci   3 48 14.11
26
39
2139 Gossipers   3 602 31.76
21
26
2175 Emoticons   3 332 22.00
23
28
2525 Encoding   3 752 29.15
12
12
2527 Flipping Burned Pancakes   3 265 52.59
17
17
2715 Glasnici   3 349 37.40
26
30
3007 Oil Company   3 178 25.08
23
28
3023 Binary multiplication   3 229 25.04
17
17
3106 Dictionary Subsequences   3 171 18.58
17
17
3110 Palindromic Number   3 102 21.22
9
17
3111 Stabards   3 166 43.65
12
23

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