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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
18467 A Brief Expedition   11 277 54.42
15
15
7555 A - Crazy Rows   2 186 25.98
17
21
6690 A - Comparison Expressions   57 33.22
1296 4 values whose sum is 0   64 5121 24.92
18
14
1448 3D Cover   3 100 27.12
28
17
11180 369 Numbers   19 899 12.76
25
23
21407 2x2 Subgrid Sum Problem (medium)   1 22 21.29
21409 2x2 Subgrid Sum Problem (generalized)   1 6 17.02
9721 2s Complement   1 179 32.17
34
34
27301 2D arrays with XOR property   4 18 32.00
23
39
9511 24-Puzzle   24 17.76
24999 1807   10 529 38.42
15
18
5725 123 Sequence   2 124 24.09
1
1
9952 111…1 Squared   8 1793 46.40
5
10
381 106 miles to Chicago   50 3222 36.51
15
14
19971 100pct failure in 72 hours   1 8 42.86
17
50
10676 0110SS   26 1772 41.09
13
9
1451 01 Sequence   1 99 28.63
9
26
3973 0 0 Pairs   4 806 27.34
15
15
41455 ....   1 11 14.55
17
17
2140 (un)Fair Play   75 38.08
4302 (K,N)-Knight   3 315 25.20
14
24
4227 "Shortest" pair of paths   3 214 41.11
23
17
34229 "Operation - Modulo"   19 956 19.50
2
16

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