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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
1 Life, the Universe, and Everything   295 212823 33.01
4
3
2 Prime Generator   620 78064 15.97
15
13
5 The Next Palindrome   451 19903 10.74
25
18
12 The Game of Master-Mind   1 737 49.04
17
17
13 Hotline   2 193 16.48
34
23
14 I-Keyboard   6 1257 43.52
24
23
15 The Shortest Path   156 7451 24.14
17
12
24 Small factorials   153 49247 29.70
15
9
31 Fast Multiplication   48 8599 20.63
15
12
32 A Needle in the Haystack   192 10799 38.17
15
13
34 Run Away   2 466 21.90
26
34
35 Equipment Box   6 1294 14.64
7
20
36 Secret Code   6 534 36.63
17
17
37 The Proper Key   1 135 15.63
17
17
38 Labyrinth   97 5278 25.74
17
16
39 Piggy-Bank   139 8061 35.45
14
16
40 Lifting the Stone   6 1590 23.51
13
16
41 Play on Words   42 3199 19.38
21
24
42 Adding Reversed Numbers   103 75752 48.42
6
4
43 Copying Books   44 2710 25.57
19
19
44 Substitution Cipher   2 318 13.48
17
17
47 Skyscraper Floors   5 280 12.63
26
17
49 Hares and Foxes   1 106 8.06
17
26
50 Invitation Cards   29 1710 43.05
16
18
51 Fake tournament   42 1786 27.35
18
19
55 Jasiek   3 460 28.20
21
13
56 Dyzio   8 1205 31.52
11
14
57 Supernumbers in a permutation   20 983 32.09
17
19
58 Crime at Piccadily Circus   3 635 13.90
31
21
60 The Gordian Dance   3 206 39.08
12
45
63 Square Brackets   92 3834 56.90
14
18
64 Permutations   98 4266 51.96
12
20
65 Ball   2 148 35.08
17
23
66 Cross-country   38 4052 64.52
11
12
67 Cutting out   2 285 42.20
30
27
68 Expression   158 30.57
1
34
69 Moulds   2 128 35.36
12
12
70 Relations   1 244 27.22
1
1
83 Bundling   1 47 37.96
17
17
84 Shortcut   1 230 31.55
17
9
86 November Rain   4 291 17.44
21
21
87 Football   57 21.31
17
1
89 Hang or not to hang   1 61 19.26
17
17
90 Minimizing maximizer   3 364 24.93
17
26
91 Two squares or not two squares   78 5994 24.54
11
14
92 Cutting off Squares   -1 247 42.38
1
1
96 Shopping   45 3034 44.25
15
11
97 Party Schedule   250 8788 36.11
14
16
98 Dance Floor   3 711 40.28
12
12
99 Bus   180 21.86
34
17

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