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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
7870 Invisible point   17 1671 42.96
4
18
7868 Join   1 20 46.74
34
17
7866 Regular expressions (Hard)   1 140 27.33
28
23
7864 Four Chips (Hard)   6 167 30.31
31
17
7862 Prisoner of Benda   27 25.83
7861 UFO   1 41 30.21
17
17
7860 Deal or No Deal   1 13 30.77
7859 Upper Right King (Hard)   3 171 37.39
26
34
7857 Tower Game (Hard)   62 14.63
34
34
7851 Stacks of Zippy   1 19 16.41
34
34
7826 Tree Isomorphism   10 620 23.65
19
27
7809 Cow Photographs   2 173 36.01
26
26
7807 The Lucky Prisoner   27 9.84
7805 Kitchen Robot   3 90 32.24
9
9
7804 Defense of a Kingdom   41 5227 25.17
10
12
7783 Commuting Functions   49 25.94
7782 Largest Labeled Common Ancestor   1 208 57.44
7779 Stock Chase   76 30.19
17
17
7778 Land Division   1 40 43.50
17
17
7777 National Treasure   35 31.50
7772 Help a researcher   62 48.95
7763 Ingenious Metro   83 67.02
7762 Electric Needs   1 25 38.00
34
17
7761 Jollo   3 398 40.15
17
9
7760 Kids’ Wishes   1 95 31.93
34
1
7759 Hyperactive Girl   1 111 39.94
26
26
7758 Growing Strings   176 32.39
7757 Flowers Flourish from France   12 3175 53.09
7
2
7753 Happy Numbers II   3 651 15.95
23
17
7746 Cocircular Points   63 16.78
42
17
7745 Bingo!   758 38.89
17
1
7742 Onotole needs your help   138 10152 41.10
4
11
7741 Sequence   7 814 30.33
11
23
7740 Fence   23 25.49
7739 Sound   12 485 33.86
20
17
7737 Escape   57 34.36
7734 Twist and whirl - want to cheat   8 245 45.51
24
17
7733 Happy Numbers I   89 9403 53.36
8
8
7718 Number of common divisors   87 7293 24.45
11
13
7709 Jumping Zippy   3 68 54.35
26
34
7704 Civil Engineering   1 640 44.59
9
26
7696 Encryption   3 1003 35.87
17
17
7693 Environmental Engineering   38 39.23
7692 Chemistry   72 13.88
7691 Homo or Hetero   22 1676 36.26
15
11
7685 Flowers   4 352 32.98
13
26
7683 Powered and Squared   8 717 27.21
19
16
7680 Electrical Engineering   17 33.97
7676 Sum of Digits   106 5034 38.79
17
20
7668 Pebble Solver   15 2009 50.46
8
11

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