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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
7676 Sum of Digits   105 4837 38.51
17
20
7680 Electrical Engineering   16 34.64
7685 Flowers   4 309 30.16
15
24
7692 Chemistry   69 13.87
7693 Environmental Engineering   11 23.95
7696 Encryption   3 979 35.98
17
17
7704 Civil Engineering   1 634 44.67
9
26
7709 Jumping Zippy   3 64 55.34
26
34
7718 Number of common divisors   86 6957 24.80
12
13
7733 Happy Numbers I   89 9367 53.38
8
8
7734 Twist and whirl - want to cheat   8 237 45.34
24
17
7737 Escape   54 33.70
7739 Sound   12 460 33.09
20
17
7740 Fence   19 29.23
7741 Sequence   7 802 30.23
11
23
7742 Onotole needs your help   138 10089 41.02
4
11
7745 Bingo!   749 38.70
17
1
7746 Cocircular Points   59 16.57
42
17
7753 Happy Numbers II   3 647 15.91
23
17
7757 Flowers Flourish from France   12 3158 53.04
7
2
7758 Growing Strings   173 31.84
7759 Hyperactive Girl   1 106 39.75
26
26
7760 Kids’ Wishes   1 92 31.74
34
1
7761 Jollo   3 394 39.98
17
9
7762 Electric Needs   1 23 41.30
34
17
7763 Ingenious Metro   66 67.09
7772 Help a researcher   55 46.99
7777 National Treasure   32 38.30
7778 Land Division   1 35 43.21
17
17
7779 Stock Chase   71 29.55
17
17
7782 Largest Labeled Common Ancestor   1 204 61.73
7783 Commuting Functions   44 25.22
7804 Defense of a Kingdom   39 4974 25.24
10
12
7805 Kitchen Robot   3 88 31.90
9
9
7807 The Lucky Prisoner   27 9.93
7809 Cow Photographs   2 168 35.60
26
26
7826 Tree Isomorphism   8 540 22.87
19
28
7851 Stacks of Zippy   1 17 16.80
34
34
7857 Tower Game (Hard)   59 15.07
34
34
7859 Upper Right King (Hard)   3 165 36.85
26
34
7860 Deal or No Deal   1 9 42.55
7861 UFO   1 34 29.24
17
17
7862 Prisoner of Benda   23 34.25
7864 Four Chips (Hard)   6 138 30.34
31
17
7866 Regular expressions (Hard)   1 96 25.00
28
23
7868 Join   1 17 47.56
34
17
7870 Invisible point   17 1657 42.84
4
18
7874 Calculator   25 22.30
7875 Miles and kilometers   6 603 46.82
9
9
7881 Ljutnja   3 637 24.24
34
21

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