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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
3749 Subset Sums   74 4188 26.58
17
20
9032 Cube Free Numbers   65 4162 31.75
12
11
1435 Vertex Cover   129 4141 34.32
15
18
66 Cross-country   38 4107 64.52
11
12
1837 Pie   60 4089 30.41
18
15
9722 Insertion Sort   28 4050 31.39
12
12
10798 Wachovia Bank   59 4032 46.80
7
8
6297 Decipher   -1 4005 44.70
8
6
10500 Haybale stacking   24 3961 34.54
9
14
1684 Frequent values   112 3954 27.61
20
21
3921 The Great Ball   60 3947 39.18
7
11
10442 Candy Distribution   22 3927 37.56
2
4
5971 LCM Sum   81 3894 26.18
20
29
181 Scuba diver   99 3889 26.04
18
18
63 Square Brackets   92 3877 56.70
14
18
11373 Coke madness   37 3875 35.06
5
8
705 New Distinct Substrings   42 3849 26.73
26
25
18164 Atoms in the Lab   32 3841 25.79
8
5
339 Recursive Sequence   79 3802 50.23
20
17
1710 Two Ends   115 3783 41.57
18
17
30 Bytelandian Blingors Network   54 3779 39.24
14
10
2416 Distinct Subsequences   94 3767 36.30
12
22
7299 Multiples of 3   121 3761 23.58
20
17
12448 How Many Games?   53 3754 22.35
14
12
17247 Digit Sum   54 3749 37.49
18
22
5295 Adjacent Bit Counts   86 3742 64.27
14
18
8611 Non-Decreasing Digits   71 3728 54.82
7
11
5976 Traversing Grid   30 3719 58.55
6
10
7185 Bye Bye Cakes   17 3666 38.66
8
7
2149 Biased Standings   21 3657 33.62
5
5
29 Hash it!   14 3643 24.15
14
8
4942 Integer Factorization (15 digits)   45 3637 32.68
11
11
237 Sums in a Triangle   -13 3589 42.48
28
10
4343 Empty Boxes   26 3578 66.00
2
13
6294 Yodaness Level   74 3568 49.30
15
16
16 Sphere in a tetrahedron   12 3540 55.33
11
16
3934 Recaman’s Sequence   25 3535 53.87
9
6
1029 Matrix Summation   53 3533 20.12
15
18
6694 D - Playing with Marbles   18 3504 66.71
3
5
10707 Count on a tree II   69 3490 19.52
31
30
10283 ALL IZZ WELL   70 3487 31.37
17
14
5917 Factorial length   11 3474 34.55
5
17
1811 Longest Common Substring   36 3461 22.23
20
19
48 Glass Beads   29 3458 38.01
15
18
154 Sweet and Sour Rock   80 3439 51.17
14
17
11772 Negative Score   67 3438 34.17
10
11
3273 Order statistic set   160 3390 26.58
22
20
130 Rent your airplane and make money   88 3381 28.65
18
17
1161 Tic-Tac-Toe ( I )   20 3367 22.84
12
11
13753 Amazing Prime Sequence   61 3356 29.91
11
12

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