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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
1728 Common Permutation   26 4201 46.71
6
6
9032 Cube Free Numbers   66 4167 31.77
12
11
1435 Vertex Cover   129 4159 34.36
15
18
1837 Pie   60 4130 30.44
18
15
66 Cross-country   38 4115 64.54
11
12
9722 Insertion Sort   28 4072 31.43
12
12
10798 Wachovia Bank   59 4065 46.73
7
8
10500 Haybale stacking   24 4040 34.75
9
14
6297 Decipher   -1 4008 44.70
8
6
1684 Frequent values   112 3997 27.66
20
21
5971 LCM Sum   83 3959 26.33
20
29
3921 The Great Ball   60 3950 39.19
7
11
10442 Candy Distribution   22 3931 37.55
2
4
181 Scuba diver   99 3911 26.08
18
18
705 New Distinct Substrings   42 3895 26.82
26
25
63 Square Brackets   92 3891 56.76
14
18
17247 Digit Sum   54 3885 37.90
18
22
11373 Coke madness   37 3879 35.07
5
8
18164 Atoms in the Lab   32 3844 25.79
8
5
339 Recursive Sequence   79 3840 50.29
20
17
30 Bytelandian Blingors Network   54 3791 39.26
14
10
1710 Two Ends   115 3790 41.56
18
17
2416 Distinct Subsequences   94 3783 36.34
12
22
7299 Multiples of 3   121 3781 23.63
20
17
5295 Adjacent Bit Counts   86 3776 63.98
14
18
12448 How Many Games?   53 3759 22.36
14
12
8611 Non-Decreasing Digits   71 3733 54.84
7
11
5976 Traversing Grid   30 3721 58.56
6
10
4942 Integer Factorization (15 digits)   45 3695 32.76
11
11
2149 Biased Standings   21 3678 33.66
5
5
7185 Bye Bye Cakes   17 3669 38.67
8
7
29 Hash it!   14 3650 24.17
14
8
237 Sums in a Triangle   -13 3593 42.51
28
10
4343 Empty Boxes   26 3582 65.99
2
13
6294 Yodaness Level   74 3574 49.30
15
16
1029 Matrix Summation   53 3559 20.15
15
18
10707 Count on a tree II   70 3555 19.61
31
30
16 Sphere in a tetrahedron   12 3552 55.22
11
16
3934 Recaman’s Sequence   25 3536 53.87
9
6
1811 Longest Common Substring   37 3531 22.38
20
19
6694 D - Playing with Marbles   18 3504 66.68
3
5
10283 ALL IZZ WELL   70 3493 31.36
17
14
5917 Factorial length   11 3478 34.57
5
17
48 Glass Beads   29 3476 38.07
15
18
11772 Negative Score   67 3451 34.17
10
11
154 Sweet and Sour Rock   80 3450 51.16
14
17
3273 Order statistic set   160 3450 26.91
22
20
130 Rent your airplane and make money   88 3387 28.64
18
17
1161 Tic-Tac-Toe ( I )   20 3383 22.85
12
11
13753 Amazing Prime Sequence   62 3362 29.93
10
12

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