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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
7299 Multiples of 3   121 3782 23.64
20
17
2416 Distinct Subsequences   94 3783 36.34
12
22
1710 Two Ends   115 3790 41.56
18
17
30 Bytelandian Blingors Network   54 3791 39.26
14
10
339 Recursive Sequence   79 3840 50.29
20
17
18164 Atoms in the Lab   32 3844 25.79
8
5
11373 Coke madness   37 3879 35.07
5
8
17247 Digit Sum   54 3886 37.91
18
22
63 Square Brackets   92 3892 56.76
14
18
705 New Distinct Substrings   42 3897 26.82
26
25
181 Scuba diver   99 3911 26.08
18
18
10442 Candy Distribution   22 3931 37.55
2
4
3921 The Great Ball   60 3951 39.19
7
11
5971 LCM Sum   83 3961 26.34
20
29
1684 Frequent values   112 3997 27.66
20
21
6297 Decipher   -1 4008 44.70
8
6
10500 Haybale stacking   24 4042 34.76
9
14
10798 Wachovia Bank   59 4065 46.73
7
8
9722 Insertion Sort   28 4076 31.43
12
12
66 Cross-country   38 4115 64.54
11
12
1837 Pie   60 4131 30.45
18
15
1435 Vertex Cover   129 4159 34.36
15
18
9032 Cube Free Numbers   66 4167 31.77
12
11
1728 Common Permutation   26 4201 46.71
6
6
3749 Subset Sums   74 4224 26.66
17
20
9655 Elevator Trouble   96 4335 32.41
11
11
2713 Can you answer these queries IV   60 4387 17.75
21
21
1786 In Danger   49 4395 53.61
7
13
8319 GLJIVE   -85 4406 35.24
2
5
64 Permutations   98 4413 52.19
12
20
10401 Aliens at the train   85 4483 29.27
13
10
3381 Highways   77 4517 38.26
10
9
8 Complete the Sequence!   32 4521 36.74
16
18
370 Ones and zeros   152 4522 30.11
19
21
2738 Number Guessing Game   42 4631 62.52
8
13
7259 Light Switching   102 4699 34.34
16
15
18155 abs(a-b) I   61 4700 47.91
5
9
14956 Submerging Islands   107 4727 39.71
13
14
913 Query on a tree II   118 4786 20.97
23
21
423 Assignments   244 4838 33.69
18
22
7975 Tri graphs   87 4871 29.13
11
10
16487 Update the array !   165 5027 38.77
9
14
7676 Sum of Digits   106 5038 38.80
17
20
2905 Not a Triangle   93 5052 38.67
11
11
21524 Pattern Find   81 5062 38.72
10
13
10565 Alice Sieve   31 5079 53.39
2
7
1296 4 values whose sum is 0   64 5121 24.92
18
14
7804 Defense of a Kingdom   41 5232 25.17
10
12
16420 Even Numbers   40 5279 48.05
6
5
10380 prayatna PR   86 5303 43.08
6
6

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