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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
38602 Unique Sequence   8 73 46.49
8
12
10608 Unique Strings   3 71 48.70
26
26
695 Unite Fast   1 138 27.81
9
9
9690 Universal Question Answering System   26 24.00
31502 University Homework   5 56 29.11
20
6
10809 Unlock it !   86 30.27
11440 Unlock it ! Part 2   48 22.88
9517 Unlock the Cellphone   12 23.64
2709 Untitled Problem   30 16.67
2940 Untitled Problem II   126 15.45
34
1031 Up Subsequence   2 734 32.60
15
10
15914 Update Sub-Matrix & Query Sub-Matrix   2 97 36.11
23
28
16487 Update the array !   165 5027 38.77
9
14
7859 Upper Right King (Hard)   3 171 37.39
26
34
31970 Urdhva - Tiryag Bhyam   -6 86 31.10
1
1
28653 Urinals   5 13 11.89
26
17
1440 Use of Function Arctan   4 543 29.24
5
26
389 Use of Hospital Facilities   1 53 15.47
34
26
18966 Vacation Planning   3 142 25.94
17
17
15438 Valences   11 1281 41.62
4
7
35381 VALENTINE   2 42 27.50
11
14
22560 Valid Path   6 67 35.74
6
8
11516 VALIDATE THE MAZE   64 3184 32.23
11
8
10416 Van Helsings gun   3 1445 54.45
6
15
410 Variable Radix Huffman Encoding   1 180 19.26
1
1
29367 VEGETABLE SHOPKEEPER 3   6 111 40.70
15
15
15827 Vending Machine   2 36 8.81
6
17
10958 Vero Dominoes   3 419 45.30
1
23
1435 Vertex Cover   129 4159 34.36
15
18
9689 Very Boring Homework   16 33.33
235 Very Fast Multiplication   25 1362 28.09
25
21
18457 Very Friends   6 250 28.02
11
30
18458 Very Friends 2   4 40 19.45
23
23
3306 Very Special Boxes   114 31.96
9
26
10502 Video game combos   1 398 38.32
34
17
28601 Village Fair   5 118 18.71
21
24
42526 Village Unity   1 7 10.81
8916 Villages by the River   7 279 24.41
13
20
19149 Virus Revisited   2 94 28.65
1
17
7001 Visible Lattice Points   1 563 30.21
17
34
13031 Vision Field   28 24.04
34
34
23925 Vitaliy and Pie   12 618 42.21
10
7
2899 Volunteers   60 45.00
17
34
224 Vonny and her dominos   6 692 51.85
8
8
122 Voracious Steve   2 275 29.95
23
23
27498 Votka and String   3 83 33.53
26
21
10711 VUK   6 200 54.47
20
23
20689 WA,RTE and Placements   1 28 41.08
34
34
10798 Wachovia Bank   59 4065 46.73
7
8
32259 Walk home together   1 41 10.03
17
17

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