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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
82 Easy Problem   4 508 34.70
17
9
30735 Ada and Island   18 628 34.70
13
12
8594 Tails all the way   293 34.63
598 Increasing Subsequences   148 34.62
34
34
9935 Break the Chocolate   16 1659 34.62
4
17
9382 Complan Carnival   41 34.62
21615 Playing with GCD   21 1035 34.61
12
14
25158 Star   15 314 34.60
12
19
5917 Factorial length   11 3478 34.57
5
17
29431 Counting WOW-Substrings   12 149 34.56
10
17
4311 Quasi-template   62 34.52
6408 Counting Triangles 2   -1 66 34.52
50
50
33263 Ada and Tomel   3 42 34.51
28
28
9587 The Prime conjecture   5 574 34.49
9
9
27303 Count Doubles   3 629 34.48
7
5
9934 Alice and Bob   1 163 34.48
9
34
19545 Black and White beads   1 248 34.47
26
26
12236 Cloud Computing   39 34.46
30893 Sabbir and Game   14 810 34.45
5
8
21061 Yet Another Subset Sum Problem   2 48 34.44
50
50
17394 Bits Game   50 34.44
1
34
735 Minimum Diameter Spanning Tree   1 199 34.41
17
30
23861 Fingerprints   -4 269 34.41
6
3
376 A concrete simulation   15 1735 34.38
11
12
1435 Vertex Cover   129 4159 34.36
15
18
10582 subarrays   215 9569 34.36
11
13
32899 Mean of array   20 236 34.36
15
18
7737 Escape   57 34.36
2450 Counting Rabbits   9 1240 34.35
10
12
7259 Light Switching   102 4699 34.34
16
15
4110 Fast Maximum Flow   48 3061 34.32
25
22
8335 Counting the teams   1 30 34.31
34
50
33019 Catering Contracts   7 93 34.31
23
27
24258 Fata7y Ya Warda!   14 145 34.30
20
17
31280 Ada and Zoo   1 36 34.29
17
34
11374 Database   11 2101 34.28
6
6
28600 One Punch Man   4 70 34.27
17
17
408 Jill Rides Again   2 971 34.26
9
9
1963 Image Projections   109 34.26
1702 Cleaning Robot   45 1593 34.22
27
19
3388 Double Near Palindromes   1 456 34.21
17
17
32857 Angry Siam   4 62 34.21
30
30
36387 Honest Rectangle   1 23 34.19
17
34
184 Automatic Teller Machines   1 212 34.19
1
1
28462 New TAP   1 40 34.18
17
17
11772 Negative Score   67 3451 34.17
10
11
3639 Lucky Numbers   7 733 34.15
13
9
4273 Train TimeTable   7 426 34.14
14
8
20849 Interesting queries   3 46 34.12
34
34
4186 Break a New RSA system   1 138 34.12

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