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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
16410 Organizator   80 34.82
227 Ordering the Soldiers   22 1478 33.31
21
23
3273 Order statistic set   160 3451 26.91
22
20
28163 OR   11 130 22.10
20
20
7599 Optimal Strategy for the ICPC   10 21.15
839 Optimal Marks   8 862 24.73
25
34
1453 Optimal Connected Subset   159 47.19
17
28
19301 Operators (new ver)   3 47 6.88
38
17
19274 Operators   17 604 20.37
14
20
17309 Operation Bits   1 417 57.36
11
11
7934 Operating System Problems (Task Scheduling)   2 142 53.65
17
17
7742 Onotole needs your help   138 10152 41.10
4
11
36134 Ono at the river 1   1 15 18.11
17
17
10931 Online Bridge Searching   5 109 34.79
34
34
370 Ones and zeros   152 4522 30.11
19
21
13588 One X LIS   2 78 21.64
17
17
10465 One Theorem, One Year   50 43.62
28600 One Punch Man   4 70 34.27
17
17
23492 One piece   4 102 32.67
17
30
25728 One of the Simpsons symbols   2 287 67.24
5
13
27308 One more weird game   10 402 55.38
3
8
2023 One Instruction Computer Simulator   47 10.58
42
42
15091 One Good Base Deserves Another   3 28.57
34
1
2901 One Geometry Problem   9 1827 36.14
4
13
36423 One Eight_Nine   3 197 36.11
3
9
23516 One day with string   10 238 36.45
7
10
1465 On the Way to Find Chris   2 62 15.35
23
23
16275 On the side of the road   2 85 21.63
34
26
15631 On the Plus Side   4 43 32.26
12
17
8820 Okret   4 51 21.61
38
34
3007 Oil Company   3 178 25.08
23
28
27098 Oil   1 88 26.84
17
34
1697 Ohgas' Fortune   4 715 64.53
9
4
21394 Ohani And The Series   4 605 42.18
17
17
25214 Ohani And The Game   81 19.43
11
8
21395 Ohani And Binary Search Tree   -1 130 36.05
50
17
23737 Ogledala   1 54 37.50
34
17
293 Officers on the Beat   11 16.23
18469 Office Mates   1 53 32.46
17
34
3107 Odd Numbers of Divisors   27 1072 18.44
22
22
6977 Odd Independent Sets   17 51.28
10820 Obsession   4 39 24.38
39
39
6172 OAE   7 1230 42.03
12
26
19297 Nymphs from H10   36 35.65
94 Numeral System of the Maya   4 2599 40.57
10
6
1699 Numeral System   13 2248 67.37
6
3
11202 Number Theory   37 31.44
39
39
1112 Number Steps   84 34157 43.03
4
4
27317 Number of score sequences   8 84 48.54
14
19
411 Number of quite different words   4 244 33.93
17
27

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