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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
2901 One Geometry Problem   9 1827 36.14
4
13
15091 One Good Base Deserves Another   3 28.57
34
1
2023 One Instruction Computer Simulator   47 10.58
42
42
27308 One more weird game   10 402 55.38
3
8
25728 One of the Simpsons symbols   2 287 67.24
5
13
23492 One piece   4 102 32.67
17
30
28600 One Punch Man   4 70 34.27
17
17
10465 One Theorem, One Year   50 43.62
13588 One X LIS   2 79 21.76
17
17
370 Ones and zeros   152 4522 30.11
19
21
10931 Online Bridge Searching   5 109 34.68
34
34
36134 Ono at the river 1   1 15 18.11
17
17
7742 Onotole needs your help   138 10153 41.10
4
11
7934 Operating System Problems (Task Scheduling)   2 142 53.65
17
17
17309 Operation Bits   1 417 57.36
11
11
19274 Operators   17 605 20.36
14
20
19301 Operators (new ver)   3 47 6.88
38
17
1453 Optimal Connected Subset   159 47.19
17
28
839 Optimal Marks   8 862 24.73
25
34
7599 Optimal Strategy for the ICPC   10 21.15
28163 OR   11 130 22.10
20
20
3273 Order statistic set   160 3456 26.92
22
20
227 Ordering the Soldiers   22 1478 33.31
21
23
16410 Organizator   80 34.82
1267 Origin of Life   41 25.10
34
1
4155 OTOCI   2 512 45.42
26
34
3426 Ouroboros Snake   2 86 52.26
26
34
1468 Outside it is now raining   32 23.33
34
17
2318 Overlapping Words   90 22.40
23930 Overlapping Words   3 28 24.16
17
17
16214 Pabbu-pneumonia   3 59 25.61
17
26
11963 Packing Rectangles   40 51.65
3953 Paid Roads   8 261 27.57
19
26
1270 Paint By Numbers   28 23.24
9504 Paint on a Wall   1 26 42.31
34
26
174 Paint templates   1 60 38.04
9
17
2962 Painting Blocks (Act I)   113 57.95
2963 Painting Blocks (Act II)   1 61 21.28
17
34
27380 Painting Hat   6 257 47.56
11
12
19490 Pair and unpair weightest string   2 84 47.33
9
17
26561 Pair Divisible 2   2 20 10.26
42
42
682 Pairs of Integers   208 25.08
1
1
17150 Palin Square   6 116 31.96
21
30
7150 Palindrome 2000   57 3304 27.64
14
14
25892 Palindrome in a Tree   8 155 35.99
17
13
34617 Palindrome Lover   2 179 25.25
3
3
34025 Palindrome Maker   5 83 58.22
12
17
21085 Palindrome Merge   1 35 28.24
17
17
25854 Palindrome Or Not   11 339 16.57
12
8
2426 Palindromes   10 1026 24.80
16
15

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