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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
10111 Nonnegative Partial Sums   15 534 30.05
19
19
22343 Norma   2 270 29.04
34
17
8106 Normalized Form   6 278 36.76
17
17
11473 NOS   2 188 26.28
1
50
2905 Not a Triangle   93 5052 38.67
11
11
36668 Not So Blind Escape   2 10 30.12
34
42
5451 Not So Flat After All   9 1128 42.94
11
10
86 November Rain   4 301 17.60
21
21
12321 NSquare Sum ( Easy )   3 95 60.22
1
13
12322 NSquare Sum ( Medium )   64 35.65
30
21
33777 NT Games   12 77 41.92
19
23
32724 nth number   4 644 24.63
12
11
25024 Nth Prime   7 114 17.33
34
39
12056 Nubulsa Expo   9 8.57
1810 Nuclear Plants   22 11.90
17
17
7260 Number Game   1 94 26.01
17
17
2738 Number Guessing Game   42 4631 62.52
8
13
8991 Number Guessing Game 2   3 132 35.60
17
42
2125 Number Labyrinth   2 64 25.55
17
17
15996 Number Magic II   27 26.28
26
17
27313 Number of Binary Trees   6 81 45.96
17
26
7718 Number of common divisors   87 7297 24.45
11
13
7586 Number of Palindromes   9 1426 46.68
13
13
8277 Number of Prime Strings   3 112 19.95
23
28
411 Number of quite different words   4 244 33.93
17
27
27317 Number of score sequences   8 84 48.54
14
19
1112 Number Steps   84 34157 43.03
4
4
11202 Number Theory   37 31.44
39
39
1699 Numeral System   13 2248 67.37
6
3
94 Numeral System of the Maya   4 2599 40.57
10
6
19297 Nymphs from H10   36 35.65
6172 OAE   7 1230 42.03
12
26
10820 Obsession   4 39 24.38
39
39
6977 Odd Independent Sets   17 51.28
3107 Odd Numbers of Divisors   27 1072 18.44
22
22
18469 Office Mates   1 53 32.46
17
34
293 Officers on the Beat   11 16.23
23737 Ogledala   1 54 37.50
34
17
21395 Ohani And Binary Search Tree   -1 130 36.05
50
17
25214 Ohani And The Game   81 19.43
11
8
21394 Ohani And The Series   4 605 42.18
17
17
1697 Ohgas' Fortune   4 715 64.53
9
4
27098 Oil   1 88 26.84
17
34
3007 Oil Company   3 178 25.08
23
28
8820 Okret   4 51 21.61
38
34
15631 On the Plus Side   4 43 32.26
12
17
16275 On the side of the road   2 85 21.63
34
26
1465 On the Way to Find Chris   2 62 15.35
23
23
23516 One day with string   10 238 36.45
7
10
36423 One Eight_Nine   3 197 36.11
3
9

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