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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
2171 Ambiguous Codes   1 63 34.57
19975 Amazing Prime Sequence (hard)   5 80 41.73
39
45
13753 Amazing Prime Sequence   61 3303 29.76
11
12
11472 Amazing Maze   5 261 29.01
17
26
14168 Amazing Factor Sequence (medium)   9 200 29.00
21
24
33039 Amazing Factor Sequence (hard)   2 17 61.72
50
50
14138 Amazing Factor Sequence   37 2316 37.03
11
11
4188 Amazing equality   38 13.58
25471 AM FM   2 36 12.53
17
34
17267 Alturas de NoMeAcuerdo   2 70 62.07
17
14
27307 Alternating Sequences   62 2089 32.44
8
9
5830 Alternating Permutations   1 54 39.39
34
34
8759 Alpine Skiing   1 51 38.46
394 Alphacode   576 21994 27.22
15
15
29461 Alphabetic Rope3   3 119 55.12
34
17
29458 Alphabetic Rope2   101 49.30
29455 Alphabetic Rope   7 204 34.68
20
13
10105 Alphabet Soup   28 50.00
359 Alpha Centauri Tennis   2 1724 50.53
3
8
14761 Almost-isosceles Pythagorean triple (easy)   1 64 41.65
7947 Almost square factorisation   5 120 51.97
8
11
3405 Almost Shortest Path   80 1661 31.58
22
21
26771 Almost Prime Numbers Again   15 259 18.59
25
20
34482 Allowed Factors   4 74 26.43
14
27
14844 All Your Base   12 534 29.91
11
11
12107 All Possible Barns   1 32 27.89
34
34
10283 ALL IZZ WELL   69 3431 31.27
17
14
31591 All in One   7 104 8.73
31
24
1774 All Discs Considered   10 513 28.52
26
22
26703 All about Sorting!   10 83 41.55
16
17
10471 Aliens at the train, again!   28 811 45.00
16
16
10401 Aliens at the train   85 4356 29.25
13
10
11789 Aliens at the subway   2 67 17.03
23
23
145 Aliens   2 419 29.78
34
42
32940 Alien Language   2 68 39.51
28
34
8651 Alien arithmetic   1 40 18.81
26445 Alicias Afternoon Amble   11 185 57.17
20
26
5151 Alice’s Cube   8 501 28.99
24
21
10565 Alice Sieve   31 5007 53.32
2
7
15430 Alice in Amsterdam, I mean Wonderland   3 133 23.44
17
23
105 Alice and Bob   3 165 27.12
42
42
9934 Alice and Bob   1 136 32.61
1
34
292 Alibaba   1 167 23.14
3482 Alias   4 57.14
20971 Alia and Substrings   20 21.99
20970 Alia and Handsome Devil   5 391 30.43
17
12
20972 Alia and Cryptography   3 101 43.86
30
26
20957 Alia and 3 Khans   1 74 31.44
34
17
9756 Alaska   24 2917 35.81
5
3
21326 Akbar , The great   63 2389 15.73
21
18

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