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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
7809 Cow Photographs   2 168 35.60
26
26
7022 Cow Patterns   3 115 24.60
28
28
2714 Cow Cars   5 658 37.39
14
17
8593 Covering the Corral   8 31.58
26744 Coverage   21 38.20
8758 Cover the string   6 220 23.32
14
17
12004 Cousin Wars   2 33 18.77
26
26
29434 Counting WOW-Substrings2   7 100 45.03
15
22
29431 Counting WOW-Substrings   10 128 38.33
10
19
11947 Counting Words   2 163 26.24
17
17
27483 Counting Words   4 45 49.15
17
21
1731 Counting Triangles III   1 263 33.76
1730 Counting Triangles II   2 401 20.79
17
17
6408 Counting Triangles 2   -1 55 33.60
50
50
1724 Counting Triangles   69 13091 34.03
7
21
5464 Counting triangles   3 204 28.86
6
28
4038 Counting The Way of Bracket Replacement   7 437 38.79
26
21
8335 Counting the teams   1 23 45.61
34
50
2150 Counting Subsequences   13 1025 29.52
9
13
2450 Counting Rabbits   8 1217 34.01
10
12
19913 Counting Pythagorean Triples   3 16 14.23
26
42
13015 Counting Primes   33 1386 22.09
16
14
7186 Counting Pascal   2 125 29.11
17
17
20872 Counting Pairwise Coprime Triples   1 47 53.73
34
34
5542 Counting pairs   4 131 26.46
39
36
28599 Counting Magical Permutatitons   7 57 27.85
17
29
13444 Counting Lucky Numbers   3 171 30.07
17
17
4329 Counting K-Rectangle   4 387 30.01
20
28
861 Counting inversions   7 463 19.98
34
29
4882 Counting in a DAG   6 171 12.04
17
26
15429 Counting Ids   15 1926 49.80
5
5
4420 Counting Graphs   58 34.93
10605 Counting Formations   2 14 56.41
34
34
4478 Counting Expressions II   14 35.29
4411 Counting Expressions   29 42.47
20173 Counting Divisors (square)   7 438 21.74
29
38
34096 Counting Divisors (general)   5 329 35.35
42
45
20174 Counting Divisors (cube)   7 363 34.89
21
42
26073 Counting Divisors   3 122 24.79
39
34
3928 Counting Digits   7 1178 45.10
22
26
11676 Counting diff-pairs   14 185 22.44
24
26
6500 Counting Diameter   36 40.78
9547 Counting d-pairs   2 135 30.74
23
28
34009 Counting Child   18 416 54.85
7
9
9570 Counting binary strings   7 338 53.04
17
24
4407 Counting Arborescence   100 34.02
12943 Counting   5 79 47.71
8
30
26799 Counter-Smack   3 56 19.96
12
23
6805 Counter attack   3 175 60.72
17
17
1704 Countdown   298 25.14
26
9

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