list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
12012 grace marks   5 224 22.86
21
21
12030 Blackout   5 372 44.55
20
15
12076 Longest Common Subsequence   5 121 4.20
50
50
12241 Classification from ErdÅ‘s and Selfridge   5 27 17.71
28
28
12304 Smallest Inverse Sum of Divisors   5 84 27.94
17
24
12726 XOR Game   5 534 43.85
11
13
12746 Colorful Circle (EASY)   5 463 20.68
28
23
12943 Counting   5 79 47.71
8
30
13096 Amr Samir   5 914 31.04
9
10
13105 DNA   5 640 36.83
11
24
13405 MayanCalendar   5 121 54.45
8
8
13838 Mosty! Find Gn   5 556 49.54
9
24
14175 Power Factor Sum Sum (hard)   5 39 36.97
26
26
14823 Advanced Battleships   5 49 13.42
23
23
14935 Cactus   5 160 19.12
16
14
15215 David and his Obsession   5 426 41.32
12
9
15439 Zombie Outbreak   5 68 25.37
21
21
15506 Helping Igor   5 97 36.04
15
12
15847 Equalize the Sectors   5 155 60.25
10
27
16034 Minimum Number   5 491 16.05
11
1
16134 Save the cows!   5 59 14.08
1
6
16282 Horace and his primes   5 257 40.69
27
27
16283 Treasure Island   5 131 24.53
17
15
16300 Playing with isosceles triangle   5 313 27.04
13
21
16825 Divisors   5 86 17.54
21
26
17406 Cheating a Boolean Tree   5 111 35.78
23
15
17559 Two Game   5 317 36.97
1
39
17627 Family members   5 425 59.78
9
15
17660 The Bridge to Home   5 115 34.96
23
34
17707 Constructible Regular Polygons   5 500 55.65
8
8
17731 Buying Integers   5 107 40.71
8
11
18917 Dukkar and Pikka   5 296 56.14
7
23
18932 Sum of primes (reverse mode)   5 21 17.44
45
45
18939 K-th smallest number   5 209 13.84
13
17
19224 Lights, Snakes and Cages   5 85 17.52
24
34
19957 GETTING AN AP   5 488 36.75
8
12
19975 Amazing Prime Sequence (hard)   5 81 41.88
39
45
20170 Coloring Segments   5 87 20.40
31
34
20654 Interesting Subset   5 93 23.38
11
14
20846 Interesting Selection   5 123 43.21
13
26
20970 Alia and Handsome Devil   5 391 30.43
17
12
20979 Good   5 73 41.26
17
27
21353 Avantgarde and Doughnut   5 19 45.90
21
34
21360 Suffix Equal Prefix   5 500 28.54
13
13
21414 Count The Indexes 2   5 41 18.11
37
24
21456 I Ken Bit Yu   5 117 30.99
9
21
21457 House Fence   5 143 27.93
9
21
21525 Red John is Back   5 315 53.58
6
17
21964 Golf Bot   5 81 35.75
34
27
22303 Mau-Mau   5 75 16.67
36
17

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