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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
177 AB-words   1 16 1.20
50
50
4160 A1 Road   89 50.90
1688 A Very Easy Problem!   40 6172 49.09
12
11
25396 A Terribly Grimm Problem   3 21 30.10
34
30
11695 A Summatory (HARD)   6 102 29.79
31
29
37514 A Summatory (Extreme)   5 49 22.91
34
36
11560 A Summatory   14 1646 26.01
5
4
18465 A Subtle Surf   6 204 43.41
14
11
40501 A Simple Sieve   3 7 8.70
45
50
1460 A Simple Calculator in the Galaxy   35 37.96
34
1482 A short vacation in Disneyland   5 236 14.80
29
20
15076 A Romantic Movie Outing   27 18.39
15075 A Romantic Dinner Outing   22 17.77
1
1
15270 A plus B   1 12 5.53
34
34
18468 A Pleasant Stroll   10 138 35.42
23
19
677 A place for the brewery   219 28.30
17
1
5142 A Pair of Graphs   1 70 54.23
17
17
34575 A New Task for Ibrahim   6 39 52.48
4
28
32 A Needle in the Haystack   193 11379 38.37
15
14
8992 A los saltos   39 29.81
7969 A Knights’ Tale   3 80 22.93
17
17
4176 A Knightly Pursuit   2 67 29.28
26
17
15092 A Kleene Implementation   5 34.04
6950 A HUGE TOWER   1 131 48.34
1
34
4060 A game with probability   210 22.15
1419 A Game with Numbers   118 12077 61.48
3
10
1447 A Game of Toy Bricks   42 27.12
1
1
1471 A Game of Pearls   1 45 30.86
17
9
10460 A function over factors   1 102 32.78
1
17
18466 A Frightening Evening   1 124 29.53
1
1
11574 A Famous Stone Collector   3 130 36.03
9
23
11576 A Famous King’s Trip   25 10.72
11573 A Famous ICPC Team   10 2046 37.72
2
8
11582 A Famous Grid   3 196 16.90
17
17
11580 A Famous Game   409 34.93
28
28
11575 A Famous Equation   2 81 27.32
34
34
11578 A Famous City   10 807 30.89
16
21
4461 A Famous Airport Manager   27 17.18
4559 A Day at the Races   128 17.79
34863 A Cumulative Sum Problem   5 39 22.31
34
42
22675 A conjecture of Paul Erdős (hard)   2 5 5.81
34
34
4164 A conjecture of Paul Erdős   25 2696 43.78
16
14
376 A concrete simulation   15 1735 34.38
11
12
35088 A Complex Cone   4 58 22.46
26
34
19551 A Colorful world   3 89 31.99
6
1
5271 A Coin Game   4 554 31.99
21
30
11904 A Classic Myth - Flatland Superhero   11 41.18
1326 A Chase In WonderLand   2 412 13.56
6
1
9636 A Canvas Building   71 18.04
17
17
3377 A Bug’s Life   343 15927 27.72
12
13

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