list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
530 Divisors 2   10 936 52.47
12
16
726 Promotion   24 2103 28.18
12
8
9126 Time to live   48 2058 37.70
12
15
14507 GAME2   10 104 25.04
12
11
21461 Field   7 281 37.99
12
10
25854 Palindrome Or Not   11 339 16.57
12
8
34705 Secret Recipe   10 158 39.82
12
11
4564 Chop Ahoy! Revisited!   55 2968 50.84
12
14
18941 True Friends   30 1034 51.33
12
13
7586 Number of Palindromes   9 1426 46.68
13
13
10401 Aliens at the train   85 4483 29.27
13
10
34020 Ada and Pet   29 655 27.01
13
19
377 Taxi   14 1245 28.48
13
16
1787 Run Length Encoding   7 861 19.62
13
3
2007 Another Very Easy Problem! WOW!!!   17 792 39.04
13
28
2050 Strange Billboard   10 805 60.55
13
29
6471 Printing some primes   71 7831 28.93
13
11
11321 G-One Sort   5 782 37.62
13
17
13381 Manku Word   31 2117 47.15
13
15
18939 K-th smallest number   5 219 13.94
13
17
21177 Distracted judges   6 324 44.91
13
17
26308 Get higher and higher   7 146 39.57
13
24
32103 Degree of a Tree   15 231 30.62
13
12
34376 Difference One Swaps   7 75 48.60
13
17
35147 Bermuda Love Triangle   6 48 58.60
13
15
36537 Koala Fan   8 50 25.36
13
10
5161 Factorial vs Power   14 1140 25.97
13
15
30735 Ada and Island   18 628 34.70
13
12
740 Treats for the Cows   261 8632 42.74
13
14
8916 Villages by the River   7 279 24.41
13
20
11354 Amusing numbers   53 3254 59.78
13
15
26955 The Maximize Sum   8 261 24.62
13
14
27318 Primal Fear   31 1755 22.01
13
13
2884 Martian Mining   89 2328 47.80
13
22
26745 Grid   16 672 33.11
13
9
27321 Increasing numbers   17 587 23.86
13
19
34875 Minimum Stocks   16 674 25.46
13
12
14956 Submerging Islands   107 4727 39.71
13
14
10676 0110SS   26 1772 41.09
13
9
15267 FRIEND CIRCLE   28 1442 28.43
13
11
24998 PLAYING WITH BITS   34 796 22.00
13
13
302 Count on Cantor   155 13081 61.26
13
14
40 Lifting the Stone   6 1651 23.80
13
16
660 Dungeon of Death   14 1355 42.80
13
26
1000 Equidivisions   -1 654 23.39
13
13
1001 Babylonian Roulette   1 666 50.46
13
13
3639 Lucky Numbers   7 733 34.15
13
9
3753 GONDOR   4 395 53.39
13
13
3932 Point Connection Game in a Circle   3 768 35.47
13
21
4908 Run-Length Mathematics   6 721 41.17
13
1

Most popular tags