list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
30785 Ada and Apple   12 209 25.05
29
23
32059 Ada and Taxes   16 113 36.48
23
23
3267 D-query   461 13991 28.60
19
23
6898 Substring Problem   22 851 15.19
23
23
11180 369 Numbers   19 901 12.77
25
23
13631 BATMAN2   19 603 27.49
17
23
8547 Euclids algorithm revisited   28 1474 22.86
19
23
151 The Courier   38 1070 35.64
22
23
13 Hotline   2 215 16.15
34
23
59 Bytelandian Information Agency   2 421 19.64
17
23
62 The Imp   1 300 31.14
17
23
65 Ball   2 159 35.03
17
23
122 Voracious Steve   2 275 29.95
23
23
134 Phony Primes   1 183 19.22
23
23
153 Balancing the Stone   2 329 33.01
17
23
188 Rectangles   2 187 12.83
17
23
967 Parking Bay   3 565 48.93
12
23
1465 On the Way to Find Chris   2 62 15.35
23
23
1552 Mobiles   192 28.32
28
23
1675 Fusion Cube   1 87 50.77
1
23
1707 Reliable Nets   4 342 31.51
28
23
2856 Help Bob   6 278 31.72
21
23
3105 Power Modulo Inverted   6 1156 27.55
15
23
3111 Stabards   3 166 43.65
12
23
3389 The Knights of the Round Circle   3 451 66.86
6
23
3866 Finding Palindromes   7 257 19.62
19
23
3974 Another Tree Problem   7 647 32.53
15
23
3982 String problem   7 608 48.82
9
23
3999 FROGGER   3 104 26.72
28
23
4197 Dominoes   4 125 23.08
23
23
4483 Roads Repair   7 182 32.65
20
23
5969 Finding Maximum   3 109 30.31
13
23
6356 Rock-Paper-Scissors-Lizard-Spock   2 178 42.29
12
23
6956 IOI2009 Mecho   3 167 18.36
28
23
7188 Escape from Jail   12 629 30.98
18
23
7232 Inversion Sort   5 173 16.34
32
23
7250 Blocks for kids   2 102 40.56
23
23
7866 Regular expressions (Hard)   1 140 27.33
28
23
8263 Big Pyramid   3 51 62.92
23
23
8391 The Ball   3 126 10.63
28
23
8407 Candies and Milestones   2 480 21.94
6
23
8591 Prime Permutations   5 110 30.96
28
23
8989 Funny programming contest   3 38 19.84
12
23
10466 Enough of analyzing, let’s play   5 262 45.78
17
23
10711 VUK   6 200 54.47
20
23
10958 Vero Dominoes   3 419 45.30
1
23
11564 E 23 Stairs pattern   1 140 39.70
17
23
11574 A Famous Stone Collector   3 130 36.03
9
23
11789 Aliens at the subway   2 78 18.13
23
23
12001 Bit by Bit   2 144 37.28
17
23

Most popular tags