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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
25 Pouring water   100 5585 24.42
19
22
1845 Mice and Maze   100 5569 35.93
10
10
7259 Light Switching   102 4703 34.36
16
15
42 Adding Reversed Numbers   103 88631 48.70
6
4
2157 Anti-Blot System   104 12968 45.24
10
5
1030 Triple Fat Ladies   106 19217 51.73
4
12
7676 Sum of Digits   106 5040 38.80
17
20
14956 Submerging Islands   107 4729 39.71
13
14
1684 Frequent values   112 3998 27.66
20
21
1710 Two Ends   115 3790 41.56
18
17
913 Query on a tree II   118 4792 20.97
23
21
1419 A Game with Numbers   118 12077 61.46
3
10
7299 Multiples of 3   121 3784 23.64
20
17
9948 Will it ever stop   121 17946 43.01
4
9
3410 Feynman   122 34531 57.48
4
6
1435 Vertex Cover   129 4159 34.36
15
18
12323 Minimum Knight moves !!!   133 8724 42.66
15
11
7742 Onotole needs your help   138 10153 41.10
4
11
39 Piggy-Bank   140 8251 35.53
14
16
4141 Euler Totient Function   147 12046 39.04
8
11
4560 The Double HeLiX   147 8980 37.55
11
10
4033 Phone List   151 7338 31.82
16
14
370 Ones and zeros   152 4522 30.11
19
21
11515 I AM VERY BUSY   153 8654 45.05
9
11
24 Small factorials   154 51427 29.64
15
9
302 Count on Cantor   155 13081 61.26
13
14
15 The Shortest Path   157 7726 24.06
17
12
12471 DIE HARD   157 7987 38.69
12
13
3273 Order statistic set   160 3456 26.92
22
20
9921 ABC Path   162 7897 21.89
15
12
54 Julka   165 23428 27.55
19
6
16487 Update the array !   165 5029 38.78
9
14
375 Query on a tree   167 5902 17.61
33
27
11814 Eko   172 16740 26.94
14
14
11 Factorial   175 60729 45.15
6
12
4300 Rectangles   176 27070 49.75
5
8
61 Brackets   178 5548 24.46
19
20
8001 Fibonacci Sum   182 6995 27.96
19
19
5449 Seinfeld   189 9560 40.07
8
11
3442 The last digit   190 30127 26.99
9
8
32 A Needle in the Haystack   193 11386 38.38
15
14
9861 Hotels Along the Croatian Coast   211 9067 41.78
10
12
10582 subarrays   215 9571 34.37
11
13
4580 ABCDEF   218 7923 29.36
14
16
1805 Largest Rectangle in a Histogram   229 8771 28.43
18
23
14932 Lowest Common Ancestor   234 7949 29.26
15
15
1716 Can you answer these queries III   236 12150 43.84
22
21
423 Assignments   244 4840 33.70
18
22
3946 K-th Number   245 5843 35.44
25
27
206 Bitmap   247 9663 28.29
15
16

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