list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
26778 NO GCD   11 105 22.58
29
38
30785 Ada and Apple   12 209 25.05
29
23
9577 Dynamic Tree Connectivity   13 655 28.75
29
28
22463 Smallest Number (medium)   9 70 21.04
29
25
32257 Apoorv and Math problem   11 174 14.96
29
16
115 Family   2 79 12.22
28
28
422 Transposing is Even More Fun   2 316 26.08
28
39
898 Transmitters   2 339 49.21
28
17
1448 3D Cover   3 100 27.12
28
17
1475 Play with Digit Seven   3 136 38.22
28
12
1552 Mobiles   192 28.32
28
23
1557 Can you answer these queries II   26 1791 25.06
28
35
1707 Reliable Nets   4 342 31.51
28
23
2051 Cell Phone   4 161 31.43
28
36
2414 Calculate The Cost   8 343 22.37
28
17
2670 Count Minimum Spanning Trees   4 189 17.41
28
39
2678 Closest distance   1 167 13.83
28
34
3732 Slikar   1 213 52.05
28
17
3999 FROGGER   3 104 26.72
28
23
4350 Giá trị lớn nhất 3   15 419 23.50
28
20
4667 Gremlins   3 56 29.10
28
34
5294 Recurrence   2 262 14.44
28
17
6956 IOI2009 Mecho   3 167 18.36
28
23
7022 Cow Patterns   3 128 26.15
28
28
7866 Regular expressions (Hard)   1 140 27.33
28
23
8093 Sevenk Love Oimaster   2 580 24.55
28
28
8391 The Ball   3 126 10.63
28
23
8542 Modern Pocket Calculator   35 9.05
28
6
8591 Prime Permutations   5 110 30.96
28
23
11414 Combat on a tree   3 256 31.12
28
34
11443 Davids Greed   3 253 26.22
28
19
11580 A Famous Game   409 34.93
28
28
12241 Classification from Erdős and Selfridge   5 32 19.60
28
28
12746 Colorful Circle (EASY)   5 484 20.91
28
23
13367 EVEN COUNT   8 352 23.15
28
19
13738 Happy Valentine Day (Valentine Maze Game)   3 150 36.54
28
23
14928 Pyramidal Constructions   -1 336 48.72
28
23
15148 play with prime numbers (II)   5 35 20.83
28
23
15190 MAXIMUM RARITY   6 90 35.38
28
34
15769 Enjoy Adding GP to Series   2 63 26.67
28
34
17711 Gopu and Create Collections Part Two   4 266 29.30
28
28
18094 Robert Langdon & Florence   1 181 64.31
28
23
18667 Product of factorials (hard)   3 46 27.10
28
34
19143 TRISQRS   172 38.08
28
34
19148 Kill them All   3 129 23.60
28
34
20041 Hippo and Bloody Jungle   -1 43 21.74
28
17
21642 Tsunami   3 145 40.88
28
23
21834 Sadde and His City   3 45 21.63
28
23
23806 Yossy, The King of IRYUDAT   3 48 5.51
28
39
25001 Red Blue Line Segments   2 319 19.48
28
26

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