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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
10810 Its a Murder!   56 2404 22.16
16
16
7356 Iterated Bitcount Function   2 36 16.47
42
34
13809 ISRANK   1 22 34.09
50
50
23383 ISOMORPH   29 43.52
6622 Islands and Hotel Chains   2 66 9.68
45
34
8097 Islands   73 46.82
2274 Island Hopping   1 207 25.14
17
1
5159 Island Explorer   37 15.74
9943 Isabella Message   1 69 24.22
17
17
1436 Is it a tree   339 21156 35.31
10
10
4421 Irreducible polynomials over GF2   64 18.04
9950 IQ Team   1 44 43.31
50
50
11509 IPL - CRICKET TOURNAMENT   1 83 25.84
17
17
11198 Ipad Testing   2 51 42.08
34
1
1784 IOICamp Sequence   1 325 12.80
1
17
6956 IOI2009 Mecho   3 167 18.36
28
23
50 Invitation Cards   29 1783 43.12
16
18
7870 Invisible point   17 1671 42.96
4
18
3964 Investment Money   15 627 25.73
16
17
7232 Inversion Sort   5 173 16.34
32
23
6256 Inversion Count   534 18105 32.03
16
18
14122 Inverse of Recurrence Problem With a Square Root   3 61 49.14
23
45
2731 Inventing Test Data   4 555 24.97
15
28
25480 Invading aliens   19 18.35
116 Intervals   5 1200 24.29
21
24
5298 Interval Challenge   4 143 16.92
24
27
22331 Intersection Query   1 18 19.85
50
34
40945 Internet Spamming   4 26 27.74
17
17
2153 Internet is Faulty   69 38.54
962 Intergalactic Map   2 569 23.41
19
28
11952 Intergalactic Highways   3 152 29.08
17
17
20654 Interesting Subset   5 97 23.84
11
14
20846 Interesting Selection   5 130 44.09
13
26
20849 Interesting queries   3 46 34.12
34
34
20845 Interesting Numbers   4 221 24.19
13
5
279 Interesting number   26 846 24.20
19
24
21418 Interesting Game with Polygons   1 36 28.02
17
34
20848 Interesting Game   60 44.68
7192 Integral Maximization   1 375 38.35
50
50
4948 Integer Factorization (29 digits)   8 124 14.80
40
34
4941 Integer Factorization (20 digits)   8 614 55.35
34
30
4942 Integer Factorization (15 digits)   45 3695 32.76
11
11
1881 Instruction Decoder   2 668 50.81
17
17
9722 Insertion Sort   28 4083 31.44
12
12
28463 Insect invasion   1 21 9.90
34
34
27683 Inquire   12 764 54.72
6
4
18187 Ingredients   10 295 31.69
21
23
7763 Ingenious Metro   84 66.84
19150 Infinite Sequence   1 154 30.20
1
34
25476 Induced favoritism   1 47 29.65
17
34

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