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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
2273 Ferries   29 17.75
30691 Ada and Diary   1 55 17.77
1
1
2485 Phone Lines   18 17.80
8284 Weighted Sum   6 508 17.80
9
13
31342 Simple Path   11 17.81
16267 Real Numbers   2 169 17.82
26
26
26054 BMW   21 601 17.83
12
14
9687 Xavier is Learning to Count   1 28 17.84
39
39
34812 Kth Power Summation   6 54 17.85
25
19
2141 Golden Garden   17 17.86
16483 Lucky Cities   2 29 17.86
17
26
18393 Hamiltonian Cycles   1 25 17.89
17
17
7563 Hi6   37 17.90
26
26
22455 SUM OF PRODUCT   34 1038 17.90
18
20
34357 Ludic Numbers (hard)   2 4 17.91
26721 I LOVE Kd-TREES III   4 77 17.91
34
34
36671 Bipartite Permutation (Hard)   6 51 17.91
32
34
23541 CWC-2015   8 142 17.93
17
17
2511 Magic Program IV   27 17.99
7232 Inversion Sort   5 152 17.99
32
23
5511 Heavy Sequences   79 18.00
34
34
12807 Recursive Sequence (Version X)   7 18.00
18666 Radiation   1 29 18.00
700 Branch Prediction   74 18.00
4305 Drilling   3 96 18.01
17
34
4421 Irreducible polynomials over GF2   62 18.01
10877 Decoys and Diversions   45 18.03
9
17
413 Word Puzzles   4 364 18.07
30
14
9516 XOR Equations   14 18.07
4003 Subway planning   40 18.08
13886 BLOCK_D SOLVER   2 17 18.10
17
26
21414 Count The Indexes 2   5 41 18.11
37
24
3983 Right Triangle Counting   3 188 18.12
30
21
5672 Captain Selection   2 18.18
6956 IOI2009 Mecho   3 159 18.18
28
23
12004 Cousin Wars   2 32 18.18
26
26
12370 Generating Alien DNA   1 31 18.18
34
34
26183 Laser Beam 2.0   1 4 18.18
17
17
26893 Pristojba   2 16 18.18
26
50
30351 Quest Hunter   10 18.18
33049 Ada and Chess   5 38 18.18
26
17
3106 Dictionary Subsequences   3 162 18.20
17
17
35954 New Data Type   118 18.23
8
8
3107 Odd Numbers of Divisors   27 1039 18.24
22
22
7155 Test   10 362 18.26
34
27
34910 Easy Math   2 590 18.26
2
4
32683 Ada and Kohlrabi   5 66 18.29
30
13
3643 Traffic Network   89 2088 18.30
18
21
12916 MMM   3 79 18.31
21
26
34551 Stopping-off Cities   6 66 18.31
26
23

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