list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
1728 Common Permutation   26 4161 46.55
6
6
2816 Common Subsequences   5 217 28.61
26
34
7783 Commuting Functions   44 25.22
25176 Compare Substring   4 132 43.13
9
9
10082 Comparing Answers   58 12.67
9382 Complan Carnival   35 36.92
1024 Complete Chess Boards   2 529 54.71
17
20
8 Complete the Sequence!   32 4408 37.45
16
18
8843 Complete the Set   1 50 31.73
1
17
19292 Complicated Calculations   93 51.44
1
1
10 Complicated Expressions   11 1551 32.03
17
17
5153 Compressed String   40 30.00
25473 CompuTenis reloaded   3 243 34.97
4
4
4008 Con Voi   9 56.00
666 Con-Junctions   32 988 40.69
14
19
10399 Conga line   -1 357 35.80
9
9
28460 Congratulations, Fidel!   1 38 13.82
17
17
3006 Connect Line Segments   1 75 25.59
17
17
4361 Connected Points   9 52.17
9459 Connecting three towns (variation)   1 52 24.66
17
34
262 Connections   1 111 28.84
34
34
35669 Consecutive Letters   7 479 26.69
17
20
6650 Consecutive sequence   4 319 44.99
20
17
21170 Constellation of the parallelogram   1 89 26.31
17
17
9936 Construct the Great Wall   9 41.67
17707 Constructible Regular Polygons   5 500 55.65
8
8
260 Containers   3 291 45.99
17
14
10447 Contaminated City   69 13.63
13398 Contest Hall Preparation   1 336 43.25
15
12
996 Continuous Fractions   1 275 37.40
9
9
1285 Continuous Fractions Again   5 370 41.66
15
10
3970 Convert to Decimal Base System   53 38.60
17
17
236 Converting number formats   149 42.42
1
1
760 Convex Hull 3D   117 41.47
3897 Convex Polygons   2 119 30.29
17
34
7023 Cookies   19 36.00
1875 Cool Numbers   6 164 30.38
30
34
22532 Cool Problem   1 16 57.14
1
17
17624 Cooperation in geometry !   20 11.79
15566 Coprime Again   7 65 26.35
27
34
18165 Coprime Pairs   13 25.68
43 Copying Books   45 2764 25.59
19
19
3078 Copying DNA   44 23.53
26314 Corn Headache   7 356 35.54
8
9
264 Corporative Network   14 596 25.01
17
19
28457 Correlations   5 92 29.53
9
13
8980 Cost   46 1173 29.24
19
26
8363 COSTLY CHESS   23 1524 43.63
14
12
27303 Count Doubles   3 623 34.44
7
5
374 Count maximum matrices   235 20.85
1
17

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