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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
3261 Race Against Time   38 1181 24.86
21
21
13399 Rachu   8 1051 33.69
8
10
18666 Radiation   2 36 20.00
17
34
13807 Rage Drug   3 35 36.13
17
21
391 Railroads   90 17.63
17
17
15574 Railway   2 19 23.03
34
34
2127 Rain   4 438 40.61
20
15
4458 Rainbow   2 38 19.53
34
42
3724 Rainbow Ride   9 497 36.16
19
19
6906 Raining Parabolas   2 257 21.65
26
26
22177 RajaRani   3 9 8.33
17
17
18149 Rama and Friends   10 999 28.64
14
12
36937 Random Magic Trick   5 19 41.18
26
34
36142 Random modulo n   16 79 60.59
8
15
407 Random Number   48 29.13
17
17
2002 Random Number Generator   98 40.62
14543 Range Sum   26 1014 38.04
11
12
10611 Ranges   2 176 19.62
9
9
6264 Rank of a Fraction   4 132 31.92
12
34
1526 Ranklist Sorting   1 28 13.10
17
34
16180 Ratar   83 27.27
17
17
7389 Rating Hazard   25 19.44
9386 Re-Arrange II   9 278 44.33
21
17
13913 Real Mangoes for Ranjith   7 1939 41.78
3
8
16267 Real Numbers   2 172 17.97
26
26
18174 REAL ROOTS   15 1287 60.04
6
12
6985 Rearranging Digits   56 22.53
2058 Reaux! Sham! Beaux!   4 664 32.90
23
6
3934 Recaman’s Sequence   25 3537 53.88
9
6
8423 Recover Polynomials   58 49.68
2038 Rectangle Tiling   2 116 41.61
1
1
188 Rectangles   2 187 12.83
17
23
1960 Rectangles   4 174 16.62
34
28
4300 Rectangles   176 27068 49.75
5
8
3890 Rectangles Counting   175 33.61
8285 Rectangles in a Matrix   2 7 17.11
17
34
3878 Rectangles Perimeter   58 2702 49.87
12
14
2056 Rectangular Polygon   1 136 48.14
1
17
5294 Recurrence   2 262 14.44
28
17
37422 Recurrence Power Sum   4 29 19.25
45
46
339 Recursive Sequence   79 3840 50.29
20
17
2699 Recursive Sequence (Version II)   16 1013 26.12
26
24
37226 Recursive Sequence (Version III)   4 11 18.31
34
34
12807 Recursive Sequence (Version X)   12 16.28
11386 Recycled Numbers   1 198 31.86
12363 Red And Green   7 257 40.14
8
14
8317 Red Balls   47 44.77
25001 Red Blue Line Segments   2 320 19.51
28
26
11712 Red Cross Hospital   1 21 25.22
34
1
21525 Red John is Back   5 318 53.38
6
17

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