list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
390 Billiard   -1 799 54.35
17
1
391 Railroads   81 17.59
392 Spin   36 27.08
393 Hexagon   66 49.65
394 Alphacode   318 13528 27.19
13
15
395 Anti-prime Sequences   1 302 52.93
396 Hit or Miss   -1 122 44.95
397 I Conduit   1 165 16.37
17
17
398 Roll Playing Games   114 14.12
399 Team Rankings   379 53.39
400 To and Fro   49 17164 56.20
14
7
401 Translations   123 37.56
402 Hike on a Graph   6 700 40.49
21
27
403 Sort fractions   4 658 32.99
9
17
404 Scanner   52 11.70
405 Tin Cutter   130 33.40
406 Logic   100 23.09
407 Random Number   40 30.73
408 Jill Rides Again   2 817 34.97
12
12
409 DEL Command   66 15.51
410 Variable Radix Huffman Encoding   1 134 18.37
411 Number of quite different words   4 222 33.65
17
30
412 K-path cover   167 19.57
413 Word Puzzles   2 322 19.10
34
17
414 Equatorial Bonfire   67 31.09
416 Divisibility by 15   4 963 15.43
27
21
417 The lazy programmer   1 376 19.87
9
17
418 Necklace   33 21.54
419 Transposing is Fun   172 40.30
34
421 Another Road Problem   66 25.24
422 Transposing is Even More Fun   183 29.02
423 Assignments   108 2885 32.60
18
22
428 Particular Palindromes   3 458 32.03
17
26
449 Simple Numbers with Fractions Conversion   31 16.41
479 Permutation generator   114 28.45
481 Roots of polynomial   33 32.26
484 Fossil in the Ice   338 20.27
34
17
503 Prime Intervals   39 1002 15.68
21
20
515 Collatz   2 402 48.96
1
9
518 Zig-Zag Permutation   38 30.00
526 Divisors   20 1131 45.66
17
13
530 Divisors 2   5 672 53.71
15
17
598 Increasing Subsequences   139 34.50
660 Dungeon of Death   10 1171 43.41
13
28
661 Nail Them   6 725 44.54
6
8
665 String it out   8 910 41.26
10
17
666 Con-Junctions   23 652 44.13
16
21
676 Sorting is not easy   4 492 39.20
12
34
677 A place for the brewery   200 27.06
681 Building the Tower   2 86 19.08
26
17

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