list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
390 Billiard   -1 787 54.42
17
1
391 Railroads   81 17.59
392 Spin   36 27.08
393 Hexagon   66 49.65
394 Alphacode   275 12563 27.14
13
15
395 Anti-prime Sequences   1 301 52.86
396 Hit or Miss   -1 121 44.77
397 I Conduit   1 155 16.76
17
17
398 Roll Playing Games   114 14.12
399 Team Rankings   379 53.39
400 To and Fro   43 16483 56.24
14
8
401 Translations   122 37.41
402 Hike on a Graph   6 696 40.59
21
27
403 Sort fractions   4 650 32.96
9
17
404 Scanner   52 11.70
405 Tin Cutter   130 33.40
406 Logic   100 23.14
407 Random Number   40 30.73
408 Jill Rides Again   2 802 35.02
12
12
409 DEL Command   66 15.51
410 Variable Radix Huffman Encoding   1 134 18.53
411 Number of quite different words   4 220 33.51
17
30
412 K-path cover   167 19.57
413 Word Puzzles   2 313 19.11
34
17
414 Equatorial Bonfire   67 31.09
416 Divisibility by 15   3 952 15.33
28
28
417 The lazy programmer   1 347 19.34
9
17
418 Necklace   33 21.67
419 Transposing is Fun   168 40.35
34
421 Another Road Problem   66 25.24
422 Transposing is Even More Fun   176 28.66
423 Assignments   89 2671 32.27
18
22
428 Particular Palindromes   3 444 32.20
17
23
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   328 20.09
34
17
503 Prime Intervals   33 906 15.28
19
19
515 Collatz   2 397 48.53
1
9
518 Zig-Zag Permutation   38 30.17
526 Divisors   16 1071 44.91
17
15
530 Divisors 2   4 639 53.73
15
17
598 Increasing Subsequences   139 34.56
660 Dungeon of Death   10 1125 43.49
13
28
661 Nail Them   6 712 44.33
6
8
665 String it out   6 861 40.80
11
17
666 Con-Junctions   20 613 43.81
17
22
676 Sorting is not easy   4 484 39.35
12
34
677 A place for the brewery   198 26.82
681 Building the Tower   2 84 18.54
26
17

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