list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
391 Railroads   82 17.56
392 Spin   36 27.08
393 Hexagon   68 50.34
394 Alphacode   543 18777 26.36
14
15
395 Anti-prime Sequences   1 310 49.39
396 Hit or Miss   -1 122 44.95
397 I Conduit   3 180 15.74
28
28
398 Roll Playing Games   116 14.10
399 Team Rankings   383 53.42
400 To and Fro   84 20774 55.64
13
7
401 Translations   125 37.68
402 Hike on a Graph   8 738 40.14
17
22
403 Sort fractions   5 681 32.58
9
20
404 Scanner   52 11.67
405 Tin Cutter   133 33.59
406 Logic   103 22.65
17
1
407 Random Number   41 30.61
408 Jill Rides Again   2 865 34.32
12
12
409 DEL Command   1 67 15.66
17
17
410 Variable Radix Huffman Encoding   1 171 18.93
411 Number of quite different words   4 239 33.94
17
30
412 K-path cover   173 19.57
413 Word Puzzles   4 344 17.60
30
14
414 Equatorial Bonfire   1 69 32.10
34
17
416 Divisibility by 15   5 988 15.29
31
26
417 The lazy programmer   9 574 19.79
22
23
418 Necklace   44 19.62
419 Transposing is Fun   183 33.63
34
421 Another Road Problem   66 25.24
422 Transposing is Even More Fun   197 23.34
423 Assignments   214 4007 32.97
18
21
428 Particular Palindromes   5 483 31.97
23
28
449 Simple Numbers with Fractions Conversion   2 34 17.54
34
34
479 Permutation generator   1 120 28.04
28
23
481 Roots of polynomial   33 31.65
484 Fossil in the Ice   408 21.82
34
17
503 Prime Intervals   58 1497 15.55
21
19
515 Collatz   1 425 44.63
1
6
518 Zig-Zag Permutation   1 41 30.98
34
34
526 Divisors   34 1502 43.56
16
14
530 Divisors 2   8 772 51.95
15
17
598 Increasing Subsequences   139 34.36
660 Dungeon of Death   13 1287 42.68
13
28
661 Nail Them   10 928 42.74
8
12
665 String it out   20 1156 38.26
12
16
666 Con-Junctions   30 826 40.76
14
19
676 Sorting is not easy   8 522 39.50
22
32
677 A place for the brewery   205 27.35
681 Building the Tower   2 93 19.62
26
17
682 Pairs of Integers   198 25.69

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