list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
391 Railroads   81 17.44
392 Spin   36 27.08
393 Hexagon   68 50.34
394 Alphacode   530 18157 27.01
14
15
395 Anti-prime Sequences   1 316 53.30
396 Hit or Miss   -1 122 44.95
397 I Conduit   3 187 17.33
28
28
398 Roll Playing Games   116 14.10
399 Team Rankings   382 53.37
400 To and Fro   81 20175 55.98
13
7
401 Translations   124 37.53
402 Hike on a Graph   8 732 40.23
17
22
403 Sort fractions   5 682 32.76
9
20
404 Scanner   52 11.67
405 Tin Cutter   133 33.59
406 Logic   102 22.67
17
1
407 Random Number   41 30.61
408 Jill Rides Again   2 853 34.60
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   4 238 33.91
17
30
412 K-path cover   180 20.37
413 Word Puzzles   4 349 19.47
30
14
414 Equatorial Bonfire   1 69 32.10
34
17
416 Divisibility by 15   5 994 15.56
31
26
417 The lazy programmer   9 563 20.52
22
23
418 Necklace   44 19.71
419 Transposing is Fun   187 40.39
34
421 Another Road Problem   66 25.24
422 Transposing is Even More Fun   200 30.57
423 Assignments   204 3870 34.57
18
22
428 Particular Palindromes   5 488 32.87
23
28
449 Simple Numbers with Fractions Conversion   2 34 17.54
34
34
479 Permutation generator   119 27.95
26
26
481 Roots of polynomial   33 31.65
484 Fossil in the Ice   405 22.08
34
17
503 Prime Intervals   55 1451 15.99
20
19
515 Collatz   1 423 44.76
1
6
518 Zig-Zag Permutation   1 41 30.98
34
34
526 Divisors   34 1467 47.22
16
14
530 Divisors 2   8 758 54.47
15
17
598 Increasing Subsequences   139 34.50
660 Dungeon of Death   12 1275 44.37
13
28
661 Nail Them   10 904 42.66
8
12
665 String it out   19 1139 41.36
13
16
666 Con-Junctions   30 806 43.69
14
19
676 Sorting is not easy   7 517 39.46
23
34
677 A place for the brewery   203 27.27
681 Building the Tower   2 92 19.50
26
17
682 Pairs of Integers   197 25.53

Most popular tags