list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
1 Life, the Universe, and Everything   295 212788 33.01
4
3
5 The Next Palindrome   451 19902 10.74
25
18
27 Sorting Bank Accounts   53 8674 40.50
11
6
42 Adding Reversed Numbers   103 75737 48.42
6
4
56 Dyzio   8 1205 31.52
11
14
78 Marbles   67 7861 34.95
15
13
95 Street Parade   317 18010 28.96
14
11
138 Election Posters   65 2260 25.64
20
21
178 Road net   11 2362 49.53
9
8
328 Bishops   82 8905 32.03
14
7
366 Farmer   1 263 16.99
1
1
379 Ambiguous Permutations   70 12288 59.53
4
5
400 To and Fro   89 23218 55.55
14
7
408 Jill Rides Again   2 932 34.11
9
9
867 Perfect Cubes   11 2166 47.62
7
5
899 Ws Cipher   6 837 38.33
14
15
904 Image Perimeters   3 331 59.44
17
17
1025 Fashion Shows   30 27486 46.37
3
3
1030 Triple Fat Ladies   106 18997 51.76
4
12
1112 Number Steps   84 33666 43.24
4
4
1166 Dead Fraction   315 23.21
17
26
1285 Continuous Fractions Again   5 368 41.98
17
12
1326 A Chase In WonderLand   2 402 13.44
9
1
1688 A Very Easy Problem!   40 6161 49.23
12
11
1709 Swamp Things   285 40.35
1724 Counting Triangles   69 13008 34.03
7
21
1787 Run Length Encoding   7 855 19.61
15
4
1805 Largest Rectangle in a Histogram   221 8026 27.57
18
24
1866 Making Pals   2 201 43.68
17
17
1868 Making Money   6 793 36.62
8
4
2123 Candy I   95 28415 44.19
3
4
2148 Candy III   54 20339 25.29
9
5
2320 Manhattan   8 689 32.21
20
34
2525 Encoding   3 744 29.02
12
12
2526 Decoding   9 1034 36.32
23
15
2528 Monkey Vines   4 775 43.31
17
9
2731 Inventing Test Data   3 374 28.12
14
27
2852 Broken Keyboard   19 1188 31.46
14
14
3070 How many subsequences   1 94 9.74
34
34
3184 Game of Lines   8 1299 27.73
14
9
3253 Electronic Document Security   3 149 60.78
23
6
3261 Race Against Time   37 1035 23.74
21
21
3362 Setnja   2 239 21.15
9
17
3375 Stamps   28 13678 41.74
5
3
3394 Lagrange’s Four-Square Theorem   4 527 45.84
1
9
3442 The last digit   188 29207 26.94
9
8
3921 The Great Ball   60 3922 39.08
7
11
3928 Counting Digits   7 1077 43.89
22
26
3934 Recaman’s Sequence   25 3525 53.89
9
6
3979 Whirligig number   7 1019 37.93
10
15

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