list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
278 Bicycle   62 13.55
34
1
279 Interesting number   26 846 24.20
19
24
280 Lifts   45 17.61
17
1
283 Naptime   676 26.45
17
1
286 Selfish Cities   1 711 39.03
31
31
288 Prime or Not   73 5482 19.33
21
22
290 Polynomial Equations   66 21.91
17
17
297 Aggressive cows   1075 47515 35.98
16
23
303 The Unstable Cube   1 51 28.10
17
1
309 The Room Pattern   1 48 14.99
34
17
325 The Tall Windmills   82 22.57
34
328 Bishops   83 8988 32.04
14
7
329 Calls   2 129 29.63
1
17
332 Hard Question   106 33.05
1
34
339 Recursive Sequence   79 3840 50.29
20
17
351 Ha-noi!   386 42.45
1
1
359 Alpha Centauri Tennis   2 1755 50.27
3
8
363 Crane Operator   5 2.71
364 Pocket Money   53 2248 38.59
15
18
368 Cobbled streets   98 5441 50.87
13
12
372 The Benefactor   49 3099 35.38
12
13
376 A concrete simulation   15 1735 34.38
11
12
381 106 miles to Chicago   50 3222 36.51
15
14
383 European railroad tracks   227 30.31
388 Menu   7 352 19.00
25
16
389 Use of Hospital Facilities   1 53 15.47
34
26
390 Billiard   1 903 54.53
11
21
391 Railroads   90 17.63
17
17
392 Spin   44 26.63
1
17
393 Hexagon   77 48.65
17
1
394 Alphacode   580 22983 27.42
15
15
395 Anti-prime Sequences   3 349 47.83
9
9
396 Hit or Miss   133 43.10
1
1
397 I Conduit   3 196 15.56
21
21
398 Roll Playing Games   121 14.67
34
17
399 Team Rankings   1 391 53.58
17
9
400 To and Fro   90 23449 55.58
14
7
401 Translations   137 38.07
17
34
402 Hike on a Graph   8 781 40.27
15
19
404 Scanner   59 12.57
405 Tin Cutter   141 29.59
17
17
407 Random Number   48 29.13
17
17
408 Jill Rides Again   2 971 34.26
9
9
409 DEL Command   1 79 17.60
17
17
410 Variable Radix Huffman Encoding   1 180 19.26
1
1
413 Word Puzzles   4 377 18.26
30
14
414 Equatorial Bonfire   1 79 28.90
34
17
449 Simple Numbers with Fractions Conversion   2 37 15.96
17
17
515 Collatz   1 450 43.13
1
5
518 Zig-Zag Permutation   1 51 31.25
26
26

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