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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
89 Hang or not to hang   1 66 15.60
17
17
109 Exchanges   1 130 43.31
34
112 Horizontally Visible Segments   1 162 27.39
17
34
134 Phony Primes   1 183 19.22
23
23
135 Men at work   1 268 38.56
24
26
139 The Long and Narrow Maze   1 211 20.16
17
17
150 Where to Drink the Plonk?   1 508 35.63
174 Paint templates   1 60 38.04
9
17
177 AB-words   1 16 1.20
50
50
180 How to pack containers   1 108 36.13
1
1
182 Window   1 50 30.62
17
34
184 Automatic Teller Machines   1 212 34.19
1
1
186 The lightest language   1 184 26.33
17
34
200 Monodigital Representations   1 168 30.27
26
26
201 The Game of Polygons   1 256 39.01
1
17
226 Jewelry and Fashion   1 20 26.36
34
50
229 Sorting is easy   1 118 18.11
17
1
231 The Zebra Crossing   1 29 10.90
239 Tour de Byteland   1 91 24.45
17
17
262 Connections   1 114 28.93
34
34
286 Selfish Cities   1 711 39.03
31
31
291 Cube Root   1 255 16.67
23
15
292 Alibaba   1 187 23.39
303 The Unstable Cube   1 51 28.10
17
1
309 The Room Pattern   1 48 14.99
34
17
336 Exchange Operations   1 90 20.00
1
17
349 Around the world   1 91 25.66
17
17
350 Landscaping   1 99 30.08
362 Ignore the Garbage   1 425 43.75
1
17
366 Farmer   1 271 17.10
1
1
387 Travelling tours   1 312 53.92
30
34
389 Use of Hospital Facilities   1 53 15.47
34
26
390 Billiard   1 903 54.53
11
21
399 Team Rankings   1 391 53.58
17
9
409 DEL Command   1 79 17.60
17
17
410 Variable Radix Huffman Encoding   1 180 19.26
1
1
414 Equatorial Bonfire   1 79 28.90
34
17
419 Transposing is Fun   1 307 36.85
17
26
479 Permutation generator   1 135 28.24
21
17
515 Collatz   1 450 43.13
1
5
518 Zig-Zag Permutation   1 51 31.25
26
26
684 Another Assignment Problem   1 107 12.48
34
1
695 Unite Fast   1 138 27.81
9
9
696 Truth or not   1 275 22.00
1
1
698 Plane Hopping   1 289 25.31
17
699 Huge Knap Sack   1 141 25.06
9
9
733 Mountain Walking   1 765 25.67
34
26
735 Minimum Diameter Spanning Tree   1 199 34.41
17
30
738 Another Counting Problem   1 235 40.65
1
1
912 Submatrix of submatrix   1 174 27.01
34
17

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