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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
8869 Roti Prata   63 7452 39.47
15
17
154 Sweet and Sour Rock   80 3451 51.17
14
17
130 Rent your airplane and make money   88 3387 28.64
18
17
10 Complicated Expressions   11 1581 31.63
17
17
12 The Game of Master-Mind   1 793 44.12
17
17
26 Build the Fence   37 2268 28.14
22
17
36 Secret Code   6 553 35.34
17
17
37 The Proper Key   1 143 13.99
17
17
44 Substitution Cipher   3 341 13.83
17
17
70 Relations   2 254 28.80
9
17
73 Bacterial   1 76 18.66
50
17
77 New bricks disorder   1 290 37.79
17
17
83 Bundling   1 57 34.04
17
17
89 Hang or not to hang   1 66 15.60
17
17
99 Bus   188 22.24
34
17
107 Calendar of the Maya   5 137 44.42
21
17
108 Decoding Morse Sequences   7 973 25.04
24
17
119 Servers   116 19.59
17
17
121 Timetable   63 16.42
17
17
123 Paying in Byteland   2 479 46.72
6
17
132 Help R2-D2!   13 771 29.70
19
17
136 Transformation   83 32.18
17
17
139 The Long and Narrow Maze   1 211 20.16
17
17
140 The Loner   160 21.49
34
17
142 Johnny and the Glue   110 38.36
17
17
149 Fencing in the Sheep   3 102 12.99
34
17
160 Choosing a Palindromic Sequence   98 32.39
17
17
174 Paint templates   1 60 38.04
9
17
187 Flat broken lines   2 105 39.78
9
17
201 The Game of Polygons   1 256 39.01
1
17
207 Three-coloring of binary trees   16 887 36.10
20
17
211 Primitivus recurencis   286 27.94
1
17
234 Getting Rid of the Holidays (Act I)   100 13.81
17
17
239 Tour de Byteland   1 91 24.45
17
17
290 Polynomial Equations   66 21.91
17
17
309 The Room Pattern   1 48 14.99
34
17
329 Calls   2 129 29.63
1
17
334 The Philosophical Dispute   62 37.31
17
17
336 Exchange Operations   1 90 20.00
1
17
349 Around the world   1 91 25.66
17
17
362 Ignore the Garbage   1 425 43.75
1
17
374 Count maximum matrices   241 20.85
1
17
382 Decorate the wall   216 34.95
1
17
384 Any fool can do it   2 389 32.52
17
17
391 Railroads   90 17.63
17
17
392 Spin   44 26.63
1
17
398 Roll Playing Games   121 14.67
34
17
405 Tin Cutter   141 29.59
17
17
407 Random Number   48 29.13
17
17
409 DEL Command   1 79 17.60
17
17

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