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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
3975 Most Servings Meal   8 353 26.30
28
28
3977 Police Query   8 298 17.31
27
30
3978 Distance Query   70 1820 32.87
24
21
3979 Whirligig number   8 1030 38.01
10
15
3980 Point Visible   1 49 32.22
34
50
3981 Shortest Regular Bracket   80 35.45
3982 String problem   7 604 48.91
9
23
3983 Right Triangle Counting   3 189 17.92
30
21
3999 FROGGER   3 100 27.33
28
23
4000 GALLUP   1 67 45.51
17
34
4003 Subway planning   42 18.38
4004 Exploding CPU   141 46.17
4008 Con Voi   9 57.69
4010 Chặt cây   9 38.71
4021 Bipalindrome   183 30.81
4031 Mass of Molecule   29 2603 48.13
12
9
4033 Phone List   151 7162 31.62
16
14
4034 Pizza Delivery   52 16.47
4035 NERED   2 394 57.72
9
13
4036 Cuckoo Hashing   3 149 27.02
17
6
4038 Counting The Way of Bracket Replacement   7 437 38.79
26
21
4052 Game   75 30.09
4053 Card Sorting   26 689 43.56
22
27
4060 A game with probability   207 21.86
4061 Polygon   4 214 31.29
21
17
4062 Rob Mini-Safe   112 39.35
4063 Sell Pigs   2 458 51.22
26
42
4069 Morphing is Fun   29 20.22
4070 Two Professors   102 14.23
4082 BLAST   30 1749 51.61
8
16
4083 Tele Broadcast   67 50.52
4097 Locomotive   34 41.18
4100 Sum of Vectors   -1 101 31.00
50
34
4103 Extend to Palindrome   43 2497 30.07
16
17
4110 Fast Maximum Flow   48 2947 34.25
25
22
4141 Euler Totient Function   147 11845 38.82
8
11
4142 Ellipse   17 8.41
4154 IZBORI   36 24.54
4155 OTOCI   2 494 45.49
26
34
4156 PLAHTE   66 36.32
4157 Domino   4 54 50.42
42
42
4160 A1 Road   87 50.68
4164 A conjecture of Paul Erdős   24 2497 43.91
16
15
4166 Four colors   2 102 22.05
42
42
4168 Square-free integers   13 727 45.30
14
20
4172 Multiplicative digital root   1 73 25.25
4176 A Knightly Pursuit   2 64 28.03
26
17
4177 Herding   57 2715 35.23
14
15
4178 Distance on a square lattice   121 53.50
4179 Temptation Island   2 649 44.86
20
12

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