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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
3975 Most Servings Meal   8 354 26.38
28
28
3977 Police Query   8 300 17.36
27
30
3978 Distance Query   70 1864 32.85
24
21
3979 Whirligig number   8 1030 38.01
10
15
3980 Point Visible   1 48 27.54
34
50
3981 Shortest Regular Bracket   81 33.92
3982 String problem   7 606 48.95
9
23
3983 Right Triangle Counting   3 189 17.79
30
21
3999 FROGGER   3 101 27.25
28
23
4000 GALLUP   1 67 45.51
17
34
4003 Subway planning   43 18.98
4004 Exploding CPU   139 45.77
4008 Con Voi   9 57.69
4010 Chặt cây   10 26.53
4021 Bipalindrome   183 30.77
4031 Mass of Molecule   29 2604 48.14
12
9
4033 Phone List   151 7190 31.66
16
14
4034 Pizza Delivery   53 16.55
4035 NERED   2 394 57.72
9
13
4036 Cuckoo Hashing   3 150 27.32
17
6
4038 Counting The Way of Bracket Replacement   7 438 38.79
26
21
4052 Game   75 29.63
4053 Card Sorting   26 690 43.58
22
27
4060 A game with probability   208 22.14
4061 Polygon   4 214 31.29
21
17
4062 Rob Mini-Safe   113 39.49
4063 Sell Pigs   2 461 51.30
26
42
4069 Morphing is Fun   29 19.57
4070 Two Professors   103 14.35
4082 BLAST   30 1754 51.66
8
16
4083 Tele Broadcast   67 50.52
4097 Locomotive   35 38.30
4100 Sum of Vectors   -1 102 29.69
50
34
4103 Extend to Palindrome   44 2521 30.16
16
17
4110 Fast Maximum Flow   48 2981 34.25
25
22
4141 Euler Totient Function   147 11885 38.83
8
11
4142 Ellipse   17 8.37
4154 IZBORI   36 24.54
4155 OTOCI   2 502 45.59
26
34
4156 PLAHTE   68 36.25
4157 Domino   4 53 46.69
42
42
4160 A1 Road   88 50.21
4164 A conjecture of Paul Erdős   24 2535 43.83
16
15
4166 Four colors   2 102 21.84
42
42
4168 Square-free integers   14 746 45.66
16
21
4172 Multiplicative digital root   1 73 24.28
4176 A Knightly Pursuit   2 65 28.25
26
17
4177 Herding   57 2716 35.24
14
15
4178 Distance on a square lattice   121 53.06
4179 Temptation Island   2 651 44.96
20
12

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