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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   8 302 17.37
27
30
3978 Distance Query   71 1936 33.15
24
21
3979 Whirligig number   8 1030 38.07
10
15
3980 Point Visible   1 48 27.40
34
50
3981 Shortest Regular Bracket   82 33.78
3982 String problem   7 608 48.82
9
23
3983 Right Triangle Counting   3 190 17.72
30
21
3999 FROGGER   3 104 26.72
28
23
4000 GALLUP   1 70 46.54
17
34
4003 Subway planning   43 18.98
4004 Exploding CPU   146 46.49
4008 Con Voi   9 57.69
4010 Chặt cây   10 21.31
4021 Bipalindrome   183 30.77
4031 Mass of Molecule   29 2610 48.18
12
9
4033 Phone List   151 7314 31.83
16
14
4034 Pizza Delivery   53 16.55
4035 NERED   2 395 57.76
9
13
4036 Cuckoo Hashing   3 152 27.39
17
6
4038 Counting The Way of Bracket Replacement   7 440 38.82
26
21
4052 Game   75 29.27
4053 Card Sorting   26 694 43.65
22
27
4060 A game with probability   209 22.09
4061 Polygon   4 215 31.41
21
17
4062 Rob Mini-Safe   114 39.46
4063 Sell Pigs   2 474 51.81
26
42
4069 Morphing is Fun   29 16.07
4070 Two Professors   102 13.96
4082 BLAST   30 1759 51.71
9
16
4083 Tele Broadcast   67 50.26
4097 Locomotive   35 38.30
4100 Sum of Vectors   -1 103 29.60
50
34
4103 Extend to Palindrome   44 2573 30.47
16
17
4110 Fast Maximum Flow   48 3041 34.24
25
22
4141 Euler Totient Function   147 11990 38.95
8
11
4142 Ellipse   20 9.13
4154 IZBORI   41 26.40
4155 OTOCI   2 511 45.40
26
34
4156 PLAHTE   68 35.51
4157 Domino   4 56 49.80
42
42
4160 A1 Road   89 50.90
4164 A conjecture of Paul Erdős   24 2645 43.73
16
15
4166 Four colors   2 104 22.01
42
42
4168 Square-free integers   14 777 46.31
16
21
4172 Multiplicative digital root   1 77 24.16
4176 A Knightly Pursuit   2 67 29.28
26
17
4177 Herding   57 2727 35.20
14
15
4178 Distance on a square lattice   130 54.41
4179 Temptation Island   2 654 45.05
20
12

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