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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 1875 32.94
24
21
3979 Whirligig number   8 1030 38.01
10
15
3980 Point Visible   1 48 27.40
34
50
3981 Shortest Regular Bracket   81 33.92
3982 String problem   7 606 48.95
9
23
3983 Right Triangle Counting   3 190 17.79
30
21
3999 FROGGER   3 101 27.20
28
23
4000 GALLUP   1 68 45.86
17
34
4003 Subway planning   43 18.98
4004 Exploding CPU   139 45.77
4008 Con Voi   9 57.69
4010 Chặt cây   10 21.31
4021 Bipalindrome   183 30.77
4031 Mass of Molecule   29 2608 48.19
12
9
4033 Phone List   151 7202 31.67
16
14
4034 Pizza Delivery   53 16.55
4035 NERED   2 395 57.83
9
13
4036 Cuckoo Hashing   3 150 27.32
17
6
4038 Counting The Way of Bracket Replacement   7 439 38.83
26
21
4052 Game   75 29.27
4053 Card Sorting   26 692 43.61
22
27
4060 A game with probability   208 21.97
4061 Polygon   4 214 31.29
21
17
4062 Rob Mini-Safe   113 39.49
4063 Sell Pigs   2 463 51.30
26
42
4069 Morphing is Fun   29 18.85
4070 Two Professors   102 13.96
4082 BLAST   30 1755 51.67
8
16
4083 Tele Broadcast   67 50.26
4097 Locomotive   35 38.30
4100 Sum of Vectors   -1 102 29.34
50
34
4103 Extend to Palindrome   44 2529 30.20
16
17
4110 Fast Maximum Flow   48 2991 34.25
25
22
4141 Euler Totient Function   147 11916 38.87
8
11
4142 Ellipse   19 8.81
4154 IZBORI   36 24.54
4155 OTOCI   2 503 45.43
26
34
4156 PLAHTE   68 35.51
4157 Domino   4 53 46.69
42
42
4160 A1 Road   88 50.21
4164 A conjecture of Paul Erdős   24 2567 43.72
16
15
4166 Four colors   2 102 21.72
42
42
4168 Square-free integers   14 749 46.18
16
21
4172 Multiplicative digital root   1 74 23.83
4176 A Knightly Pursuit   2 66 29.15
26
17
4177 Herding   57 2723 35.20
14
15
4178 Distance on a square lattice   121 53.06
4179 Temptation Island   2 652 44.99
20
12

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