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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
3975 Most Servings Meal   8 350 26.37
28
28
3977 Police Query   8 294 17.20
27
30
3978 Distance Query   70 1769 32.72
24
21
3979 Whirligig number   8 1029 37.99
10
15
3980 Point Visible   1 49 32.22
34
50
3981 Shortest Regular Bracket   79 35.74
3982 String problem   7 604 48.95
9
23
3983 Right Triangle Counting   3 189 18.00
30
21
3999 FROGGER   3 98 27.09
28
23
4000 GALLUP   1 64 44.44
17
34
4003 Subway planning   40 17.94
4004 Exploding CPU   141 46.17
4008 Con Voi   9 56.00
4010 Chặt cây   8 36.00
4021 Bipalindrome   183 30.81
4031 Mass of Molecule   29 2574 48.05
12
9
4033 Phone List   151 7060 31.58
16
14
4034 Pizza Delivery   52 16.59
4035 NERED   2 391 57.64
9
13
4036 Cuckoo Hashing   3 151 27.58
17
6
4038 Counting The Way of Bracket Replacement   7 437 38.79
26
21
4052 Game   73 32.72
4053 Card Sorting   26 688 43.52
22
27
4060 A game with probability   200 21.88
4061 Polygon   4 211 31.94
21
17
4062 Rob Mini-Safe   112 39.35
4063 Sell Pigs   2 433 50.66
26
42
4069 Morphing is Fun   29 20.57
4070 Two Professors   101 14.34
4082 BLAST   30 1746 51.62
8
16
4083 Tele Broadcast   67 50.52
4097 Locomotive   34 44.30
4100 Sum of Vectors   -1 101 31.23
50
34
4103 Extend to Palindrome   41 2435 29.97
16
17
4110 Fast Maximum Flow   48 2885 34.23
25
22
4141 Euler Totient Function   145 11689 38.66
8
11
4142 Ellipse   17 8.46
4154 IZBORI   36 24.54
4155 OTOCI   2 479 45.31
26
34
4156 PLAHTE   65 36.36
4157 Domino   4 54 50.42
42
42
4160 A1 Road   86 50.46
4164 A conjecture of Paul Erdős   23 2311 44.07
16
14
4166 Four colors   1 99 21.79
50
50
4168 Square-free integers   13 682 44.75
14
20
4172 Multiplicative digital root   1 73 25.40
4176 A Knightly Pursuit   2 64 28.03
26
17
4177 Herding   57 2714 35.23
14
15
4178 Distance on a square lattice   121 53.50
4179 Temptation Island   2 649 44.88
20
12

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