list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
3977 Police Query   8 292 17.01
27
30
3978 Distance Query   68 1711 32.34
24
21
3979 Whirligig number   7 1021 37.97
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 18.05
30
21
3999 FROGGER   3 97 27.01
28
23
4000 GALLUP   1 64 44.44
17
34
4003 Subway planning   40 18.08
4004 Exploding CPU   141 46.17
4008 Con Voi   7 62.50
4010 Chặt cây   8 40.91
4021 Bipalindrome   183 30.89
4031 Mass of Molecule   29 2569 48.03
12
9
4033 Phone List   151 6979 31.52
16
14
4034 Pizza Delivery   53 17.10
4035 NERED   2 391 57.64
9
13
4036 Cuckoo Hashing   3 151 27.58
17
6
4038 Counting The Way of Bracket Replacement   7 436 38.78
26
21
4052 Game   75 33.70
4053 Card Sorting   25 679 43.26
21
26
4060 A game with probability   193 21.22
4061 Polygon   4 210 33.08
21
17
4062 Rob Mini-Safe   111 39.21
4063 Sell Pigs   2 409 49.85
26
42
4069 Morphing is Fun   31 23.08
4070 Two Professors   101 14.41
4082 BLAST   30 1744 51.61
8
16
4083 Tele Broadcast   65 50.00
4097 Locomotive   34 44.30
4100 Sum of Vectors   -1 101 32.12
50
34
4103 Extend to Palindrome   40 2367 29.72
16
17
4110 Fast Maximum Flow   47 2824 34.33
25
22
4141 Euler Totient Function   144 11560 38.54
8
11
4142 Ellipse   17 8.46
4154 IZBORI   36 24.54
4155 OTOCI   2 464 44.81
26
34
4156 PLAHTE   63 36.00
4157 Domino   4 54 50.42
42
42
4160 A1 Road   86 50.46
4164 A conjecture of Paul Erdős   23 2150 44.54
16
14
4166 Four colors   1 100 21.88
50
50
4168 Square-free integers   13 637 44.16
13
19
4172 Multiplicative digital root   1 73 25.40
4176 A Knightly Pursuit   2 63 27.56
26
17
4177 Herding   57 2707 35.23
14
15
4178 Distance on a square lattice   122 54.32
4179 Temptation Island   2 648 44.85
20
12
4180 Pizza Location   2 571 18.48
31
17

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