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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
4038 Counting The Way of Bracket Replacement   7 442 38.74
26
21
4052 Game   75 29.27
4053 Card Sorting   26 696 43.66
22
27
4060 A game with probability   210 22.15
4061 Polygon   4 215 31.41
21
17
4062 Rob Mini-Safe   114 39.46
4063 Sell Pigs   2 481 52.19
26
42
4069 Morphing is Fun   29 16.07
4070 Two Professors   104 14.10
4082 BLAST   30 1761 51.74
9
16
4083 Tele Broadcast   67 50.26
4097 Locomotive   35 37.89
4100 Sum of Vectors   -1 103 29.60
50
34
4103 Extend to Palindrome   44 2589 30.60
16
17
4110 Fast Maximum Flow   48 3061 34.31
25
22
4141 Euler Totient Function   147 12033 39.03
8
11
4142 Ellipse   21 9.46
4154 IZBORI   42 26.67
4155 OTOCI   2 512 45.42
26
34
4156 PLAHTE   69 35.77
4157 Domino   4 56 49.80
42
42
4160 A1 Road   89 50.90
4164 A conjecture of Paul ErdÅ‘s   25 2688 43.79
16
14
4166 Four colors   2 104 22.01
42
42
4168 Square-free integers   14 787 46.25
16
21
4176 A Knightly Pursuit   2 67 29.28
26
17
4177 Herding   57 2730 35.22
14
15
4179 Temptation Island   2 655 45.09
20
12
4180 Pizza Location   2 577 18.60
31
17
4181 MELE3   19 617 42.70
20
21
4182 Candy (Again)   2 236 18.78
34
34
4185 Cube   57 35.57
4186 Break a New RSA system   1 138 34.12
4188 Amazing equality   42 13.88
4189 Landing   1 8 4.08
50
50
4191 Sky Code   13 777 29.60
19
26
4194 Another Lucky Numbers   4 142 33.44
17
13
4195 GCD Determinant   1 273 45.30
1
34
4197 Dominoes   4 125 23.08
23
23
4198 Lego   5 195 25.35
24
22
4200 Hamster flight   13 1160 45.54
5
13
4201 Coder Ratings   26 1397 35.83
15
18
4202 Brackets Parade   238 45.03
4203 Double Queue   1 84 41.38
17
17
4204 Showstopper   1 89 22.45
17
34
4206 Fast Maximum Matching   33 2091 29.47
22
19
4210 Fast Maximum Matching   19 48.08
4211 Fast Maximum Flow   21 24.62
4212 Another Longest Increasing Subsequence Problem   14 42.50
4225 Payment System   31 61.90

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