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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
4227 "Shortest" pair of paths   3 214 41.11
23
17
4226 Japan   30 1803 23.39
16
19
4225 Payment System   31 61.90
4212 Another Longest Increasing Subsequence Problem   14 42.50
4211 Fast Maximum Flow   21 24.62
4210 Fast Maximum Matching   19 48.08
4206 Fast Maximum Matching   33 2089 29.46
22
19
4204 Showstopper   1 89 22.45
17
34
4203 Double Queue   1 84 41.38
17
17
4202 Brackets Parade   238 45.03
4201 Coder Ratings   26 1397 35.83
15
18
4200 Hamster flight   13 1160 45.54
5
13
4198 Lego   5 195 25.40
24
22
4197 Dominoes   4 125 23.08
23
23
4195 GCD Determinant   1 273 45.30
1
34
4194 Another Lucky Numbers   4 142 33.44
17
13
4191 Sky Code   13 777 29.60
19
26
4189 Landing   1 8 4.08
50
50
4188 Amazing equality   42 13.88
4186 Break a New RSA system   1 138 34.12
4185 Cube   57 35.57
4182 Candy (Again)   2 236 18.78
34
34
4181 MELE3   19 617 42.70
20
21
4180 Pizza Location   2 577 18.60
31
17
4179 Temptation Island   2 655 45.09
20
12
4178 Distance on a square lattice   130 54.41
4177 Herding   57 2730 35.22
14
15
4176 A Knightly Pursuit   2 67 29.28
26
17
4172 Multiplicative digital root   1 77 24.16
4168 Square-free integers   14 787 46.25
16
21
4166 Four colors   2 104 22.01
42
42
4164 A conjecture of Paul ErdÅ‘s   25 2680 43.76
16
14
4160 A1 Road   89 50.90
4157 Domino   4 56 49.80
42
42
4156 PLAHTE   69 35.77
4155 OTOCI   2 512 45.42
26
34
4154 IZBORI   42 26.67
4142 Ellipse   21 9.46
4141 Euler Totient Function   147 12029 39.02
8
11
4110 Fast Maximum Flow   48 3057 34.28
25
22
4103 Extend to Palindrome   44 2588 30.59
16
17
4100 Sum of Vectors   -1 103 29.60
50
34
4097 Locomotive   35 38.30
4083 Tele Broadcast   67 50.26
4082 BLAST   30 1761 51.74
9
16
4070 Two Professors   104 14.10
4069 Morphing is Fun   29 16.07
4063 Sell Pigs   2 481 52.19
26
42
4062 Rob Mini-Safe   114 39.46
4061 Polygon   4 215 31.41
21
17

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