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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
4203 Double Queue   1 76 43.72
17
17
4202 Brackets Parade   232 44.26
4201 Coder Ratings   26 1386 35.98
15
18
4200 Hamster flight   13 1149 45.39
5
13
4198 Lego   5 175 25.25
24
22
4197 Dominoes   4 119 22.89
23
23
4195 GCD Determinant   1 263 45.60
1
34
4194 Another Lucky Numbers   4 136 33.45
17
13
4191 Sky Code   12 614 27.25
19
26
4189 Landing   4 3.64
4188 Amazing equality   38 13.58
4186 Break a New RSA system   1 137 35.76
4185 Cube   52 35.93
4182 Candy (Again)   2 226 18.48
34
34
4181 MELE3   19 610 42.62
20
21
4180 Pizza Location   2 571 18.49
31
17
4179 Temptation Island   2 648 44.85
20
12
4178 Distance on a square lattice   122 54.32
4177 Herding   56 2698 35.21
14
15
4176 A Knightly Pursuit   2 63 27.56
26
17
4172 Multiplicative digital root   1 73 25.40
4168 Square-free integers   13 620 43.97
13
19
4166 Four colors   1 100 21.88
50
50
4164 A conjecture of Paul ErdÅ‘s   23 2106 44.46
16
14
4160 A1 Road   86 50.46
4157 Domino   4 54 50.42
42
42
4156 PLAHTE   63 36.00
4155 OTOCI   2 456 44.80
26
34
4154 IZBORI   36 24.54
4142 Ellipse   17 8.46
4141 Euler Totient Function   144 11478 38.47
8
11
4110 Fast Maximum Flow   47 2806 34.29
25
22
4103 Extend to Palindrome   40 2343 29.63
16
17
4100 Sum of Vectors   -1 101 32.12
50
34
4097 Locomotive   34 44.30
4083 Tele Broadcast   65 50.00
4082 BLAST   30 1743 51.61
8
16
4070 Two Professors   101 14.47
4069 Morphing is Fun   31 23.08
4063 Sell Pigs   2 397 49.41
26
42
4062 Rob Mini-Safe   111 39.21
4061 Polygon   4 210 33.46
21
17
4060 A game with probability   189 21.14
4053 Card Sorting   25 678 43.21
21
26
4052 Game   75 33.70
4038 Counting The Way of Bracket Replacement   7 435 38.74
26
21
4036 Cuckoo Hashing   3 151 27.58
17
6
4035 NERED   2 391 57.64
9
13
4034 Pizza Delivery   53 17.10
4033 Phone List   151 6895 31.47
16
14

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