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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
3195 Doors and Penguins   9 244 27.35
19
16
3261 Race Against Time   38 1181 24.86
21
21
3305 Roman Patrollers   53 59.35
3306 Very Special Boxes   114 31.96
9
26
3314 Umnozak   115 30.02
42
17
3347 Cestarine   64 29.10
3374 Scavenger Hunt   10 1375 50.52
9
10
3375 Stamps   29 13789 41.72
5
3
3376 Parking Lot   1 143 20.40
17
17
3385 Yoda Goes Palindromic !   3 586 30.53
17
17
3393 Knot or Not   10 16.67
3394 Lagrange’s Four-Square Theorem   4 532 46.08
1
9
3412 Higgs Boson   52 19.09
3442 The last digit   190 30125 26.99
9
8
3464 Clock   3 66 36.47
34
9
3466 Another Longest Common Subsequence Problem   6 5.66
3543 Matrica   56 39.90
3544 Binary Search Tree   6 611 21.01
11
20
3545 Najkraci   6 188 28.92
28
34
3591 Patting Heads   3 659 35.33
17
17
3605 Minimum Rotations   15 921 19.12
15
21
3640 Hanoi Subway System Construction   36 40.78
3723 Snooker   5 460 50.55
9
27
3734 Periodni   2 670 39.19
26
34
3749 Subset Sums   74 4226 26.67
17
20
3752 JEDNAKOST   12 601 18.45
23
21
3753 GONDOR   4 395 53.39
13
13
3754 MAJMUN   1 77 40.47
17
17
3763 George   15 528 52.53
19
18
3791 Street   8 669 51.43
10
13
3877 Cvjetici   18 986 48.67
12
21
3882 Cijevi   5 261 38.20
30
14
3898 Even Palindrome   -1 251 10.23
3931 Maximum Triangle Area   2 283 29.27
5
28
3946 K-th Number   245 5840 35.44
25
27
3953 Paid Roads   8 261 27.57
19
26
3961 Journey with Pigs   133 41.31
3962 ELEVATOR II   2 101 43.31
9
26
3975 Most Servings Meal   8 354 26.37
28
28
3977 Police Query   8 302 17.37
27
30
4010 Chặt cây   11 22.58
4070 Two Professors   104 14.10
4103 Extend to Palindrome   44 2591 30.60
16
17
4110 Fast Maximum Flow   48 3063 34.32
25
22
4157 Domino   4 56 49.80
42
42
4164 A conjecture of Paul Erdős   25 2699 43.75
16
14
4166 Four colors   2 104 22.01
42
42
4168 Square-free integers   14 788 46.27
16
21
4172 Multiplicative digital root   1 77 24.07
4176 A Knightly Pursuit   2 67 29.28
26
17

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