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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
66 Cross-country   38 4053 64.52
11
12
1435 Vertex Cover   128 4015 34.07
15
18
3749 Subset Sums   73 3996 26.28
17
20
6297 Decipher   -1 3975 44.65
8
6
3921 The Great Ball   60 3922 39.08
7
11
10442 Candy Distribution   22 3910 37.53
2
4
63 Square Brackets   92 3834 56.89
14
18
9722 Insertion Sort   28 3821 30.68
12
12
11373 Coke madness   37 3800 34.87
5
8
10798 Wachovia Bank   58 3798 46.92
7
9
18164 Atoms in the Lab   32 3796 25.74
8
5
1837 Pie   60 3786 30.36
18
15
181 Scuba diver   98 3781 25.94
18
18
1710 Two Ends   115 3755 42.27
18
17
1684 Frequent values   111 3747 27.70
20
21
12448 How Many Games?   54 3718 22.45
14
12
8611 Non-Decreasing Digits   71 3714 54.78
7
11
30 Bytelandian Blingors Network   54 3710 39.02
14
10
5976 Traversing Grid   30 3704 58.49
6
10
2416 Distinct Subsequences   94 3686 36.20
12
22
7299 Multiples of 3   120 3669 23.36
20
17
705 New Distinct Substrings   41 3659 26.18
26
24
7185 Bye Bye Cakes   17 3654 38.60
8
7
2713 Can you answer these queries IV   59 3641 16.90
21
21
339 Recursive Sequence   75 3603 50.08
20
17
237 Sums in a Triangle   -13 3567 42.39
28
10
29 Hash it!   14 3548 24.17
14
8
4343 Empty Boxes   26 3545 66.05
2
13
5295 Adjacent Bit Counts   86 3535 65.95
14
18
3934 Recaman’s Sequence   25 3526 53.89
9
6
5971 LCM Sum   80 3512 25.72
20
29
6294 Yodaness Level   74 3512 49.20
15
16
6694 D - Playing with Marbles   18 3491 66.82
3
5
16 Sphere in a tetrahedron   12 3475 56.51
11
16
2149 Biased Standings   21 3469 33.28
5
5
5917 Factorial length   11 3462 34.54
5
17
10283 ALL IZZ WELL   69 3418 31.23
17
14
1029 Matrix Summation   52 3413 19.99
15
18
154 Sweet and Sour Rock   79 3400 51.43
14
17
11772 Negative Score   67 3367 34.29
10
11
4942 Integer Factorization (15 digits)   45 3362 32.29
11
11
48 Glass Beads   27 3347 37.77
15
17
9199 Circular Track   30 3336 40.26
7
14
130 Rent your airplane and make money   88 3335 28.63
18
17
13753 Amazing Prime Sequence   61 3300 29.76
11
12
11354 Amusing numbers   52 3230 59.87
13
15
15555 Check the coprimeness   23 3224 50.26
3
5
1161 Tic-Tac-Toe ( I )   20 3219 22.85
12
10
41 Play on Words   42 3201 19.38
21
24
2412 Arranging Amplifiers   18 3201 27.31
7
16

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