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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
66 Cross-country   38 4062 64.48
11
12
1435 Vertex Cover   128 4031 34.10
15
18
3749 Subset Sums   74 4022 26.31
17
20
6297 Decipher   -1 3979 44.65
8
6
3921 The Great Ball   60 3927 39.10
7
11
10442 Candy Distribution   22 3912 37.52
2
4
63 Square Brackets   92 3840 56.85
14
18
9722 Insertion Sort   28 3838 30.70
12
12
1837 Pie   60 3828 30.28
18
15
10798 Wachovia Bank   58 3820 46.86
7
9
11373 Coke madness   37 3812 34.86
5
8
18164 Atoms in the Lab   32 3803 25.73
8
5
181 Scuba diver   98 3790 25.93
18
18
1684 Frequent values   111 3775 27.61
20
21
1710 Two Ends   115 3757 41.99
18
17
12448 How Many Games?   53 3730 22.41
14
12
30 Bytelandian Blingors Network   54 3723 39.08
14
10
2713 Can you answer these queries IV   60 3719 17.03
21
21
8611 Non-Decreasing Digits   71 3715 54.78
7
11
5976 Traversing Grid   30 3704 58.48
6
10
2416 Distinct Subsequences   94 3699 36.23
12
22
7299 Multiples of 3   120 3682 23.40
20
17
705 New Distinct Substrings   41 3680 26.25
26
24
7185 Bye Bye Cakes   17 3656 38.60
8
7
339 Recursive Sequence   75 3647 50.23
20
17
29 Hash it!   14 3583 24.13
14
8
237 Sums in a Triangle   -13 3570 42.40
28
10
5971 LCM Sum   81 3568 25.82
20
29
5295 Adjacent Bit Counts   86 3565 65.73
14
18
4343 Empty Boxes   26 3552 66.09
2
13
3934 Recaman’s Sequence   25 3527 53.90
9
6
6294 Yodaness Level   74 3522 49.19
15
16
2149 Biased Standings   21 3503 33.24
5
5
6694 D - Playing with Marbles   18 3494 66.72
3
5
16 Sphere in a tetrahedron   12 3485 56.38
11
16
5917 Factorial length   11 3463 34.53
5
17
10283 ALL IZZ WELL   69 3440 31.27
17
14
1029 Matrix Summation   52 3422 20.00
15
18
154 Sweet and Sour Rock   79 3407 51.34
14
17
4942 Integer Factorization (15 digits)   45 3391 32.34
11
11
11772 Negative Score   67 3376 34.31
10
11
48 Glass Beads   29 3369 37.81
15
18
130 Rent your airplane and make money   88 3339 28.59
18
17
9199 Circular Track   30 3336 40.26
7
14
13753 Amazing Prime Sequence   61 3312 29.78
11
12
1161 Tic-Tac-Toe ( I )   20 3259 22.87
12
10
11354 Amusing numbers   52 3233 59.81
13
15
15555 Check the coprimeness   23 3228 50.28
3
5
2412 Arranging Amplifiers   18 3216 27.33
7
16
41 Play on Words   42 3209 19.38
21
24

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