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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
22403 Divisors of factorial   71 1985 29.90
14
14
8238 N-Factorful   72 2798 26.81
18
17
288 Prime or Not   73 5484 19.33
21
22
10394 Buying Apples!   73 5618 34.87
12
14
247 Chocolate   74 5966 43.31
10
18
3749 Subset Sums   74 4226 26.67
17
20
6294 Yodaness Level   74 3576 49.31
15
16
12150 Just Next !!!   75 6670 23.13
12
11
5117 Wine trading in Gergovia   76 5445 33.78
9
12
9494 Just Add It   76 6469 46.86
11
10
18167 SubXor   76 1906 30.82
25
29
3381 Highways   77 4518 38.27
10
9
10509 Cards   78 13540 34.03
4
4
91 Two squares or not two squares   79 6097 24.70
11
14
339 Recursive Sequence   79 3842 50.30
20
17
2939 Query on a tree V   79 1925 28.78
29
30
3405 Almost Shortest Path   79 1714 31.37
22
21
154 Sweet and Sour Rock   80 3451 51.17
14
17
21357 Crucial Equation   80 6397 38.07
4
9
21524 Pattern Find   81 5065 38.73
10
13
3871 GCD Extreme   82 3109 29.36
19
26
328 Bishops   83 8988 32.04
14
7
5971 LCM Sum   83 3964 26.35
20
29
1112 Number Steps   84 34157 43.03
4
4
10232 Distinct Primes   85 5933 45.48
10
9
10401 Aliens at the train   85 4483 29.26
13
10
5295 Adjacent Bit Counts   86 3777 63.94
14
18
10380 prayatna PR   86 5303 43.08
6
6
23776 K-Query Online   86 2061 40.14
20
23
7718 Number of common divisors   87 7299 24.44
11
13
7975 Tri graphs   87 4871 29.13
11
10
130 Rent your airplane and make money   88 3389 28.65
18
17
2884 Martian Mining   89 2329 47.79
13
22
3643 Traffic Network   89 2120 18.30
18
21
7733 Happy Numbers I   89 9403 53.36
8
8
400 To and Fro   90 23449 55.58
14
7
7424 Girls and Boys   91 12347 46.95
4
10
63 Square Brackets   92 3893 56.77
14
18
694 Distinct Substrings   92 5784 26.60
21
24
3885 Coins Game   92 5500 45.26
10
13
2905 Not a Triangle   93 5052 38.67
11
11
9493 Advanced Fruits   93 2263 37.52
19
16
2416 Distinct Subsequences   94 3783 36.34
12
22
6818 Capital City   95 2975 39.59
20
20
9655 Elevator Trouble   96 4338 32.42
11
11
38 Labyrinth   98 5361 25.82
18
16
64 Permutations   98 4413 52.19
12
20
368 Cobbled streets   98 5441 50.87
13
12
181 Scuba diver   99 3911 26.08
18
18
2123 Candy I   99 29126 44.23
4
5

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