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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
30755 Ada and GCD   21 458 21.95
27
15
30947 Sabbir and gifts   21 374 32.92
16
13
31040 Namit In Trouble   21 869 23.79
14
14
32245 Apoorv and Maximum Inversion   21 150 33.15
22
24
57 Supernumbers in a permutation   22 1111 33.02
17
19
203 Potholers   22 2290 26.51
16
12
227 Ordering the Soldiers   22 1478 33.31
21
23
665 String it out   22 1221 38.84
12
15
5970 Finding Primes   22 1345 27.95
16
15
6898 Substring Problem   22 851 15.19
23
23
7691 Homo or Hetero   22 1676 36.26
15
11
10442 Candy Distribution   22 3931 37.55
2
4
10537 Edit Distance Again   22 2546 42.24
4
6
15609 Spiky Mazes   22 1056 35.12
15
12
16482 Make them equal !   22 2130 52.84
3
9
20775 Roger and tree   22 343 27.78
17
22
27379 Unique Code   22 130 19.74
21
21
28740 Try to complete   22 679 25.60
23
23
32579 Ada and Expenses   22 378 51.28
10
12
35276 Smallest on the Stack   22 912 15.08
11
13
4557 Musical Chairs   23 2497 46.81
9
19
8363 COSTLY CHESS   23 1772 43.12
14
12
15285 Defend The Rohan   23 1356 43.36
6
10
15555 Check the coprimeness   23 3264 50.32
3
5
15567 Playing With Balls   23 1777 65.36
2
11
15980 Ascending Fibonacci Numbers   23 807 17.23
17
13
21853 Rivals   23 511 33.85
17
24
726 Promotion   24 2103 28.18
12
8
9756 Alaska   24 2939 35.87
5
3
10500 Haybale stacking   24 4042 34.76
9
14
10818 Medium Factorization   24 1902 14.63
19
14
13388 Easy Jug   24 2161 42.08
6
15
14955 Dancing Cows   24 597 24.92
15
22
18297 Problem4   24 541 32.38
18
20
22382 Euler Totient Function Depth   24 398 37.13
15
16
23847 Acm Teams   24 1667 40.48
2
5
26315 Crazy Smoker   24 1353 35.30
4
9
28304 Ada and Teams   24 892 39.56
15
15
235 Very Fast Multiplication   25 1362 28.09
25
21
365 Phidias   25 1226 47.23
13
21
1027 Fool the Police   25 1655 27.09
18
23
1846 Project File Dependencies   25 2150 41.10
14
15
3505 Prime Number Theorem   25 1538 28.13
14
13
3934 Recaman’s Sequence   25 3537 53.88
9
6
4164 A conjecture of Paul Erdős   25 2701 43.76
16
14
10395 Sum of divisors!   25 2384 27.07
16
18
11736 Prime Time   25 2167 48.59
11
12
18150 SHAKTIMAN AND KILWISH   25 2825 63.65
3
9
25584 Factorial Modulo   25 425 24.95
10
15
29695 GO GOA GONE   25 902 25.01
12
13

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