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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
4177 Herding   57 2731 35.22
14
15
7150 Palindrome 2000   57 3304 27.64
14
14
8061 Christmas Play   57 7793 48.26
6
4
348 Expedition   58 2265 20.73
20
20
3878 Rectangles Perimeter   58 2702 49.87
12
14
7208 Black or White   58 1482 42.45
16
19
22393 KATHTHI   58 2217 33.43
16
17
3693 Maximum Sum   59 6628 42.45
19
18
10798 Wachovia Bank   59 4065 46.73
7
8
30738 Ada and Coins   59 867 31.89
14
22
1837 Pie   60 4135 30.46
18
15
2530 Tiling a Grid With Dominoes   60 2440 64.85
16
24
2713 Can you answer these queries IV   60 4393 17.76
21
21
2906 GCD2   60 6869 36.48
12
11
3921 The Great Ball   60 3951 39.19
7
11
10514 K12 - Building Construction   60 2073 26.48
12
16
12933 n-divisors   60 2340 19.39
18
17
15965 PLAY WITH MATH   60 6904 46.49
4
5
18284 Petya and the Road Repairs   60 892 24.02
19
22
28305 Ada and Indexing   60 2365 43.02
15
15
1028 Hubulullu   61 8257 58.72
2
15
18155 abs(a-b) I   61 4701 47.92
5
9
22776 Balika Vadhu and Alok Nath   61 1203 33.53
14
18
7386 Activities   62 1447 25.57
16
19
9734 Hacking the random number generator   62 5885 39.03
8
6
11372 Blueberries   62 2251 33.64
12
13
13753 Amazing Prime Sequence   62 3362 29.93
10
12
27307 Alternating Sequences   62 2127 32.62
8
9
8869 Roti Prata   63 7452 39.47
15
17
10628 Count on a tree   63 2641 17.44
32
31
1296 4 values whose sum is 0   64 5121 24.92
18
14
11516 VALIDATE THE MAZE   64 3184 32.23
11
8
21326 Akbar , The great   64 2733 16.05
21
17
138 Election Posters   65 2343 25.84
20
21
35674 COLORFUL ARRAY   65 1789 41.38
20
21
9032 Cube Free Numbers   66 4167 31.77
12
11
503 Prime Intervals   67 1827 16.14
21
19
9788 Friends of Friends   67 7149 63.27
7
5
11772 Negative Score   67 3451 34.17
10
11
78 Marbles   68 8234 34.99
15
13
1108 Card Trick   68 2247 50.40
21
24
1724 Counting Triangles   69 13198 33.99
7
21
7588 Wise And Miser   70 5522 67.30
8
10
10283 ALL IZZ WELL   70 3493 31.36
17
14
10707 Count on a tree II   70 3562 19.62
31
30
11404 Save Thy Toys   70 2831 30.19
12
15
379 Ambiguous Permutations   71 12377 59.61
4
5
3978 Distance Query   71 1954 33.24
24
21
6471 Printing some primes   71 7837 28.91
13
11
8611 Non-Decreasing Digits   71 3733 54.84
7
11

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