list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
7753 Happy Numbers II   3 651 15.95
23
17
8263 Big Pyramid   3 51 62.92
23
23
8277 Number of Prime Strings   3 112 19.95
23
28
9138 Pyramid Sums 2   2 114 33.61
23
34
9255 Publication   3 42 60.75
23
17
9547 Counting d-pairs   2 138 30.45
23
28
10405 Shooting the balloons!   11 347 36.02
23
27
10606 Balanced Numbers   9 651 29.18
23
17
11579 Two Famous Companies   3 235 22.02
23
28
11789 Aliens at the subway   2 78 18.13
23
23
12318 My Reaction when there is no internet connection   32 25.93
23
12
12352 HNumbers   2 202 27.56
23
42
13044 Dyslexic Gollum   3 124 29.11
23
28
13048 Escape from the Mines   2 69 24.27
23
23
13106 KOSARE   3 387 50.54
23
39
13925 ZEROES IN RANGE V2   2 244 37.97
23
17
14122 Inverse of Recurrence Problem With a Square Root   3 61 49.14
23
45
14823 Advanced Battleships   5 52 13.75
23
23
14862 Union Laser   3 31 47.34
23
17
15143 play with prime numbers (I)   5 35 17.68
23
23
15243 Primos Quest   1 175 38.49
23
23
15551 Do You Even Lift   2 24 36.86
23
28
15557 Partition the sticks   4 110 34.84
23
17
15914 Update Sub-Matrix & Query Sub-Matrix   2 96 35.79
23
28
17406 Cheating a Boolean Tree   5 126 35.34
23
15
17660 The Bridge to Home   5 122 36.19
23
34
18153 Robert Langdon & The Rule of Three   3 41 36.36
23
34
18458 Very Friends 2   4 40 19.45
23
23
18468 A Pleasant Stroll   10 138 35.42
23
19
19146 Glorious Gamblers   -1 141 55.52
23
26
19152 Digo Goes Training   1 240 46.18
23
17
21353 Avantgarde and Doughnut   5 23 44.87
23
31
21861 I Love Strings   3 57 18.37
23
23
21966 Ricochet Robots   3 26 50.00
23
12
22270 Periodic function, trip 2   3 38 44.65
23
28
23875 Another Version of Inversion   7 71 32.13
23
23
25048 Robot   5 82 25.91
23
28
25889 Drawing Lines   3 37 22.09
23
17
26017 GCD OF MATRIX   2 335 41.42
23
34
26954 k Alternating Sum   11 81 31.75
23
26
27218 Segmentation   6 35 41.50
23
28
27301 2D arrays with XOR property   4 18 32.00
23
39
27496 Again Eid Salami   3 129 45.57
23
34
28632 Ghost Town   11 291 41.07
23
10
30826 Bernoulli numbers   4 7 14.50
23
12
30828 Class Leader   3 217 11.57
23
28
32059 Ada and Taxes   16 113 36.48
23
23
32595 Ada and Servers   2 29 22.78
23
1
35196 Pandas are the best Lovers   6 28 47.47
23
23
36653 Blind Escape II   3 12 56.00
23
28

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