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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
8042 Possible Friends   17 1191 37.21
12
10
4993 Traveling Salesman   8 1043 37.18
14
2
7886 Boards (Hard)   40 37.14
22382 Euler Totient Function Depth   24 398 37.13
15
16
11063 AP - Complete The Series (Easy)   48 13032 37.13
3
6
26184 Colorful Beads   2 38 37.12
34
34
21965 Book Club   1 33 37.11
17
17
42546 Hu-Gi-Oh   2 45 37.11
1
1
106 Binary Stirling Numbers   3 2693 37.10
4
17
8074 God of Number Theory   1 35 37.10
34
50
20752 LAZY FRIENDS   3 40 37.09
17
13
13683 Transitive Closure   1 248 37.02
17
17
4666 Wireless   1 128 37.02
17
17
1800 Fixed Partition Contest Management   63 36.99
17
1
16480 Decrypt the message !   3 1046 36.98
8
4
3937 Wooden Sticks   9 681 36.97
23
28
8593 Covering the Corral   12 36.96
26119 Revenge of Arjuna   2 37 36.96
17
17
28604 Sinha and Eggs   6 555 36.95
5
10
26744 Coverage   27 36.94
8420 Finding Minimum   1 75 36.90
1
17
1878 Farmers Cattle   1 57 36.89
34
34
19957 GETTING AN AP   5 493 36.88
8
12
4491 Primes in GCD Table   2 862 36.88
17
26
8670 THE MAX LINES   29 8046 36.87
4
10
15074 Tourney   4 149 36.87
13
9
15551 Do You Even Lift   2 24 36.86
23
28
32951 Ada and Substring   16 430 36.86
21
23
419 Transposing is Fun   1 307 36.85
17
26
14035 Winter Crush   27 36.84
21172 Erdos et al   3 141 36.84
26
26
1868 Making Money   6 801 36.83
8
4
8418 Revenge of the squares   1 89 36.83
17
17
4456 Jumbo Airlines   2 76 36.79
34
34
4455 Going to the Movies   89 36.79
8106 Normalized Form   6 278 36.76
17
17
6286 Sum of products   11 387 36.75
19
28
31428 Fibonacci Polynomial   10 136 36.75
19
21
7630 SHOPPERS   150 36.75
8 Complete the Sequence!   32 4521 36.74
16
18
137 Partition   17 789 36.73
17
20
35363 The World of Charges   13 174 36.69
3
4
23 Pyramids   -19 5734 36.67
9
15
4420 Counting Graphs   76 36.64
9098 Long Common Subsequence   2 199 36.64
34
17
4585 Star Wars   1 76 36.63
17943 Mickey Mouse Magic Trick v3   75 36.63
15554 Niceness of the string   12 1170 36.63
7
2
19985 GCD Extreme (hard)   2 358 36.57
26
34
13738 Happy Valentine Day (Valentine Maze Game)   3 150 36.54
28
23

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