ID NAME QUALITY USERS ACC % DIFFICULTY C I
9493 Advanced Fruits   58 1544
19
16
19301 Operators (new ver)   1 25
42
17
28587 A problem of Backtracking   3 241
1
12
27182 Easy modified sudoku   4 166
17
12
17406 Cheating a Boolean Tree   4 77
17
9
31894 House Buying Optimizations   3
1538 Making Jumps   10 1090
16
12
15609 Spiky Mazes   14 301
16
14
4525 Digger Octaves   5 204
17
21
224 Vonny and her dominos   2 514
1
1

#backtracking

Backtracking is a general algorithm for finding all (or some) solutions to a computational problem that incrementally builds candidates to the solutions, and abandons (backtracks) each partial candidate as soon as it is able to determine that it cannot be completed to a valid solution

https://en.wikipedia.org/wiki/Backtracking http://web.cse.ohio-state.edu/~gurari/course/cis680/cis680Ch19.html - backtracking algorithms http://www.geeksforgeeks.org/tag/backtracking/