ID NAME QUALITY USERS ACC % DIFFICULTY C I
9493 Advanced Fruits   55 1467
19
16
19301 Operators (new ver)   1 23
34
17
28587 A problem of Backtracking   2 214
1
12
27182 Easy modified sudoku   4 145
17
12
17406 Cheating a Boolean Tree   4 76
17
9
31894 House Buying Optimizations   3
1538 Making Jumps   8 1051
15
11
15609 Spiky Mazes   12 250
16
14
4525 Digger Octaves   5 195
17
21
224 Vonny and her dominos   2 495
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/