ID NAME QUALITY USERS ACC % DIFFICULTY C I
9493 Advanced Fruits   39 1263
19
17
19301 Operators (new ver)   1 22
34
17
28587 A problem of Backtracking   2 195
1
9
27182 Easy modified sudoku   3 112
17
17
17406 Cheating a Boolean Tree   2 66
17
9
31894 House Buying Optimizations   1
1538 Making Jumps   6 962
15
10
15609 Spiky Mazes   10 170
17
13
4525 Digger Octaves   4 179
17
21
224 Vonny and her dominos   2 451
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/