# Backtracking
Backtracking is a way to speed up the search process by removing candidates when they can't be the solution of a problem.
* <https://en.wikipedia.org/wiki/Backtracking>
* <https://en.wikipedia.org/wiki/Decision_tree_pruning>
* <https://medium.com/@priyankmistry1999/backtracking-sudoku-6e4439e4825c>
* <https://www.geeksforgeeks.org/sudoku-backtracking-7/>
backtracking.zip （17个子文件） 
backtracking 
__init__.py 0B sum_of_subsets.py 2KB minimax.py 2KB all_combinations.py 1KB all_permutations.py 1KB coloring.py 3KB minmax.py 2KB rat_in_maze.py 3KB hamiltonian_cycle.py 6KB sudoku.py 4KB combination_sum.py 2KB word_search.py 5KB n_queens_math.py 5KB README.md 374B knight_tour.py 2KB all_subsequences.py 1KB n_queens.py 3KB资源评论
