Python/backtracking

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/