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* Create combination_sum.py * Update DIRECTORY.md * Adds doctests Co-authored-by: Christian Clauss <cclauss@me.com> * Update combination_sum.py * Update combination_sum.py Co-authored-by: Christian Clauss <cclauss@me.com>
Backtracking
Backtracking is a way to speed up the search process by removing candidates when they can't be the solution of a problem.