Fix backtrack time complexity (#965)

* Update backtracking/all_permutations.py
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Erfan Alimohammadi 2019-07-06 20:01:52 +04:30 committed by GitHub
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@ -2,7 +2,7 @@
In this problem, we want to determine all possible permutations
of the given sequence. We use backtracking to solve this problem.
Time complexity: O(n!),
Time complexity: O(n! * n),
where n denotes the length of the given sequence.
'''