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fixed typo
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advanced_algorithm/backtrack.md

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@@ -92,7 +92,7 @@ class Solution:
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### [permutations](https://leetcode-cn.com/problems/permutations/)
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> 给定一个   没有重复   数字的序列,返回其所有可能的全排列。
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> 给定一个没有重复数字的序列,返回其所有可能的全排列。
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思路 1:需要记录已经选择过的元素,满足条件的结果才进行返回,需要额外 O(n) 的空间
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