Given a collection of distinct numbers, return all possible permutations.
For example,
[1,2,3]have the following permutations:
[ [1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1,2], [3,2,1] ]
backtracking 子串长度够了就加到返回list 里， 始终从0开始扫描， 如果子串里含有当前数字， 则继续，不递归， 否则将当前值加入到子串中，递归，回溯。
原题： 47. Permutations II 46. Permutations 初级版：46. Given a ...
46. Permutations Given a collection of distinct numbers, ...
46. Permutations Given a collection of distinct numbers, ...
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题目 46. 全排列[https://leetcode-cn.com/problems/permutations/...
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46.全排列 https://leetcode-cn.com/problems/permutations/[htt...
本文标题：46. Permutations
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