LeetCode—permutations_combinations_permutations-sequence（全排列——DFS深度优先搜索）—java

题目描述：java Given a collection of numbers, return all possible permutations.数组 For example, [1,2,3]have the following permutations: [1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2], and[3,2,1].app 思路解析：ui https:

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