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46. 全排列
给定一个不含重复数字的数组 nums ,返回其 所有可能的全排列 。你可以 按任意顺序 返回答案。
示例 1:
输入:nums = [1,2,3]
输出:[[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]]
示例 2:
输入:nums = [0,1]
输出:[[0,1],[1,0]]
示例 3:
输入:nums = [1]
输出:[[1]]
提示:
1 <= nums.length <= 6
-10 <= nums[i] <= 10
nums 中的所有整数 互不相同
- 来源:力扣(LeetCode)
- 链接:https://leetcode.cn/problems/permutations
javascript
/**
* @param {number[]} nums
* @return {number[][]}
*/
var permute = function (nums) {
let track = [],
res = []
backtrack(nums, track, res)
return res
}
function backtrack(nums, track, res) {
if (track.length === nums.length) {
res.push([...track])
return
}
for (let i = 0; i < nums.length; i++) {
if (track.includes(nums[i])) {
continue
}
track.push(nums[i])
backtrack(nums, track, res)
track.pop()
}
}
console.log(permute([1, 2, 3]))
console.log(permute([0, 1]))
console.log(permute([1]))