| from typing import List | |
| class Solution: | |
| def permute(self, nums: List[int]) -> List[List[int]]: | |
| ans = [] | |
| k = len(nums) | |
| option = [0] * k | |
| visited = [0] * k | |
| def dfs(idx: int): | |
| for i in range(k): | |
| if visited[i] == 0: | |
| option[idx] = nums[i] | |
| visited[i] = 1 | |
| if idx == k - 1: | |
| ans.append(option.copy()) | |
| else: | |
| dfs(idx + 1) | |
| visited[i] = 0 | |
| dfs(0) | |
| return ans | |