$ cat ./coding/46-permutations.md

────────────────────────────────────────────────────────────

46. Permutations

class Solution:
    def permute(self, nums: List[int]) -> List[List[int]]:
        
        res = []

        def helper(curr, visited):
            if len(curr) == len(nums):
                res.append(list(curr))
                return
            
            for i in range(len(nums)):
                if i in visited:
                    continue
                num = nums[i]
                curr.append(num)
                visited.add(i)
                helper(curr, visited)
                visited.remove(i)
                curr.pop()
        
        helper([], set())

        return res

$ ls ./coding/ | grep -v 46-permutations