LeetCode 46: Permutations — Step-by-Step Visual...

Medium — Backtracking | Array | Recursion The Problem Given an array of distinct integers, return all possible permutations of the array elements in any order. Approach Uses backtracking with in-place swapping to generate permutations. At each position, we try placing each remaining element, recursively generate permutations for the rest, then backtrack by swapping elements back to their original positions. Time: O(n! × n) · Space: O(n) Code class Solution: def permute(self, nums: List[int]) ->