Web Reference: In-depth solution and explanation for LeetCode 46. Permutations in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. Permutations - Given an array nums of distinct integers, return all the possible permutations. You can return the answer in any order. We can use backtracking to explore all possible permutation paths. We initialize a temporary list to append the chosen elements and a boolean array of size n (the same size as the input array) to track which elements have been picked so far (true means the element is chosen; otherwise, false).
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