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. 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). Feb 5, 2026 · Learn LeetCode 46 Permutations in Java with backtracking and in place swapping, recursion, time and space complexity, and their interview use
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