<ul><li>Given a collection of distinct integers, return all possible permutations.</li><li>There are three ways to solve this problem: using recursion, using next permutation, and using Heap's algorithm.</li><li>The recursive approach involves fixing each digit and reversing the other digits recursively.</li><li>The next permutation approach involves sorting the input array and generating the next higher number using the library function.</li></ul>

Given a collection of distinct integers, return all possible permutations.

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