Web Reference: Single Number - Given a non-empty array of integers nums, every element appears twice except for one. Find that single one. You must implement a solution with a linear runtime complexity and use only constant extra space. In-depth solution and explanation for LeetCode 136. Single Number in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. We are given an array where every number appears exactly twice except one, and we need to find that unique number. This problem is a perfect fit for bit manipulation, specifically the XOR (^) operation.
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