Web Reference: In-depth solution and explanation for LeetCode 287. Find the Duplicate Number in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. 287. Find the Duplicate Number Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. Assume that there is only one duplicate number, find the duplicate one. Example 1: Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. There is only one repeated number in nums, return this repeated number. You must solve the problem without modifying the array nums and using only constant extra space. Example 1: Output: 2. Example 2: Output: 3. Example 3: Output: 3.
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