[LeetCode] Find the Duplicate Number - Eason Liu - 博客园

[LeetCode] Find the Duplicate Number - Eason Liu - 博客园

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 element must exist. Assume that there is only one duplicate number, find the duplicate one.

Note:

1. You must not modify the array (assume the array is read only).
2. You must use only constant extra space.
3. Your runtime complexity should be less than O(n2).

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