0961. N-Repeated Element in Size 2N Array

https://leetcode.com/problems/n-repeated-element-in-size-2n-array

Description

You are given an integer array nums with the following properties:

• nums.length == 2 * n.

• nums contains n + 1 unique elements.

• Exactly one element of nums is repeated n times.

Return the element that is repeated n times.

Example 1:

**Input:** nums = [1,2,3,3]
**Output:** 3

Example 2:

**Input:** nums = [2,1,2,5,3,2]
**Output:** 2

Example 3:

**Input:** nums = [5,1,5,2,5,3,5,4]
**Output:** 5

Constraints:

• 2 <= n <= 5000

• nums.length == 2 * n

• 0 <= nums[i] <= 104

• nums contains n + 1 unique elements and one of them is repeated exactly n times.

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