public class Solution
extends Object
1748 - Sum of Unique Elements\.
Easy
You are given an integer array `nums`. The unique elements of an array are the elements that appear **exactly once** in the array.
Return _the **sum** of all the unique elements of_ `nums`.
**Example 1:**
**Input:** nums = [1,2,3,2]
**Output:** 4
**Explanation:** The unique elements are [1,3], and the sum is 4.
**Example 2:**
**Input:** nums = [1,1,1,1,1]
**Output:** 0
**Explanation:** There are no unique elements, and the sum is 0.
**Example 3:**
**Input:** nums = [1,2,3,4,5]
**Output:** 15
**Explanation:** The unique elements are [1,2,3,4,5], and the sum is 15.
**Constraints:**
* `1 <= nums.length <= 100`
* `1 <= nums[i] <= 100`