Description
Given an integer array nums, return the sum of all the unique elements of nums. An element is unique if it appears exactly once.
Examples
Input:
nums = [1,2,3,2]Output:
4Explanation:
2 appears twice, so only 1 and 3 are unique. Sum = 1 + 3 = 4.
Input:
nums = [1,2,3,4,5]Output:
15Explanation:
All elements appear exactly once, so sum all: 1+2+3+4+5 = 15.
Input:
nums = [1,1,1,1]Output:
0Explanation:
No unique elements since 1 appears 4 times. Sum = 0.
Constraints
- •
1 ≤ nums.length ≤ 100 - •
-100 ≤ nums[i] ≤ 100