You are given an integer array nums. The unique elements of an array are the elements that appear exactly once in that array.

Return the sum of all unique elements in nums.

Constraints:

• $1 \le$ nums.length $\le 100$

• $1 \le$ nums[i] $\le 100$

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We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.