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+/**%0A * Problem: https://leetcode.com/problems/missing-number/%0A */%0A%0Apublic class Solution %7B%0A    public int missingNumber(int%5B%5D nums) %7B%0A        int n = nums.length;%0A        int sum = (n) * (n + 1) / 2;%0A        for(int i=0; i%3Cn; i++) sum -= nums%5Bi%5D;%0A        return sum;%0A    %7D%0A%7D%0A

Create Missing_Number.java