268. Missing Number

Question: 268. Missing Number
Link: https://leetcode.com/problems/missing-number/

Soltuion:

class Solution {
public:
    int missingNumber(vector<int>& nums) {
        int n=nums.size();
        int sum1= (n*(n+1))/2;
        int sum2=0;
        for(int i=0;i<n;i++){
            sum2+=nums[i];
        }
        return sum1-sum2;
    }
};