【Leetcode_easy】985. Sum of Even Numbers After Queries

class Solution {
public:
    vector<int> sumEvenAfterQueries(vector<int>& A, vector<vector<int>>& queries) {
        vector<int> res;
        int sum = 0;
        for(auto a:A) if(a%2==0) sum +=a;
        for(auto query:queries)
        {
            if(A[query[1]]%2==0 ) sum-=A[query[1]];
            A[query[1]] += query[0];
            if(A[query[1]]%2==0) sum +=A[query[1]];
            res.push_back(sum);
        }
        return res;
    }
};