题解 | #多组_二维数组_T组形式#

#include <iostream>
#include <vector>
using namespace std;

int main() {
    int T;
    cin >> T;
    while (T--) { // 注意 while 处理多个 case
        long long int sum=0;
        int n, m;
        cin >> n >> m;
        while (n--) {
            vector<int>subArr;
            long long int subSum = 0;
            for (int i = 1; i <= m; i++) {
                int a;
                cin >> a;
                subArr.push_back(a);
            }
            for(auto subNode:subArr){
                subSum+=subNode;
            }
            sum+=subSum;
        }
        printf("%lld\n", sum);
    }
}
// 64 位输出请用 printf("%lld")