题解

#include<bits/stdc++.h>
using namespace std;
int main(){
	int m ,n ,l = 0 ;
	double sum = 0;
    cin >> m >> n;
    int lst[m + 1][n + 1] = {};
    for (int i = 1 ; i <= 2 ; i++){  //两次输入，循环两次
        for (int j = 1 ; j <= m ; j++){
            for (int k = 1 ; k <= n ; k++){
                cin >> l;
                lst[j][k] += l;
            }
        }
    }
    for (int i = 1 ; i <= m ; i++){  //输出矩阵
        for (int j = 1 ; j <= n ; j++){
            cout << lst[i][j] << " ";
        }
        cout << "\n";
    }
    return 0;
}