题解 | #A+B for Matrices#

#include <iostream>
using namespace std;
int main() {
    int m, n;
    while (cin >> m) {
        if(m==0)break;
        cin>>n;
        //输入两个矩阵
        int a[m][n], b[m][n],res[m][n];
        for (int i = 0; i < m; i++)
            for (int j = 0; j < n; j++)
                cin >> a[i][j];
        for (int i = 0; i < m; i++)
            for (int j = 0; j < n; j++)
                cin >> b[i][j];
        //矩阵相加
        for(int i =0;i<m;i++)
            for(int j =0;j<n;j++)
                res[i][j] = a[i][j]+b[i][j];
        int zeroRow = 0,zeroColumn = 0;
        for(int i =0;i<m;i++){
            bool isAllZero = 1;
            for(int j =0;j<n;j++){
                if(res[i][j] != 0){
                    isAllZero = 0;
                    break;
                }    
            }
            if(isAllZero)zeroRow++;
        }
        for(int j =0;j<n;j++){
            bool isAllZero = 1;
            for(int i =0;i<m;i++){
                if(res[i][j] != 0){
                    isAllZero = 0;
                    break;
                }                
            }
            if(isAllZero)zeroColumn++;
        }
        cout<<zeroRow+zeroColumn<<endl;
    }
}
// 64 位输出请用 printf("%lld")

写的有点繁了