operator-overloading.cpp

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

class Matrix{
public: 
    vector<vector<int> > a;
    Matrix operator +(Matrix b){
        Matrix result;
        for (int i = 0; i < a.size(); i++){
            vector<int> v;
            result.a.push_back(v);
            for (int j = 0; j < a[i].size(); j++){
                result.a[i].push_back(a[i][j] + b.a[i][j]);
            }
        }
        return result;
    }
};

int main () {
   int cases,k;
   cin >> cases;
   for(k=0;k<cases;k++) {
      Matrix x;
      Matrix y;
      Matrix result;
      int n,m,i,j;
      cin >> n >> m;
      for(i=0;i<n;i++) {
         vector<int> b;
         int num;
         for(j=0;j<m;j++) {
            cin >> num;
            b.push_back(num);
         }
         x.a.push_back(b);
      }
      for(i=0;i<n;i++) {
         vector<int> b;
         int num;
         for(j=0;j<m;j++) {
            cin >> num;
            b.push_back(num);
         }
         y.a.push_back(b);
      }
      result = x+y;
      for(i=0;i<n;i++) {
         for(j=0;j<m;j++) {
            cout << result.a[i][j] << " ";
         }
         cout << endl;
      }
   }  
   return 0;
}