operator-overload.cpp

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

/* Operator Overloading in C++ - Hacker Rank Solution START */

class Matrix 
{
    public:
        vector<vector<int>> a;

        Matrix() {}
        Matrix operator+(const Matrix &o) 
        {
            Matrix sum(*this);
            for (size_t i = 0; i < sum.a.size(); i++) 
            {
                for (size_t j = 0; j < sum.a[i].size(); j++) 
                {
                    sum.a[i][j] += o.a[i][j];
                }
            }
            return sum;
        }
};

/* Operator Overloading in C++ - Hacker Rank Solution END */

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;
}