Assignment problem 1

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <vector>

using namespace std;

bool cmp(pair <int, pair <int, int> > a, pair <int, pair <int, int> > b){
     return a.second.second < b.second.second;
}
int main(){
     int n, m;

     cout << "Please enter the number of rows and columns of the matrix:\n";
     cin >> n >> m;

     int A[n + 1][m + 1], T[m + 1][n + 1];

     cout << "Please enter the matrix:\n";
     for(int i = 1;i <= n;i ++){
          for(int j = 1;j <= n;j ++){
               cin >> A[i][j];
               T[j][i] = A[i][j];
          }
     }

     vector<pair <int, pair <int, int> > > ansA, ansT;
     for(int i = 1;i <= n;i ++){
          for(int j = 1;j <= m;j ++){
               if(A[i][j])
                 ansA.push_back (make_pair(i, make_pair(j, A[i][j])));
               if(T[i][j])
                 ansT.push_back (make_pair(i, make_pair(j, T[i][j])));
          }
     }

	 cout << "The triple list of matrix is:\n";
     for(auto x : ansA){
          cout << x.first << ' ' << x.second.first << ' ' << x.second.second << endl;
     }
     cout << "The triple list of transpose of matrix is:\n";

     for(auto x : ansT){
          cout << x.first << ' ' << x.second.first << ' ' << x.second.second << endl;
     }

     sort(ansA.begin(), ansA.end(), &cmp);
     cout << "The sorted triple list of matrix is:\n";
     for(auto x : ansA){
          cout << x.first << ' ' << x.second.first << ' ' << x.second.second << endl;
     }
}