Concatenare matrice

#include <iostream>
using namespace std;
int main()
{
    int i, j, m, n, a[100][100];
    cout << "Introduceti numarul de linii: ";
    cin >> m;
    cout << "Introduceti numarul de coloane: ";
    cin >> n;
    for(i = 1; i <= m; i++)
        for(j = 1; j <= n; j++)
        {
            if(i > j)
                a[i][j] = i * 10 + j;
            else a[i][j] = j * 10 + i;
        }
    for(i = 1; i <= m; i++) {
        for(j = 1; j <= n; j++)
            cout << a[i][j] << " ";
        cout << endl;
    }
    cout << endl;
    return 0;
}