Formiranje niza (razlika u koloni)

/* Formiranje niza tako sto je b[j] jednak razlici maximalnog i minimalnog clana kolone */
#include <iostream>
using namespace std;
main()
{
      int a[50][50], b[50], m, n, i, j, max, min;
      cin >> m >> n;
      for (i=0; i<m; i++)
      for (j=0; j<n; j++)
      cin >> a[i][j];
      for (j=0; j<n; j++)
      {
          max = a[0][j];
          min = a[0][j];
          for (i=1; i<m; i++)
          {
              if (a[i][j] > max)
              max = a[i][j];
              if (a[i][j] < min)
              min = a[i][j];
          }
          b[j] = max - min;
      }

      cout << endl;
     /* Stampanje matrice */
     /* for (i=0; i<m; i++)
      {
          for (j=0; j<n; j++)
          cout << a[i][j] << " ";
          cout << endl;
      }
      */

      for (j=0; j<n; j++)
      cout << b[j] << " ";
      system ("PAUSE");
}