Histogram (S)

// dragutinmarjanovic
#include <iostream>
using namespace std;
main()
{
      int n, a[1000], s;

      cin >> n;

      for (int i=0; i<n; i++)
      cin >> a[i];

      for (int i=0; i<n; i++)
      {
         s = 1;
          for (int j=i+1; j<n; j++)
              if (a[i] == a[j])
              {
                       s = s + 1;
                       a[j] = -1;
              }
          if (a[i]!=-1)
             cout << a[i] << " " << s << endl;
      }

      system ("PAUSE");
}