/**
* @example
* <pre name="test">
* int[] testi = {4, 2, 4, 0};
* jarjesta(testi);
* testi[0] === 0;
* testi[1] === 2;
* testi[2] === 4;
* testi[3] === 4;
* </pre>
*/
public static void jarjesta(int[] taulukko) {
   int[] apu = new int[taulukko.length+1];
   for (int i = 0; i < taulukko.length; i++) 
      apu[taulukko[i]]++;
   int j = 0;
   for (int i = 0; i < apu.length; i++)
      while (apu[i]-- > 0) 
         taulukko[j++] = i;
}