Solution: Dutch National Flag Problem

class DutchFlag {
 //sorting in ascending order using selection sort
 public static int[] selectionSort(int[] lst) {
  int size = lst.length;
  int index = 0;
  for (int i = 0; i < size; i++) {
   //finding the minimum value's index
   index = find_min(lst, i, size);
   //swapping it with current value
   int temp = lst[i];
   lst[i] = lst[index];
   lst[index] = temp;
  }
  return lst;
 }
 //function to find the index of the minimum value  
 public static int find_min(int[] lst, int start, int end) {
  int min = lst[start];
  int index = start;
  for (int i = start; i < end; i++) {
   if (lst[i] < min) {
    min = lst[i];
    index = i;
   }
  }
  return index;
 }
 //driver function
 public static void main(String args[]) {
  int[] arr = {
   2,
   0,
   0,
   1,
   2,
   1
  };
  System.out.println(Arrays.toString(selectionSort(arr)));
 }
}