(HW)Permutation(Java)

 1 public class test
 2 {
 3     public static void main(String[] args)
 4     {
 5         Vector<Integer> v = new Vector<>();
 6         for(int i = 1; i <= 5; i++)
 7             v.add(i);
 8         Scanner input= new Scanner(System.in);
 9         int k = input.nextInt();
10         int[] solution = new int[k];
11         System.out.println(Permutation(v, solution, 0, k));
12         input.close();
13     }    
14     
15     public static int Permutation(Vector<Integer> v, int[] solution, int pos, int k)
16     {
17         if(pos == k)
18         {
19             System.out.println(Arrays.toString(solution) + " ");
20             return 1;
21         }
22         
23         int count = 0;
24         for(int i = 0; i < v.size(); i++)
25         {
26             int key = v.get(i);
27             solution[pos++] = key;
28             v.remove(i);
29             count += Permutation(v, solution, pos, k);
30             v.add(i, key);
31             pos--;
32         }
33         
34         return count;
35     }
36 }