// PermutationExample.java SJ

import java.util.Iterator;
import java.lang.Iterable;


public class PermutationExample {

    public static void main(String[] args) {

        int N = 4, K = 6;

        PermutationExample l = new PermutationExample();

        if (args.length > 0)
            N = Integer.valueOf(args[0]);

        if (args.length > 1)
            K = Integer.valueOf(args[1]);

        Permutation P = new Permutation(N);
        // Permutation P = new Permutation(N, 42);   // random seed

        System.out.println("All permutations:");
        for (int[] perm : P) {
            if (N <= 6) {   // not for large N
                for (int i = 0; i < N; i++)
                    System.out.print(perm[i] + " ");
                System.out.println();
            }
        }

        System.out.println("Some random permutations:");
        for (int s = 0; s < K; s++) {
            int[] perm = P.randomPermutation(N);
            for (int i = 0; i < N; i++)
                System.out.print(perm[i] + " ");
            System.out.println();
        }

        System.out.println("Random permutations of different size:");
        for (int s = 1; s <= K; s++) {
            int[] perm = P.randomPermutation(s);
            for (int i = 0; i < s; i++)
                System.out.print(perm[i] + " ");
            System.out.println();
        }

    } // main()
}