perms

package com.company.Recursion.problems;

import java.util.Scanner;

public class Perms_NB {
    static int count;
    static int inputNum;
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        inputNum=input.nextInt();
        int[] set=new int[inputNum];
        int[] result=new int[inputNum];
        boolean[] used=new boolean[inputNum];
        fillSet(set);
        genPermutations(0,set,result,used);

    }

    private static void genPermutations(int index, int[] set,int[] result,boolean[]used){

        if(index==result.length){
                printPerm(result);
        }
        else{

            for (int i = 0; i < result.length; i++) {
                if (!used[i]) {
                    used[i]=true;
                    result[index] = set[i];
                    genPermutations(index + 1, set, result,used);
                    used[i]=false;
                }
            }
        }
    }

    private static void printPerm(int[] set) {
        //
        for (int i = 0; i < set.length - 1; i++) {
            System.out.print(set[i] + " ");
        }
        System.out.println(set[set.length - 1]);
    }
    private static int[] fillSet(int[] set) {
        for (int index = 0; index <set.length ; index++) {
            set[index]=index+1;
        }
        return set;
    }
}