lixwjava的专栏

package permutation;import java.util.Scanner;public class DeclinePermutation { public int factorial(int n) { int sum = 1; while (n > 1) { sum *= (n--); } return sum; } // get initi

package permutation;import java.util.Scanner;class Digit { int value; String direction; public Digit(){};}public class NeighbourExchangePermutation { public int factorial(int n) { int su

package permutation;import java.util.Scanner;public class Test { public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("---------------start---------