Java-递归算法：N选M组合，过滤重复的

package com.xxx.xxxx.template.service;

import java.util.Scanner;

/**
 * 测试类TiGuiTest
 */
public class TiGuiTest {
	static int row;
	public static void main(String args[]){
	System.out.print("Please input n:");//这里n取8
	Scanner scan1=new Scanner(System.in);
	int n=scan1.nextInt();
	  
	System.out.print("Please input r:");//这里r取5
	Scanner scan2=new Scanner(System.in);
	int r=scan2.nextInt();
	int[] list=new int[n];
	for(int i=0;i<n;i++){
	list[i]=n-i;
	}
	combination(list,r,0,n);
	  }
	/**
	* 递归函数
	*/
	  static void combination(int[] list,int r,int low,int n){
	  
	  if(low<r){
	  for(int j=low;j<n;j++){
	  if((low>0&&list[j]<list[low-1])||low==0){
	  int temp=list[low];
	  list[low]=list[j];
	  list[j]=temp;
	  combination(list,r,low+1,n);
	  temp=list[low];
	  list[low]=list[j];
	  list[j]=temp;
	  }
	  }
	  }
	  if(low==r){
	  for(int i=0;i<r;i++){
	  System.out.print(list[i]+" ");
	  }
	  System.out.println(" ");
	  }	
	  }
}