yunfuyiren的专栏

import java.util.Random; public class hello{ public static int []aa; public static void main(String args[]) { int []b=new int[11]; // int []b={8,4,7,8,6,5,10,8,6,10,8}; int l=0,k=5; Random

题目如下：Given a collection of numbers, return all possible permutations. For example, [1,2,3] have the following permutations: [1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1,2], and [3,2,1]. 分析：如果只