给定数组a[1,2,3],用a里面的元素来生成一个长度为5的数组,打印出其排列组合 ruby代码: def all_possible_arr arr, length = 5 ret = [] length.times do if ret.empty? ret = arr.map {|i| [i]} else new_ret = [] ret.each do |r| arr.each do |e| new_ret << r.clone.unshift(e) end end ret = new_r…
代码: —————————————————————————————— <script type="text/javascript"> //倒排序子元素的函数 function deleteChilds(){ //获取父DOM var ul = document.getElementsByTagName('UL')[0]; if(ul.…
package com.shb.web; import java.util.Arrays;import java.util.List; import com.sun.xml.internal.ws.util.StringUtils; public class Test { public static void main(String[] args) { int [] num = {1,2,3}; List<int[]> list = Arrays.asList…