首页 > 代码库 > leetcode mock Shuffle an Array
leetcode mock Shuffle an Array
1. shuffle算法:
http://www.cnblogs.com/huaping-audio/archive/2008/09/09/1287985.html
注意:我们一般用的是第二种swap的方法;但是第一种直接选择,然后把最末尾一位填上的方法,也是很好的。只是会需要两倍的空间。
2. Random nextInt(bound)参数表示 0-inclusive,bound-exclusive: [0, bound)
package com.company;import java.util.LinkedList;import java.util.List;import java.util.Random;public class Main { private int[] orig; public Main(int[] nums) { orig = nums; } /** Resets the array to its original configuration and return it. */ public int[] reset() { return orig; } /** Returns a random shuffling of the array. */ public int[] shuffle() { int[] ret = orig.clone(); Random rand = new Random(); for (int i=0; i<ret.length; i++) { // int value between 0 (inclusive) and the specified value (exclusive) int r = rand.nextInt(ret.length-i); if (r != ret.length-i-1) { int k = ret[r]; ret[r] = ret[ret.length - i - 1]; ret[ret.length - i - 1] = k; } } return ret; } public static void main(String[] args) { // write your code here System.out.println("Hello"); int []nums = {1,2,3}; Main obj = new Main(nums); int[] param_1 = obj.reset(); int[] param_2 = obj.shuffle(); System.out.printf("param_1: %d, %d, %d\n", param_1[0], param_1[1], param_1[2]); System.out.printf("param_2: %d, %d, %d\n", param_2[0], param_2[1], param_2[2]); }}
leetcode mock Shuffle an Array
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。