}if(start ==array.length){int[] temp =newint[array.length]; System.arraycopy(array,0,temp,0,array.length); list.add(temp); }for(inti = start; i < array.length; ++i){ swap(array,i,start); permutations(array,list,start+1); swap(array,i,start); } }//交换元素publicvoidswap(int...
Example: // Init an array with set 1, 2, and 3. int[] nums = {1,2,3}; Solution solution = new Solution(nums); // Shuffle the array [1,2,3] and return its result. Any permutation of [1,2,3] must equally likely to be returned. solution.shuffle(); // Resets the array bac...
https://leetcode.com/problems/shuffle-an-array/ public class Solution { int [] origNums; int [] shufNums; java.util.Random rd; public Solution(int[] nums) { origNums = nums; shufNums = origNums.clone(); rd = new java.util.Random(); } /** Resets the array to its original conf...
导语:shuffle算法(洗牌算法)就是将顺序打乱,一个典型的应该就是音乐播放器随机播放,下面是Java中 shuffle 算法的使用,一起来学习下吧: Fisher–Yates shuffle 基本思想(Knuth shuffle ): To shuffle an array a of n elements (indices 0..n-1): for i from n 1 downto 1 do j ← random integer with...
To shuffle an array a of n elements (indices 0..n-1): for i from n − 1 downto 1 do j← random integer with 0 ≤ j ≤ i exchange a[j] and a[i] JDK源代码如下: 复制代码 代码如下: /** * Moves every element of the List to a random new position in the list. ...
import java.util.*; public class ShuffleOfCollections { public static void main(String args[]) { // Instantiates an array list object List < Integer > arr_l = new ArrayList < Integer > (); Random ran = new Random(); // By using add() method is to add ...
Java扑克牌(洗牌Collections.shuffle) Java.util.Collections类下有一个静态的shuffle()方法,如下: 1)static void shuffle(List<?> list) 使用默认随机源对列表进行置换,所有置换发生的可能性都是大致相等的。 2)static void shuffle(List<?> list, Random rand) 使用指定的随机源对指定列表进行置换,所有置换发生...
AppendOnlyMap` 是类似于HashMap的数据接口。主要针对java中的map不能缓存null值的情况，实现了基于array...
--To shuffle an array aofnelements(indices0..n-1):fori from n−1downto1doj ← random integer such that0≤ j ≤ i exchange a[j]and a[i] 例子 迭代步骤演示 根据每次迭代次数可以用下面的表格,描述这个算法的执行过程 动画演示 下面这个动画就是整个数组 0-19 的随机排序过程 ...
This method runs in linear time. If the specified list does not implement theRandomAccessinterface and is large, this implementation dumps the specified list into an array before shuffling it, and dumps the shuffled array back into the list. This avoids the quadratic behavior that would result ...