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QuickSort.java
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52 lines (45 loc) · 1.54 KB
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package com;
/**
* @author <a href="mailto:daiju3@crnet.com.hk">daiju3</a>
* @version 1.0.0
* @description 快排
* @since 2018/7/12 10:45
*/
public class QuickSort {
public static void main(String[] args) {
int a[]={12,20,4,16,1,43,56,32,444,112,6666};
int start=0;
int end =a.length-1;
quickSort(a,start,end);
for(Integer i:a){
System.out.println(i);
}
}
public static void quickSort(int [] a,int low ,int high){
int start=low;
int end=high;
int key=a[low];
while (end>start){
//从后往前比较
while (end>start&&a[end]>=key)
end--;
if(a[end]<=key){
int temp=a[end];
a[end]=a[start];
a[start]=temp;
}
//从前往后比较
while (end>start&&a[start]<=key)//如果没有比关键值大的,比较下一个,直到有比关键值大的交换位置
start++;
if(a[start]>=key){
int temp=a[start];
a[start]=a[end];
a[end]=temp;
}
}
//此时第一次循环比较结束,关键值的位置已经确定了。左边的值都比关键值小,右边的值都比关键值大,但是两边的顺序还有可能是不一样的,进行下面的递归调用
//递归
if(start>low) quickSort(a,low,start-1);
if(end<high) quickSort(a,end+1,high);
}
}