算法溫習——手撕快速排序

1、快速排序介紹

坐在馬桶上看算法：快速排序

2、Java實現（個人實現。。）

import org.junit.Test;

public class QuickSortTest {

    public void quickSort(int[] array, int left, int right){
        if (left>=right){
            return;
        }
        int i = left, j = right;
        int temp = array[left];
        while (i<j){
            while (array[j] >= temp) {
                j--;
            }
            while (array[i] <= temp){
                i++;
            }
            if (i < j){
                int t = array[i];
                array[i] = array[j];
                array[j] = t;
            }
        }
        array[left] =array[j];
        array[j] = temp;

        quickSort(array,left,j-1);
        quickSort(array,j+1,right);
    }

    @Test
    public void testQuickSort(){
        int[] array = {6,1,2,7,9,3,4,5,10,8};
        for (int i : array){
            System.out.print(i+" ");
        }
        System.out.println();
        quickSort(array,0,array.length-1);

        for (int i : array){
            System.out.print(i+" ");
        }
    }
}

運行結果：