快速排序

Posted 2020-06-17

public class QuickSort {
    public static int getMidIndex(int[] list, int low, int high) {
        int temp = list[low];
        while(low < high) {
            while(low<high && list[high] >= temp) {
                high --;
            }
            list[low] = list[high];
            while(low<high && list[low] <= temp) {
                low ++;
            }
            list[high] = list[low];
        }
        list[low] = temp;
        return low;
    }
    
    public static void quickSort(int[] list, int low, int high) {
        //递归一定要注意递归结束的条件，否则就是死循环
        if(low < high) {
            int middle = getMidIndex(list, low, high);
            quickSort(list, low, middle-1);
            quickSort(list, middle+1, high);
        }
        
    }
    
    public static void main(String[] args) {
        int[] list = { 8, 23,6, 6,7,7,3,4,0,9, 17};
        quickSort(list, 0, list.length-1);
        for(int i = 0 ; i < list.length; i++) {
            System.out.print(list[i] + " ");
        }
        
        
    }

}