Java实现 蓝桥杯VIP 算法训练 快速排序

import java.util.Scanner;

public class 快速排序 {
		public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		int a=sc.nextInt();
		int[] ar=new int[a];
		for(int i=0;i<a;i++){
			ar[i]=sc.nextInt();
		}
		System.out.println("y"+(ar.length-1));
		Fast(ar,0,ar.length-1);
		for(int l=0;l<ar.length;l++){
		System.out.print(ar[l]);}
	}
	static void Fast(int[] ar,int x,int y){
		if(x>=y) {
			return;
			}
		int n=y;
		int j=x;
		int i=x;
		for(int m=x;m<y;m++){

			if(ar[m]<=ar[n]){
				int b=ar[i];
				ar[i]=ar[m];
				ar[m]=b;
				i++;
				j++;
			}
			else if(ar[m]>ar[n]){
				int b=ar[j];
				ar[j]=ar[m];
				ar[m]=b;
				j++;
			}
		}
		System.out.println("***i"+i);
		int b=ar[i];
		ar[i]=ar[n];
		ar[n]=b;
		System.out.println("*******x"+x+"***y"+y+"***i"+i);
		Fast(ar,x,i-1);
		Fast(ar,i+1,y);
}

}