用Java解决贪心算法——删数问题

import java.util.Scanner;


public class shanshuwenti2 {
	 public static int Delete(int a,int k)
	    {
	        StringBuffer sb=new StringBuffer(a+"");
	        int i=0,j=0;
	        for(i=0;i<k;i++)
	        {
	            for(j=0;j<sb.length()-1&&sb.charAt(j)<=sb.charAt(j+1);j++)
	            {
	            }
	            sb.delete(j,j+1);
	        }
	        return sb.length()==0?0:Integer.parseInt(sb.toString());
	    }
	 
	    public static void main(String[] args)
	    {
	            Scanner in=new Scanner(System.in);
	            int a=in.nextInt();
	            int b=in.nextInt();
	            if(a<=0||b<=0)
	                System.exit(0);
	            System.out.println(Delete(a,b));
	    }


}