C语言解答

#include <stdio.h>
int arrange(int *arr){
    int i,j,t;
    for(i=0;i<4;i++){
        for(j=0;j<3;j++){
            if(arr[j]<arr[j+1]){
                t=arr[j];
                arr[j] = arr[j+1];
                arr[j+1] = t;
            }
        }
    }
    return 1;
}
int sepNum(int *d, int num){
    d[0]=num%10;
    d[1]=num/10%10;
    d[2]=num/100%10;
    d[3]=num/1000;
    return 1;
}
int main(){
    int i=0,num,newnum,n;
    int a,d[4];
    scanf("%d",&n);
    while(n--){
        scanf("%d",&num);
        sepNum(d,num);
        while(newnum!=6174){
            arrange(d);
            newnum= d[0]*1000+d[1]*100+d[2]*10+d[3] - d[3]*1000-d[2]*100-d[1]*10-d[0];
            sepNum(d,newnum);
            i++;
        }
        printf("%d\n",i+1);
        i=0;
        newnum=0;
    }
    return 1;
}

Java解答

import java.util.Scanner;
public class Main
{
	public static void main(String[] args)
	{
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		while(n-->0)
		{
			String str=sc.next();
			String str1=getAnswer(str);
			int count=1;
			while(!str1.equals(str))
			{
				count++;
				str=str1;
				str1=getAnswer(str1);
			}
			System.out.println(count);
		}
	}
	public static String getAnswer(String str)
	{
		char[] ch=str.toCharArray();
		for(int i=0;i<ch.length;i++)
		{
			ch[i]=str.charAt(i);
		}
		maxbubbleSort(ch);
		String a=String.valueOf(ch);
		minbubbleSort(ch);
		String b=String.valueOf(ch);
		int c=Integer.parseInt(a)-Integer.parseInt(b);
		return String.valueOf(c);
	}
	public static void maxbubbleSort(char ch[])
	{
		for(int i=0;i<ch.length;i++)
		{
			for(int j=0;j<ch.length-i-1;j++)
			{
				if(ch[j]<ch[j+1])
				{
					char temp=ch[j];
					ch[j]=ch[j+1];
					ch[j+1]=temp;
				}
			}
		}
	}
	public static void minbubbleSort(char ch[])
	{
		for(int i=0;i<ch.length;i++)
		{
			for(int j=0;j<ch.length-i-1;j++)
			{
				if(ch[j]>ch[j+1])
				{
					char temp=ch[j];
					ch[j]=ch[j+1];
					ch[j+1]=temp;
				}
			}
		}
	}
}