#include<iostream>
#include<algorithm>
using namespace std;
int sub(int &a,int &m){
		
		int num[4];
		num[0]=a%10;
		num[1]=(a%100)/10;
		num[2]=(a%1000)/100;
		num[3]=a/1000;
		if((num[0]==num[1])&&(num[1]==num[2])&&(num[2]==num[3]))
			return -1;
		sort(num,num+4);
		int b=num[0]*1000+num[1]*100+num[2]*10+num[3];
		a=num[3]*1000+num[2]*100+num[1]*10+num[0];
		
		if(num[0]==0&&num[2]==num[1]&&num[2]==num[3]){
			a=a/10;
			
		}
		int temp=a-b;
		cout<<a<<"-"<<b<<"="<<temp<<endl;
		 a=temp;
		 return 0;
		
 
}
	
int main(){
		
		int a,b;
		
		cin>>a;
		while(a!=-1){
			if(a>9999){
				cout<<"No!!"<<endl;
				cin>>a;
				continue;
			}
			int n=1;
			cout<<"N="<<a<<":"<<endl;
			for(int &m=n;;m++){
				b=sub(a,m);
				if(b==-1){
					cout<<"No!!"<<endl;
					break;
				}
				if(a==0||a==6174){
				cout<<"ok!! "<<m<<" times"<<endl;
				break;
				}
			}
		cin>>a;	
		}
		
}

• 注意No和Ok的大小写！我把No写成NO就WA了 (1053) seol 2004-12-24 18:48:38
  • 我晕，题目描述中“no"是全部大写，与sample output中不同！！！hawk改改吧…… (247) xiedi 2005-04-26 23:15:09
    • done (255) hawk 2005-04-26 23:24:42