> #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;	
> 		}
> 		
> }

• 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