> 为啥while(1)就AC，改成while（!s.empty())就WA呢？？
> #include <stdio.h>
> #include <iostream>
> #include <queue>
> using namespace std;
> 
> int n;
> long long bfs()
> {
> 	queue<long long> s;
> 	long long p;
> 	s.push(1);
> 	while(1)//改成while(!s.empty())就WA！！
> 	{
> 		p=s.front();
> 		s.pop();
> 		if(p%n==0)
> 			return p;
> 		s.push(p*10);
> 		s.push(p*10+1);
> 	}
> }
> int main()
> {
> 	while(scanf("%d",&n)&&n!=0)
> 	{
> 		long long m=bfs();
> 		printf("%lld\n",m);
> 	}
> 	return 0;
> }

same..
why??