HDU 1022 ( Train Problem I )

太囧了，刚开始我居然把

while(!s.empty()) s.pop();
while(!q.empty()) q.pop();

写成了

if(!s.empty()) s.pop();
if(!q.empty()) q.pop();

害我WA了十多次，浪费了不少时间。幸亏在论坛上发帖了，多谢lidajun0717这位兄弟发现了，再次感谢

Problem : 1022 ( Train Problem I )     Judge Status : Accepted
RunId : 5628664    Language : C++    Author : ssun
Code Render Status : Rendered By HDOJ C++ Code Render Version 0.01 Beta

#include<cstdio>
#include<stack>
#include<queue>
#include<string>
#include<iostream>
using namespace std;

int main()
{
    stack<char> s;
    queue<string> q;
    char s1[110],s2[110];
    int n;
    while(scanf("%d",&n)!= EOF)
    {
        //getchar();
        while(!s.empty()) s.pop();
        while(!q.empty()) q.pop();
        scanf("%s%s",s1,s2);
        //cout<<strlen(s1)<<endl;
        //printf("%s\n%s",s1,s2);
        int k=0;
        int i=0;
        while(i<=n)    
        { 
          if(!s.empty()&&s.top()==s2[k])
          {                      
            while(!s.empty()&&s.top()==s2[k])     
            {
               s.pop();
               q.push("out");
               k++;
            } 
            if(k>=n) break;
            //i--;
          }
          else if(i==n) break; 
          else
          {
            s.push(s1[i]);               
            q.push("in");
            i++;
          }  
        }     
       if(k>=n) 
       {   puts("Yes.");  
         while(!q.empty())
          {
             cout<<q.front()<<endl;
             q.pop();              
          }         
       }
       else puts("No.");
       puts("FINISH");
    }  
   return 0;
}