sicily 1007 To and Fro

题意：字符串的操作处理

 // Problem#: 8768
 // Submission#: 2606406
 // The source code is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
 // URI: http://creativecommons.org/licenses/by-nc-sa/3.0/
 // All Copyright reserved by Informatic Lab of Sun Yat-sen University
 #include<iostream>
 #include<string>
 #include<vector>
 #include <algorithm>
 #include<cstdlib>
 using namespace std;

 vector<string> str;
 int main(){
     int T;
     string input;

     while(cin>>T && T != ){
         cin>>input;
         int row = input.size()/T;
         str.resize(row);
         for(int i=;i<row;i++){
             string temp;
             temp =input.substr(+i*T,T);
             if(i%==){
                 reverse(temp.begin(),temp.end());
             }
             str[i]=temp;
         }
         for(int i=;i<T;i++){
             for(int j=;j<row;j++)
                 cout<<str[j][i];
         }
         cout<<endl;
     }
     return ;
 }