杭电OJ--1048-C++实现

#include <iostream>
#include<vector>
#include<string>
#include<cctype>
#include<algorithm>
#include<stdio.h>
using namespace std;
int main()
{
    string alph="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    vector<string> str(3);
    while(cin>>str[0] && str[0]!="ENDOFINPUT")
    {
        getchar();
        getline(cin,str[1]);
        string::size_type n=str[1].size();
        for(decltype(n) i=0;i<n;i++)
        {
         if(str[1][i]<='Z' && str[1][i]>='A')
         {
             if((str[1][i]-'A'-5)>=0)
             str[1][i]=alph[str[1][i]-'A'-5];
             else
                str[1][i]=alph[str[1][i]-'A'+21];
         }
        }
        cin>>str[2];
        cout<<str[1]<<endl;
    }
    return 0;
}