CodeVs 1197 && noip 2012 Day1 Vigenère密码

#include<cstdio>
#include<string>
#include<cstring>
#include<iostream>
using namespace std;
char word[28];
void init()
{
char s='a';
int tot=0;
for (int i=0; i<=25; i++)
{
word[++tot]=int(s+i);
}
}
int main()
{
init();
string ms;
string mw;
cin>>ms>>mw;
int tot=0;
for (int i=0; i<ms.size(); i++)
{
if (ms[i]>='A' && ms[i]<='Z') ms[i]-=('A'-'a');
}
for (int i=0; i<mw.size(); i++)
{
if (tot>ms.size()-1) tot=0;
char s=mw[i];
if (mw[i]>='A' && mw[i]<='Z'){

s-='A'-'a';

if (s<ms[tot]) cout<<char('z'-(ms[tot]-s)+'A'-'a'+1);
else cout<<char(s-ms[tot]+'a'+'A'-'a');
}
else
if (s<ms[tot]) cout<<char('z'-(ms[tot]-s)+1);
else cout<<char(s-ms[tot]+'a');
tot++;
}
cout<<endl;
return 0;
}