凯撒密码题解

#include<bits/stdc++.h>
#include <string>
using namespace std;
int main(){
string a,b,s;
cin>>a>>b>>s;
int c=a[0]-b[0];
for(int i=0;i<s.size();i++){
s[i]+=c;
if(s[i]>'Z')s[i]-=26;
if(s[i]<'A')s[i]+=26;
}
cout<<s;
}