P1079 [NOIP2012 提高组] Vigenère 密码 [模拟]

Posted 2021-05-14 幽殇默

https://www.luogu.com.cn/problem/P1079

#include<cstdio>
#include<iostream>
#include<string>
#include<cstring>
using namespace std;
int main(void)
{
    string s,key; cin>>key>>s;
    int k=0;
    for(int i=0;i<s.size();i++)
    {
        int temp=toupper(s[i])-'A'-(toupper(key[k++])-'A');
        temp=(temp+26)%26;
        if(k==key.size()) k=0;
        if(s[i]>='a')
        cout<<char('a'+temp);
        else cout<<char('A'+temp);
    }
    return 0;
}