题解 | 凯撒加密

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