每日一题洛谷P1914 小书童——凯撒密码c++

#include<iostream>
#include<cstring>
using namespace std;
int main()
{
    int n;
    string s;
    cin >> n >> s;
    for (int i = 0; i < s.size(); i++) {
        for (int j = 0; j < n; j++) {
            s[i]++;
            if (s[i] > 'z')s[i] = 'a';
        }
    }
    cout << s << endl;
    return 0;
}