题解 | 凯撒加密

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        in.nextLine();
        String s = in.nextLine();

        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);

            char shifted = (char) ((c - 'a' + n) % 26 + 'a');

            sb.append(shifted);
        }

        System.out.print(sb.toString());
    }
}