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();
        String s = in.next();
        char c[] = s.toCharArray();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < s.length(); i++) {
            // 使用模运算确保循环移位
            char newChar = (char)('a' + (c[i] - 'a' + n) % 26);
            sb.append(newChar);
        }
        System.out.print(sb.toString());
    }
}