Java实现 洛谷 P1914 小书童——密码

import java.util.Scanner;

public class Main {

	private static Scanner cin;

	public static void main(String args[]) throws Exception {

		cin = new Scanner(System.in);

		int n = cin.nextInt();

		n = n % (122-97+1);

		String password = cin.next();

		char[] array = password.toCharArray();

		char[] ret = new char[array.length];

		int length = 0;

		for(int i=0; i<array.length;i++) {

			if(array[i] >= 97 && array[i]<=122) {

				if(array[i]+n >122) {

					ret[length] = (char)(array[i]+n-122+97-1);

				}else {

					ret[length] = (char)(array[i]+n);

				}

				length++;

			}

		}

		for(int i=0;i<length;i++) {

			System.out.print(ret[i]);

		}

		System.out.println();

	}

}