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);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            int a = Integer.valueOf(in.nextLine());
            String b = in.nextLine();
            String z = "abcdefghijklmnopqrstuvwxyz";
            for(int i = 0;i<b.length() ;i++){
               int dex = z.indexOf(b.charAt(i));
               int newIndex = dex + a;
               if(newIndex > z.length()-1){
                  newIndex = newIndex % z.length();
               }
               System.out.print(String.valueOf(z.charAt(newIndex)));
            }
            
        }
    }
}