题解 | #跳台阶扩展问题#

import java.io.*; public class Main{ public static void main(String[] args)throws IOException{ BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); String str = null; while((str = in.readLine()) != null){ int n = Integer.parseInt(str); System.out.println((int)Math.pow(2,n-1)); } } }