BASIC-22FJ字符串

资源限制

时间限制：1.0s   内存限制：512.0MB

问题描述

　　FJ在沙盘上写了这样一些字符串：
　　A1 = “A”
　　A2 = “ABA”
　　A3 = “ABACABA”
　　A4 = “ABACABADABACABA”
　　… …
　　你能找出其中的规律并写所有的数列AN吗？

输入格式

　　仅有一个数：N ≤ 26。

输出格式

　　请输出相应的字符串AN，以一个换行符结束。输出中不得含有多余的空格或换行、回车符。

样例输入

3

样例输出

ABACABA

思想：递归蚊子腿，注意中间的分界就好

import java.util.*;
public class Main {
	
	public static String anwser(String [] a,int n,String aString,int judge) {
		
		if(judge>n-1)
		return aString;
		
		else
			{
			judge++;
			aString=anwser(a, n, aString, judge)+a[n+2-judge]+anwser(a, n, aString, judge);
			
			return aString;
			}
		
	}
	
	
public static void main(String[] args) {
	Scanner in =new Scanner(System.in);
	String[] a= {"0","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};
	String aString="A";
	int n=in.nextInt();
	int judge=1;
	System.out.println(anwser(a, n, aString, judge));
}
}

可能有点小问题，后面会再看看，感觉有点别扭啊。