解题思路:
FJ在沙盘上写了这样一些字符串:
A1 = “A”
A2 = “ABA”
A3 = “ABACABA”
A4 = “ABACABADABACABA”
我们可以看出字符串的规律为:
A1 =“”+A +“”
A2 = A1 + B + A1
A3 = A2 + C + A2
A4 = A3 + D + A4
参考代码:
import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); //键盘录入输入的第几个数列 int n = sc.nextInt(); //定义一个字符数组存储26个大写字母 char[] arr = new char[26]; for (int i = 0; i < 26; i++) { //用for循环为字符数组赋值 arr[i] = (char) (i + 65); } //定义两个容器 StringBuilder sb = new StringBuilder(); StringBuilder newSb = new StringBuilder(); for (int i = 0; i < n; i++) { StringBuilder temp = new StringBuilder(); newSb.append(sb); newSb.append(arr[i]); newSb.append(sb); //sb记录前一个数列的值 sb = newSb; //将newSb清空 newSb = temp; } System.out.println(sb); } }
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