问题 AB: Fractal
内存限制：128 MB
时间限制：1.000 S
评测方式：文本比较
命题人：
提交：49
解决：30
题目描述
A fractal is an object or quantity that displays self-similarity, in a somewhat technical sense, on all scales. The object need not exhibit exactly the same structure at all scales, but the same "type" of structures must appear on all scales.
A box fractal is defined as below :
Your task is to draw a box fractal of degree n.
A box fractal is defined as below :
-
A box fractal of degree 1 is simply
X
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A box fractal of degree 2 is
X X
X
X X
-
If using B(n - 1) to represent the box fractal of degree n - 1, then a box fractal of degree n is defined recursively as following
B(n - 1) B(n - 1) B(n - 1) B(n - 1) B(n - 1)
Your task is to draw a box fractal of degree n.
输入
The input consists of several test cases. Each line of the input contains a positive integer n which is no greater than 7. The last line of input is a negative integer −1 indicating the end of input.
输出
For each test case, output the box fractal using the 'X' notation. Please notice that 'X' is an uppercase letter. Print a line with only a single dash after each test case.
样例输入 复制
1
2
3
4
-1样例输出 复制
X
-
X X
X
X X
-
X X X X
X X
X X X X
X X
X
X X
X X X X
X X
X X X X
-
X X X X X X X X
X X X X
X X X X X X X X
X X X X
X X
X X X X
X X X X X X X X
X X X X
X X X X X X X X
X X X X
X X
X X X X
X X
X
X X
X X X X
X X
X X X X
X X X X X X X X
X X X X
X X X X X X X X
X X X X
X X
X X X X
X X X X X X X X
X X X X
X X X X X X X X
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