无矩形网格 - Problème

#12657. 无矩形网格

Statistiques

AI Translation — This statement was translated using AI and may contain inaccuracies. Please refer to the original statement if in doubt.

构造一个 $N \times N$ 的网格，满足以下条件：

$2 \le N \le 150$
每个单元格填充为 'O' 或 '.'。
至少有 1700 个单元格填充为 'O'。
对于任意四个整数 $i, j, k, l$，满足 $1 \le i < j \le N$ 且 $1 \le k < l \le N$，四个单元格 $(i, k), (i, l), (j, k), (j, l)$ 中至少有一个填充为 '.'。

输入格式

没有输入。

输出格式

第一行包含一个整数 $N$。接下来的 $N$ 行，每行包含 $N$ 个字符（'O' 或 '.'），这些行描述了该网格。

样例

输入格式 1

(无)

输出格式 1

5
.....
.....
..OOO
...O.
..O..

说明

该样例的输出满足除第三个条件（网格中 'O' 的数量）以外的所有条件。

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