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想了一个小时终于知了。。。。。

Posted by KOPOPT at 2005-09-10 15:59:22 on Problem 2605
大体就围绕一种走法。
1、---
   ***
  --*

2、--*
   **-
   ---

3、--*
   --*
   ---

4、---
   ---
   --*

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