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一定要注意这两种情况

Posted by 00648057 at 2011-03-25 20:31:46 on Problem 1189
1.最上面一个钉子是空的
     .
   *  *
  *  *  *


2.最后一行没有钉子

球有可能落在两个空格中间的隔板上

     ×
   * *
  * * *
 . * . *
_|_|_|_|_

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