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这个题没有想象中的那么难吧?几个易出错的地方,我总结如下:

Posted by purplefly at 2006-08-07 12:03:57 on Problem 2712
1、以单个字符的为一行的消息,只有a或A或I是OK
2、每一行消息第一个字符和最后一个字符判断比较特殊,因为他们的adjacent字符只有一个
   An isolated character is one whose only adjacent characters (if any) are spaces.
   if any表明adjacent字符数量可以是1或2
3、两个标点符号连在一起时,当有且只有一个标点是"时,OK,注意:两个标点都是"也是suspicious 

大概就这些吧,还有什么易错的地方,欢迎补充

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