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好像是数据有点问题，有的数据里面有不是小写字母的字符（我看到一个单引号）

Posted by hawk at 2004-07-31 16:47:27 on Problem 1732
In Reply To:这题的special judge没问题吗？ Posted by:sleepy at 2004-07-31 16:36:21 
> 我用BFS的程序死活都是WA。
> 改为一个DP就AC了。
> 
> 两种方法程序都很短，应该不会有错阿。
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