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本题将单词表建成一个树可以很轻松过掉。

Posted by tdzl2003 at 2005-07-29 14:40:07 on Problem 2503 
我的程序，占内存15128K，时间453MS，比较宽裕。

二分法危险了点，哈西我一个朋友做了半天也没过掉。
所以……还是建树方便。
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