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给你几个例子理解下

Posted by 20053565 at 2010-06-13 00:35:29 on Problem 3291
In Reply To:有路过的请指点一下啊～ Posted by:derness at 2007-07-29 19:54:07 
a -> ab -> b
a -> aa -> aaaa -> aaaaaaaa -> aaaaaaaaaaa
xx -> xxaa -> xxaaaa -> aaaaaaa
ab -> abcd -> abcdefgh
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