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这个做法对的~~

Posted by conanhjj at 2009-01-15 13:44:03 on Problem 3356
In Reply To:求出两个串的公共子序列长度lcs，然后用 最长串的长度减去lcs，即是结果。 Posted by:ecjtuzxg at 2008-06-28 08:53:19 
不相信的可以用反证法证明下，很容易的。

p.s. AC了
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