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求福州现场赛自动机那题的trick把模式串建成自动机，然后分别对待匹配串正序、逆序匹配一次，求有多少模式串被匹配到，这思路有错？WA到死。。问fdu的大牛，说建两个自动机，然后把模式串反过来就过了，超级无语。。求真相 Followed by:
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