leetcode -- Repeated DNA Sequences -- 简单但要注意

https://leetcode.com/problems/repeated-dna-sequences/

思路1

http://yucoding.blogspot.hk/2015/03/leetcode-question-repeated-dna-sequences.html

思路2

这里用了bit 运算,没太懂。
http://bookshadow.com/weblog/2015/02/06/leetcode-repeated-dna-sequences/

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