187. Repeated DNA Sequences(建立词典，遍历一遍 o(n))

All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: "ACGAATTCCG". When studying DNA, it is sometimes useful to identify repeated sequences within the DNA.

Write a function to find all the 10-letter-long sequences (substrings) that occur more than once in a DNA molecule.

Example:

Input: s = "AAAAACCCCCAAAAACCCCCCAAAAAGGGTTT"

Output: ["AAAAACCCCC", "CCCCCAAAAA"]

 class Solution:

     def findRepeatedDnaSequences(self, s):

         """

         :type s: str

         :rtype: List[str]

         """

         d ={}

         for i in range(len(s)-9):

             if s[i:i+10] not in  d:

                 d[s[i:i+10]]= 1

             else:

                 d[s[i:i+10]]+= 1

         res =[]

         for i in d:

             if d[i]>1:

                 res.append(i)

         return res

巴特西

187. Repeated DNA Sequences(建立词典，遍历一遍 o(n))

最新文章

热门文章