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

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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