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