187. Repeated DNA Sequences

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

 

The DNA sequence is composed of a series of nucleotides abbreviated as 'A', 'C', 'G', and 'T'.

• For example, "ACGAATTCCG" is a DNA sequence.

When studying DNA, it is useful to identify repeated sequences within the DNA.

Given a string s that represents a DNA sequence, return all the 10-letter-long sequences (substrings) that occur more than once in a DNA molecule. You may return the answer in any order.

 

class Solution:
    def findRepeatedDnaSequences(self, s: str) -> List[str]:
        result = set()
        store = set()
        for start in range(len(s)):
            end = start + 10
            trim = s[start:end]
            if trim in store:
                result.add(trim)
            else:
                store.add(trim)
        return list(result)