Repeated DNA sequence
Challenge 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 chain. Solution 1 - Iteration class Solution: def findRepeatedDnaSequences(self, s: str) -> List[str]: res = set() _set = set() for i in range(len(s)): seq = s[i:i+10] if seq in _set and seq not in res: res.add(seq) _set.add(seq) return res Time Complexity: 0(n*m) ...