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Solution: Repeated DNA Sequences

Explore the sliding window technique to identify repeated 10-letter DNA substrings in a sequence. This lesson guides you through using fixed-size windows and hash maps to track and return substrings appearing multiple times, helping you master a common coding interview pattern.

Statement

A DNA sequence consists of a series of nucleotides, each represented by one of the characters 'A', 'C', 'G', or 'T'.

Given a string s representing a DNA sequence, find and return all 1010-letter-long substrings that appear more than once within s. The result may be returned in any order.

Constraints:

  • 11 \leq s.length 105 ...