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Grokking the Coding Interview Patterns in Python

Solution: Repeated DNA Sequences

Understand how to apply the sliding window pattern to find repeated 10-letter substrings in a DNA sequence. This lesson guides you through using a fixed-size window and hash map to track occurrences, ensuring efficient time and space complexity suitable for coding interviews.

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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:

  • 1≤1 \leq s.length ≤105 ...