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Repeated DNA Sequences

medium Solve on LeetCode

Last edited: August 1, 2025

Problem
Examples
Solution
Method 1 – Brute Force Using HashSet
Intuition
Approach
Code
Complexity
Method 2 - Using Hashset but with StringBuilder
Method 2 – HashSet with StringBuilder (or Mutable String)
Intuition
Approach
Code
Complexity
Method 3 - Using Hashset and Bit Representation
Dry Run (Step-by-step Bit Manipulation)
Method 3 – HashSet and Bit Manipulation (Rolling Hash)
Intuition
Approach
Code
Dry Run Example
Complexity

Related Tags

bit-manipulation bits hash-function hash-table leetcode rolling-hash sliding-window string

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