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Leetcode Problem 187. Repeated DNA Sequences

187. Repeated DNA Sequences

Leetcode Solutions

Approach: Linear-time Slice Using Substring + HashSet

  1. Initialize an empty hashset to store unique 10-letter sequences.
  2. Initialize an empty list to store the result of repeated sequences.
  3. Iterate over the DNA sequence string with a sliding window of length 10.
  4. For each window, check if the sequence is in the hashset.
    • If it is, add it to the result list if it's not already there.
    • If it is not, add the sequence to the hashset.
  5. Return the result list containing all the repeated sequences.
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Approach: Rabin-Karp: Constant-time Slice Using Rolling Hash

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