Medium
Quiz
#187 Repeated DNA Sequences
APPROACH
The DNA sequence is composed of a series of nucleotides abbreviated as 'A', 'C', 'G', and 'T'.
- For example, "ACGAATTCCG" is a DNA sequence.
Given a DNA string s, return all 10-letter-long sequences (substrings) that occur more than once. You may return the answer in any order.
Example 1:
Input: s = "AAAAACCCCCAAAAACCCCCCAAAAAGGGTTT"
Output: ["AAAAACCCCC","CCCCCAAAAA"]
Example 2:
Input: s = "AAAAAAAAAAAAA"
Output: ["AAAAAAAAAA"]
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What is the optimal approach for this problem?