LeetCode 187. Repeated DNA Sequences

The DNA sequence is composed of a series of nucleotides abbreviated as 'A', 'C', 'G', and 'T'.

Given a string s that represents a DNA sequence, return all the 10-letter-long sequences (substrings) that occur more than once in a DNA molecule. You may return the answer in any order.

Examples

Example 1

Input:  s = "AAAAACCCCCAAAAACCCCCCAAAAAGGGTTT"
Output: ["AAAAACCCCC", "CCCCCAAAAA"]

Example 2

Input:  s = "AAAAAAAAAAAAA"
Output: ["AAAAAAAAAA"]

Constraints

• 1 <= s.length <= 10^5
• s[i] is either 'A', 'C', 'G', or 'T'