Repeated DNA Sequences LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]

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Hello Programmers/Coders, Today we are going to share solutions to the Programming problems of LeetCode Solutions in C++, Java, & Python. At Each Problem with Successful submission with all Test Cases Passed, you will get a score or marks and LeetCode Coins. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for the Repeated DNA Sequences in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.

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LeetCode is one of the most well-known online judge platforms to help you enhance your skills, expand your knowledge and prepare for technical interviews. 

LeetCode is for software engineers who are looking to practice technical questions and advance their skills. Mastering the questions in each level on LeetCode is a good way to prepare for technical interviews and keep your skills sharp. They also have a repository of solutions with the reasoning behind each step.

LeetCode has over 1,900 questions for you to practice, covering many different programming concepts. Every coding problem has a classification of either EasyMedium, or Hard.

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  • Recursion, etc.

Leetcode has a huge number of test cases and questions from interviews too like Google, Amazon, Microsoft, Facebook, Adobe, Oracle, Linkedin, Goldman Sachs, etc. LeetCode helps you in getting a job in Top MNCs. To crack FAANG Companies, LeetCode problems can help you in building your logic.

Link for the ProblemRepeated DNA Sequences– LeetCode Problem

Repeated DNA Sequences– LeetCode Problem

Problem:

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

  • For example, "ACGAATTCCG" is a DNA sequence.

When studying DNA, it is useful to identify repeated sequences within the DNA.

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.

Example 1:

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

Example 2:

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

Constraints:

  • 1 <= s.length <= 105
  • s[i] is either 'A''C''G', or 'T'.
Repeated DNA Sequences– LeetCode Solutions
Repeated DNA Sequences Solution in C++:
class Solution {
 public:
  vector<string> findRepeatedDnaSequences(string s) {
    unordered_set<string> ans;
    unordered_set<string_view> seen;
    const string_view sv(s);

    for (int i = 0; i + 10 <= s.length(); ++i) {
      if (seen.count(sv.substr(i, 10)))
        ans.insert(s.substr(i, 10));
      seen.insert(sv.substr(i, 10));
    }

    return {begin(ans), end(ans)};
  }
};
Repeated DNA Sequences Solution in Java:
class Solution {
  public List<String> findRepeatedDnaSequences(String s) {
    Set<String> ans = new HashSet<>();
    Set<String> seen = new HashSet<>();

    for (int i = 0; i + 10 <= s.length(); ++i) {
      final String seq = s.substring(i, i + 10);
      if (seen.contains(seq))
        ans.add(seq);
      seen.add(seq);
    }

    return new ArrayList<>(ans);
  }
}
Repeated DNA Sequences Solution in Python:
class Solution:
  def findRepeatedDnaSequences(self, s: str) -> List[str]:
    ans = set()
    seen = set()

    for i in range(len(s) - 9):
      seq = s[i:i + 10]
      if seq in seen:
        ans.add(seq)
      seen.add(seq)

    return list(ans)
  • Time: O(10n) = O(n)O(10n)=O(n)
  • Space: O(10n) = O(n)O(10n)=O(n)

31 thoughts on “Repeated DNA Sequences LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]”

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