Explain the difference between the longest common subsequence and the longest common substring.

  • Both are the same; the terms are interchangeable.
  • Longest common subsequence refers to the longest sequence of characters that appear in the same order in both strings, with not necessarily contiguous characters.
  • Longest common substring includes characters that appear in any order in both strings.
  • Longest common substring refers to the longest contiguous sequence of characters that appear in both strings.
The key difference is that the longest common subsequence (LCS) does not require contiguous characters; it considers the longest sequence of characters that appear in the same order in both strings, even if some characters are not contiguous. On the other hand, the longest common substring involves contiguous characters.
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