43. Longest common subsequence - Part B
The chapter delves into the complexities of determining the longest common subsequence (LCS) between two sequences, emphasizing the algorithmic dependencies involved in deriving solutions. It illustrates how the dynamic programming approach can be utilized to fill up a solution table while tracking the origins of solutions for reconstructing the LCS efficiently. This is achieved by analyzing cell dependencies and incrementally building up the solution through comparisons between elements of the sequences.
Sections
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What we have learnt
- The longest common subsequence can be calculated using dynamic programming techniques which involve creating a table of solutions.
- Dependencies in computing the LCS require careful tracking of matched elements and their indices.
- Reconstructing the actual LCS requires following the path of diagonal steps in the table that correspond to matches.
Key Concepts
- -- Longest Common Subsequence (LCS)
- LCS is a standard problem in computer science that involves finding the longest subsequence present in two sequences.
- -- Dynamic Programming
- A method for solving complex problems by breaking them down into simpler subproblems and storing the results to avoid redundant computations.
- -- Dependencies in LCS Table
- The manner in which the calculations for a cell in the LCS table rely on the values of adjacent cells, reflecting the choices made during the comparison of subsequences.
Additional Learning Materials
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