Solution: Longest Common Subsequence
Explore how to solve the longest common subsequence problem by applying dynamic programming techniques. Understand both naive and optimized recursive approaches, and learn to implement memoization to improve performance and reduce time complexity. This lesson helps you develop skills to efficiently compare two strings and store intermediate results using a 2D table, enhancing your ability to tackle similar coding interview challenges.
Statement
Suppose you are given two strings. You need to find the length of the longest common subsequence between these two strings.
A subsequence is a string formed by removing some characters from the original string while maintaining the relative position of the remaining characters. For example, “abd” is a subsequence of “abcd”, where the removed character is “c”.
If there is no common subsequence, then return 0.
Constraints:
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str1.length