Solution: Longest Common Subsequence
Explore how to find the longest common subsequence between two strings using a top-down dynamic programming approach. Understand how memoization reduces redundant calculations by storing intermediate results in a 2D table, improving the algorithm's efficiency. Gain insights into handling problem constraints and analyzing time and space complexity for this common coding interview challenge.
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