Solution: Longest Common Subsequence
Explore how to solve the longest common subsequence problem using dynamic programming. Understand the top-down memoization technique and the use of a 2D table to efficiently compute the subsequence length while avoiding redundant calculations. Learn to balance time and space complexity in string comparison problems.
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