Longest Common Subsequence (2 Strings) - Dynamic Programming & Competing Subproblems

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Question: You are given 2 strings. Return the length of the longest subsequence that the 2 strings share.

Complexities

n = s1.length()
m = s2.length()

Time: O( nm )

We can upper bound time by the number of subproblems that we are going to solve.

Space: O( nm )

We upper bound space by the number of subproblems we will story answers to. Whether we do (n + 1)(m + 1) or (n)(m) doesn't matter asymptotically.
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