Code RoomLongest common subsequence
MediumPrep Room Coding #1597

Longest common subsequence

CodingAlgorithms & data structuresMid–Senior~25 min

Given two strings, return the length of their longest common subsequence.

Implement
longest_common_subsequence(a: str, b: str) → int
Examples
in["abcde","ace"]out3
What a strong answer looks like

State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.

0:00 of about 25 min
InputExpectedGot
["abcde","ace"]3not run yetsample