Given a string, find the longest substring that reads the same forwards and backwards. This classic problem appears everywhere: text editors implementing ‘find palindrome’ features, DNA sequence…
Read more →Before diving into the algorithm, let’s clarify terminology that trips up many engineers. A subsequence maintains relative order but allows gaps—from ‘character’, you can extract ‘car’ or ‘chr’….
Read more →The longest palindromic substring problem asks you to find the longest contiguous sequence of characters within a string that reads the same forwards and backwards. Given ‘babad’, valid answers…
Read more →