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[Python] Coding Interview Patterns: Unpublished Lessons

Solution: Longest Palindromic Substring

Let’s solve the Longest Palindromic Substring problem using the Dynamic Programming pattern.

We'll cover the following...

Statement

Given a string s, return the longest palindromic substring in s.

Constraints

  • 1≤1 \leq s.length ≤1000\leq 1000

  • s consist of only digits and English letters.

Solution

So far, you’ve probably brainstormed some approaches and have an idea of how to solve this problem. Let’s ...

A naive approach to this problem is to find all possible substrings and select one longest palindromic substring. For example, consider the string “deed”, which contains 10 substrings: “d”, “e”, “e”, “d”, “de”, “ee”, “ed”, “dee”, “eed”, and “deed”. Out of ...