Palindromic Substrings
Explore how to identify and count palindromic substrings within a string by applying dynamic programming techniques. Understand problem constraints and develop an optimized approach to solve this common coding interview question.
We'll cover the following...
Statement
Given a string, s, return the number of palindromic substrings contained in it. A substring is a contiguous sequence of characters in a string. A palindrome is a phrase, word, or sequence that reads the same forward and backward.
Constraints:
s.lengthsconsists of only lowercase English characters.
Examples
Understand the problem
Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:
What is the number of palindromic substrings in the string “car”?
1
2
3
4
Figure it out!
We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.
Try it yourself
Implement your solution in the following coding playground.
def count_palindromic_substrings(s):# Replace this placeholder return statement with your codereturn -1