// Given a string s, return the number of palindromic substrings in it. // A string is a palindrome when it reads the same backward as forward. // A substring is a contiguous sequence of characters ...

* Explanation: s is an empty string "" after removing non-alphanumeric characters. * Since an empty string reads the same forward and backward, it is a palindrome. Approach M-1: 1. Replace all ...

LeetCode’s Java ecosystem is evolving beyond mere algorithmic correctness, with a growing emphasis on code quality metrics such as readability, maintainability, and performance profiling.