A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric characters ...

// 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 ...

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.