Even Length Palindrome

Everything about Even Length Palindrome

1. Count Palindromic Strings with Constraints

   Learn how to count palindromic strings of length up to n using the first k lowercase English letters, where no character appears more than twice. This article explains the key palindrome observations, separates even and odd-length cases, derives the permutation formulas, and provides an efficient Java solution using modular arithmetic. The solution achieves O(k) time complexity and O(1) auxiliary space.

   Sandhiya PriyaSep 22,4721,000Article