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Palindromic Strings
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Articles about Palindromic Strings
- Article · Data Structures and Algorithms (DSA)
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.
