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Combinatorics
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Articles about Combinatorics
- Article · Data Structures and Algorithms (DSA)
Subsets with MEX in Range
Learn how to count array subsets whose MEX falls within a given range using frequencies, powers of two, and modular arithmetic in Java.
- 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.
