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arXiv · 2510.16454

Online computation of normalized substring complexity

Gregory Kucherov·Yakov Nekrich
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Abstract

The normalized substring complexity $\delta$ of a string is defined as $\max_k \{c[k]/k\}$, where $c[k]$ is the number of \textit{distinct} substrings of length $k$. This simply defined measure has recently attracted attention due to its established relationship to popular string compression algorithms. We consider the problem of computing $\delta$ online, when the string is provided from a stream. We present two algorithms solving the problem: one working in $O(\log n)$ amortized time per character, and the other in $O(\log^3 n)$ worst-case time per character. To our knowledge, this is the first polylog-time online solution to this problem.

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BibTeXRIS

Gregory Kucherov, Yakov Nekrich. 2025-10-18. Online computation of normalized substring complexity. https://arxiv.org/abs/2510.16454

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