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Parameterized Pattern Matching -- Succinctly
Arnab Ganguly, Rahul Shah, Sharma V. Thankachan · 2016-03-24 · via cs.DS updates on arXiv.org

We consider the $Parameterized$ $Pattern$ $Matching$ problem, where a pattern $P$ matches some location in a text $\mathsf{T}$ iff there is a one-to-one correspondence between the alphabet symbols of the pattern to those of the text. More specifically, assume that the text $\mathsf{T}$ contains $n$ characters from a static alphabet $Σ_s$ and a parameterized alphabet $Σ_p$, where $Σ_s \cap Σ_p = \varnothing$ and $|Σ_s \cup Σ_p|=σ$. A pattern $P$ matches a substring $S$ of $\mathsf{T}$ iff the static characters match exactly, and there exists a one-to-one function that renames the parameterized characters in $S$ to that in $P$. Previous indexing solution [Baker, STOC 1993], known as $Parameterized$ $Suffix$ $Tree$, requires $Θ(n\log n)$ bits of space, and can find all $occ$ occurrences of $P$ in $\mathcal{O}(|P|\log σ+ occ)$ time. In this paper, we present the first succinct index that occupies $n \log σ+ \mathcal{O}(n)$ bits and answers queries in $\mathcal{O}((|P|+ occ\cdot \log n) \logσ\log \log σ)$ time. We also present a compact index that occupies $\mathcal{O}(n\logσ)$ bits and answers queries in $\mathcal{O}(|P|\log σ+ occ\cdot \log n)$ time. Furthermore, the techniques are extended to obtain the first succinct representation of the index of Shibuya for $Structural$ $Matching$ [SWAT, 2000], and of Idury and Schäffer for $Parameterized$ $Dictionary$ $Matching$ [CPM, 1994].