Algorithms on Strings by Maxime Crochemore, Christophe Hancart, Thierry Lecroq

By Maxime Crochemore, Christophe Hancart, Thierry Lecroq

This article and reference on string strategies and development matching offers examples with regards to the automated processing of normal language, to the research of molecular sequences and to the administration of textual databases. Algorithms are defined in a C-like language, with correctness proofs and complexity research, to lead them to able to enforce. The publication can be an incredible source for college kids and researchers in theoretical computing device technological know-how, computational linguistics, computational biology, and software program engineering.

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Additional resources for Algorithms on Strings

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5 Basic pattern matching techniques February 8, 2007 29 The naive algorithm The simplest implementation of the sliding window mechanism is the so-called naive algorithm. The strategy consists here in considering a window of length m and in sliding it one position to the right after each attempt. This leads, if the comparison of the content of the window and of the string is correctly implemented, to an obviously correct algorithm. We give below the code of the algorithm. The variable j corresponds to the left position of the window on the text.

A naive method would consist in evaluating each value pref [i] independently of the previous values by direct comparisons; but it would then lead to a quadratic-time computation, in the case where x is the power of a single letter, for example. The utilization of already computed values yields a linear-time algorithm. For that, we introduce, the index i being fixed, two values g and f that constitute the key elements of the method. 5) f ∈ {j : 0 < j < i and j + pref [j ] = g}. 6) and We note that g and f are defined when i > 1.

One can deduce from the statement an algorithm for computing the table border knowing the table pref . 28 Let x ∈ A+ and j be a position on x. Then: border[j ] = 0 if I = ∅, j − min I + 1 otherwise, where I = {i : 0 < i ≤ j and i + pref [i] − 1 ≥ j }. Proof We first note that, for 0 < i ≤ j , i ∈ I if and only if x[i . j ] pref x. Indeed, if i ∈ I , we have x[i . j ] pref x[i . i + pref [i] − 1] pref x, thus x[i . j ] pref x. Conversely, if x[i . j ] pref x, we deduce, by definition of pref [i], pref [i] ≥ j − i + 1.

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