README.md

Dynamic Pattern Matching

Implementation of the algorithms described in my MSc. Represents a dynamic pattern, subject to character insertion and deletion. Building for a text of size $n$ takes $\mathcal O(n)$ time, and each character insertion or deletion takes $\mathcal O(\log n)$ time, with high probability. Computing the number of matches or indices of matches takes constant time.

Example

#include "src/alg/matching.cpp"

dyn_pattern::matching m("aabaacaadaabaaba");
m.insert(0, "aaba");
for (int i = 0; i < m.matches(); i++)
	std::cout << m.match_idx(i) << std::endl;
m.erase(2);
std::cout << m.matches() << std::endl;

Output:

12
9
0
0

Note that the matches returned by match_idx might not be sorted.

Run make for a demonstration of the algorithm, using the first $10^7$ digits of $\pi$ as the text. Other texts incude:

• make pi2: $10^8$ digits of $\pi$;
• make bible: the bible;
• make casmurro: Dom Casmurro, a famous brazilian book by Machado de Assis.