NaiveStringMatcher.cpp

Author: lxylxy123456

NaiveStringMatcher.cpp

@@ -0,0 +1,73 @@
+//  
+//  algorithm - some algorithms in "Introduction to Algorithms", third edition
+//  Copyright (C) 2018  lxylxy123456
+//  
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU Affero General Public License as
+//  published by the Free Software Foundation, either version 3 of the
+//  License, or (at your option) any later version.
+//  
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU Affero General Public License for more details.
+//  
+//  You should have received a copy of the GNU Affero General Public License
+//  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//  
+
+#ifndef MAIN
+#define MAIN
+#define MAIN_NaiveStringMatcher
+#endif
+
+#ifndef FUNC_NaiveStringMatcher
+#define FUNC_NaiveStringMatcher
+
+#include "utils.h"
+
+template <typename T>
+bool equal(const std::vector<T>& S, size_t Ss, 
+			const std::vector<T>& P, size_t Ps, size_t n) {
+	for (size_t i = 0; i < n; i++)
+		if (S[Ss + i] != P[Ps + i])
+			return false; 
+	return true; 
+}
+
+template <typename T>
+bool equal(const std::vector<T>& S, size_t Ss, size_t Se, 
+			const std::vector<T>& P, size_t Ps, size_t Pe) {
+	size_t n = Se - Ss; 
+	if (n != Pe - Ps)
+		return false; 
+	return equal(S, P, Ss, Ps, n); 
+}
+
+template <typename T>
+void NaiveStringMatcher(const std::vector<T>& S, const std::vector<T>& P, 
+						std::vector<size_t>& ans) {
+	size_t n = S.size(), m = P.size(); 
+	for (size_t s = 0; s <= n - m; s++)
+		if (equal(P, 0, S, s, m))
+			ans.push_back(s); 
+}
+#endif
+
+#ifdef MAIN_NaiveStringMatcher
+int main(int argc, char *argv[]) {
+	const size_t n = get_argv(argc, argv, 1, 40); 
+	const size_t m = get_argv(argc, argv, 2, 3); 
+	const size_t s = get_argv(argc, argv, 3, 2); 
+	std::vector<char> S, P; 
+	random_integers<char>(S, 'a', 'a' + s, n); 
+	random_integers<char>(P, 'a', 'a' + s, m); 
+	output_integers(S, ""); 
+	output_integers(P, ""); 
+	std::vector<size_t> ans; 
+	NaiveStringMatcher(S, P, ans); 
+	output_integers(ans); 
+	return 0; 
+}
+#endif
+

README.md

@@ -205,6 +205,7 @@
 | 31 | MillerRabin.cpp				| Witness								|  969 |
 | 31 | MillerRabin.cpp				| Miller Rabin							|  970 |
 | 31 | PollardRho.cpp				| Pollard Rho							|  977 |
+| 32 | NaiveStringMatcher.cpp		| Naive String Matcher					|  988 |
 
 # Supplementary Files
 * `utils.h`: Utils