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update ch5
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12 files changed

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12 files changed

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‎ch5/10_TrieSET/CMakeLists.txt

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@@ -3,5 +3,5 @@ project(10_TrieSET)
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set(CMAKE_CXX_STANDARD 14)
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6-
set(SOURCE_FILES main.cpp ../head/LSD.h ../head/MSD.h ../head/TST.h ../head/AmericanFlag.h ../head/AmericanFlagX.h)
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set(SOURCE_FILES main.cpp ../head/LSD.h ../head/MSD.h ../head/TST.h ../head/AmericanFlag.h ../head/AmericanFlagX.h ../head/KMP.h ../head/BoyerMoore.h ../head/RabinKarp.h)
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add_executable(10_TrieSET ${SOURCE_FILES})

‎ch5/12_KMP/CMakeLists.txt

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cmake_minimum_required(VERSION 3.8)
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project(12_KMP)
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set(CMAKE_CXX_STANDARD 14)
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set(SOURCE_FILES main.cpp ../head/LSD.h ../head/MSD.h ../head/TST.h)
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add_executable(12_KMP ${SOURCE_FILES})

‎ch5/12_KMP/main.cpp

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#include "../head/KMP.h"
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#include <iostream>
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#include <fstream>
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using namespace std;
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/**
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* Takes a pattern string and an input string as command-line arguments;
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* searches for the pattern string in the text string; and prints
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* the first occurrence of the pattern string in the text string.
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*
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* @param args the command-line arguments
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*/
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int main() {
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string pat = "abracadabra";
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string txt = "abacadabrabracabracadabrabrabracad";
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vector<char> pattern(pat.c_str(), pat.c_str() + pat.size());
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vector<char> text(txt.c_str(), txt.c_str() + txt.size());
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KMP kmp1(pat);
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int offset1 = kmp1.search(txt);
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KMP kmp2(pattern, 256);
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int offset2 = kmp2.search(text);
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// print results
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cout << "text: " << txt << endl;
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cout << "pattern: ";
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for (int i = 0; i < offset1; i++)
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cout << " ";
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cout << pat << endl;
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cout << "pattern: ";
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for (int i = 0; i < offset2; i++)
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cout << " ";
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cout << pat << endl;
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}

‎ch5/13_BoyerMoore/CMakeLists.txt

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cmake_minimum_required(VERSION 3.8)
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project(13_BoyerMoore)
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set(CMAKE_CXX_STANDARD 14)
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set(SOURCE_FILES main.cpp ../head/LSD.h ../head/MSD.h ../head/TST.h)
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add_executable(13_BoyerMoore ${SOURCE_FILES})

‎ch5/13_BoyerMoore/main.cpp

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#include "../head/BoyerMoore.h"
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#include <iostream>
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#include <fstream>
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using namespace std;
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/**
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* Takes a pattern string and an input string as command-line arguments;
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* searches for the pattern string in the text string; and prints
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* the first occurrence of the pattern string in the text string.
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*
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* @param args the command-line arguments
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*/
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int main() {
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string pat = "abracadabra";
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string txt = "abacadabrabracabracadabrabrabracad";
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vector<char> pattern(pat.c_str(), pat.c_str() + pat.size());
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vector<char> text(txt.c_str(), txt.c_str() + txt.size());
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BoyerMoore boyermoore1(pat);
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BoyerMoore boyermoore2(pattern, 256);
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int offset1 = boyermoore1.search(txt);
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int offset2 = boyermoore2.search(text);
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// print results
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cout << "text: " + txt << endl;
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cout << "pattern: ";
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for (int i = 0; i < offset1; i++)
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cout << " ";
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cout << pat << endl;
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cout << "pattern: ";
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for (int i = 0; i < offset2; i++)
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cout << " ";
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cout << pat << endl;
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}

‎ch5/14_RabinKarp/CMakeLists.txt

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cmake_minimum_required(VERSION 3.8)
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project(14_RabinKarp)
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set(CMAKE_CXX_STANDARD 14)
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set(SOURCE_FILES main.cpp ../head/LSD.h ../head/MSD.h ../head/TST.h)
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add_executable(14_RabinKarp ${SOURCE_FILES})

‎ch5/14_RabinKarp/main.cpp

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#include "../head/RabinKarp.h"
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#include <iostream>
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#include <fstream>
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using namespace std;
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/**
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* Takes a pattern string and an input string as command-line arguments;
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* searches for the pattern string in the text string; and prints
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* the first occurrence of the pattern string in the text string.
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*
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* @param args the command-line arguments
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*/
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int main() {
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string pat = "abracadabra";
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string txt = "abacadabrabracabracadabrabrabracad";
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RabinKarp searcher(pat);
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int offset = searcher.search(txt);
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// print results
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cout << "text: " + txt << endl;
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// from brute force search method 1
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cout << "pattern: ";
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for (int i = 0; i < offset; i++)
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cout << " ";
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cout << pat << endl;
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}

‎ch5/3_LSD/CMakeLists.txt

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3,5 +3,5 @@ project(3_LSD)
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set(CMAKE_CXX_STANDARD 14)
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6-
set(SOURCE_FILES main.cpp ../head/LSD.h ../head/MSD.h ../head/InplaceMSD.h)
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set(SOURCE_FILES main.cpp ../head/LSD.h ../head/MSD.h ../head/InplaceMSD.h ../head/Quick3string.h ../head/TrieST.h ../head/temp.h ../head/TrieSET.h)
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add_executable(3_LSD ${SOURCE_FILES})

‎ch5/CMakeLists.txt

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@@ -15,6 +15,9 @@ add_subdirectory(8_AmericanFlagX)
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add_subdirectory(9_TrieST)
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add_subdirectory(10_TrieSET)
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add_subdirectory(11_TST)
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add_subdirectory(12_KMP)
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add_subdirectory(13_BoyerMoore)
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add_subdirectory(14_RabinKarp)
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add_subdirectory(temp)

‎ch5/head/BoyerMoore.h

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#ifndef CH5_BOYERMOORE_H
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#define CH5_BOYERMOORE_H
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#include <vector>
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#include <string>
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using std::vector;
8+
using std::string;
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/**
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* The {@code BoyerMoore} class finds the first occurrence of a pattern string
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* in a text string.
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* <p>
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* This implementation uses the Boyer-Moore algorithm (with the bad-character
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* rule, but not the strong good suffix rule).
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* <p>
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* For additional documentation,
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* see <a href="https://algs4.cs.princeton.edu/53substring">Section 5.3</a> of
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* <i>Algorithms, 4th Edition</i> by Robert Sedgewick and Kevin Wayne.
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*/
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class BoyerMoore {
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public:
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/**
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* Preprocesses the pattern string.
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*
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* @param pat the pattern string
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*/
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BoyerMoore(string pat) : R(256), pat(pat), right(R, -1) {
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// position of rightmost occurrence of c in the pattern
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for (int j = 0; j < pat.length(); j++)
31+
right[pat[j]] = j;
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}
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/**
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* Preprocesses the pattern string.
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*
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* @param pattern the pattern string
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* @param R the alphabet size
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*/
40+
BoyerMoore(vector<char> pattern, int R) : R(R), pattern(pattern), right(R, -1) {
41+
for (int j = 0; j < pattern.size(); j++)
42+
right[pattern[j]] = j;
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}
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/**
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* Returns the index of the first occurrrence of the pattern string
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* in the text string.
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*
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* @param txt the text string
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* @return the index of the first occurrence of the pattern string
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* in the text string; n if no such match
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*/
53+
int search(string txt) {
54+
int m = pat.length();
55+
int n = txt.length();
56+
int skip;
57+
for (int i = 0; i <= n - m; i += skip) {
58+
skip = 0;
59+
for (int j = m - 1; j >= 0; j--) {
60+
if (pat[j] != txt[i + j]) {
61+
skip = std::max(1, j - right[txt[i + j]]);
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break;
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}
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}
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if (skip == 0) return i; // found
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}
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return n; // not found
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}
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/**
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* Returns the index of the first occurrrence of the pattern string
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* in the text string.
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*
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* @param text the text string
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* @return the index of the first occurrence of the pattern string
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* in the text string; n if no such match
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*/
78+
int search(vector<char> &text) {
79+
int m = pattern.size();
80+
int n = text.size();
81+
int skip;
82+
for (int i = 0; i <= n - m; i += skip) {
83+
skip = 0;
84+
for (int j = m - 1; j >= 0; j--) {
85+
if (pattern[j] != text[i + j]) {
86+
skip = std::max(1, j - right[text[i + j]]);
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break;
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}
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}
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if (skip == 0) return i; // found
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}
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return n; // not found
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}
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private:
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int R; // the radix
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vector<int> right; // the bad-character skip array
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vector<char> pattern; // store the pattern as a character array
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string pat; // or as a string
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};
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#endif //CH5_BOYERMOORE_H

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