Knuth–morris–pratt

Homework №11/Knuth–Morris–Pratt/Knuth–Morris–Pratt.sln

@@ -0,0 +1,31 @@
+
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+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Knuth–Morris–Pratt", "Knuth–Morris–Pratt\Knuth–Morris–Pratt.vcxproj", "{5C13E66F-7004-4B91-82CA-D62CAB4C2071}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
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+		{5C13E66F-7004-4B91-82CA-D62CAB4C2071}.Debug|x86.Build.0 = Debug|Win32
+		{5C13E66F-7004-4B91-82CA-D62CAB4C2071}.Release|x64.ActiveCfg = Release|x64
+		{5C13E66F-7004-4B91-82CA-D62CAB4C2071}.Release|x64.Build.0 = Release|x64
+		{5C13E66F-7004-4B91-82CA-D62CAB4C2071}.Release|x86.ActiveCfg = Release|Win32
+		{5C13E66F-7004-4B91-82CA-D62CAB4C2071}.Release|x86.Build.0 = Release|Win32
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+		SolutionGuid = {F66AE844-2478-4972-BBC9-7D9AFC17B3F7}
+	EndGlobalSection
+EndGlobal

Homework №11/Knuth–Morris–Pratt/Knuth–Morris–Pratt/KMP.c

@@ -0,0 +1,66 @@
+#include "KMP.h"
+#include <malloc.h>
+#include <string.h>
+
+int* findPrefix(char* substring, int* error)
+{
+	int* prefix = calloc(strlen(substring) + 1, sizeof(int));
+	if (prefix == NULL)
+	{
+		*error = 1;
+		return NULL;
+	}
+	prefix[0] = 0;
+	int i = 1;
+	int j = 0;
+	while (substring[i] != '\0')
+	{
+		if (substring[j] == substring[i])
+		{
+			prefix[i] = j + 1;
+			i++;
+			j++;
+		}
+		else if (j == 0)
+		{
+			prefix[i] = 0;
+			i++;
+		}
+		else
+		{
+			j = prefix[j - 1];
+		}
+	}
+	return prefix;
+}
+
+int algorithmKMP(char* string, char* substring, int* prefix)
+{
+	int counterForString = 0;
+	int CounterForSubstring = 0;
+	while (string[counterForString] != '\0')
+	{
+		if (string[counterForString] == substring[CounterForSubstring])
+		{
+			counterForString++;
+			CounterForSubstring++;
+			if (CounterForSubstring == strlen(substring))
+			{
+				return counterForString - strlen(substring) + 1;
+			}
+		}
+		else if (CounterForSubstring == 0)
+		{
+			counterForString++;
+			if (counterForString == strlen(string))
+			{
+				return -1;
+			}
+		}
+		else
+		{
+			CounterForSubstring = prefix[CounterForSubstring - 1];
+		}
+	}
+	return -1;
+}

Homework №11/Knuth–Morris–Pratt/Knuth–Morris–Pratt/KMP.h

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+#pragma once
+
+// Function for finding the maximum matching suffix and prefix
+int* findPrefix(char* substring, int* error);
+
+// Function for searching for a substring in a string
+int algorithmKMP(char* string, char* substring, int* prefix);

Homework №11/Knuth–Morris–Pratt/Knuth–Morris–Pratt/Knuth–Morris–Pratt.vcxproj

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+      <Platform>Win32</Platform>
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+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
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+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
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+    <Keyword>Win32Proj</Keyword>
+    <ProjectGuid>{5c13e66f-7004-4b91-82ca-d62cab4c2071}</ProjectGuid>
+    <RootNamespace>KnuthMorrisPratt</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
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+    <Link>
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+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
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+      <ConformanceMode>true</ConformanceMode>
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+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
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+      <FunctionLevelLinking>true</FunctionLevelLinking>
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+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
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+    <Link>
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+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
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+    <ClCompile Include="Main.c" />
+    <ClCompile Include="ReadFile.c" />
+    <ClCompile Include="ReadString.c" />
+    <ClCompile Include="TestKMP.c" />
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+    <ClInclude Include="KMP.h" />
+    <ClInclude Include="ReadFile.h" />
+    <ClInclude Include="ReadString.h" />
+    <ClInclude Include="TestKMP.h" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
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+</Project>

Homework №11/Knuth–Morris–Pratt/Knuth–Morris–Pratt/Knuth–Morris–Pratt.vcxproj.filters

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Исходные файлы">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Файлы заголовков">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
+    </Filter>
+    <Filter Include="Файлы ресурсов">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="ReadFile.c">
+      <Filter>Исходные файлы</Filter>
+    </ClCompile>
+    <ClCompile Include="ReadString.c">
+      <Filter>Исходные файлы</Filter>
+    </ClCompile>
+    <ClCompile Include="KMP.c">
+      <Filter>Исходные файлы</Filter>
+    </ClCompile>
+    <ClCompile Include="Main.c">
+      <Filter>Исходные файлы</Filter>
+    </ClCompile>
+    <ClCompile Include="TestKMP.c">
+      <Filter>Исходные файлы</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="ReadFile.h">
+      <Filter>Файлы заголовков</Filter>
+    </ClInclude>
+    <ClInclude Include="ReadString.h">
+      <Filter>Файлы заголовков</Filter>
+    </ClInclude>
+    <ClInclude Include="KMP.h">
+      <Filter>Файлы заголовков</Filter>
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+    <ClInclude Include="TestKMP.h">
+      <Filter>Файлы заголовков</Filter>
+    </ClInclude>
+  </ItemGroup>
+</Project>

Homework №11/Knuth–Morris–Pratt/Knuth–Morris–Pratt/Main.c

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+#include "KMP.h"
+#include "ReadString.h"
+#include "ReadFile.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include "TestKMP.h"
+
+int main()
+{
+    if (!testKMP())
+    {
+        printf("Test failed");
+        return -1;
+    }
+    printf("enter the substring\n");
+    int error = 0;
+    char* substring = readString(&error);
+    if (error == 1)
+    {
+        printf("memory not allocated");
+        return -1;
+    }
+    char* string = readFile("Text.txt", &error);
+    if (error == 1)
+    {
+        free(substring);
+        printf("memory not allocated");
+        return -1;
+    }
+    if (error == 2)
+    {
+        free(substring);
+        printf("file not found");
+        return -1;
+    }
+    int* prefix = findPrefix(substring, &error);
+    if (error == 1)
+    {
+        free(string);
+        free(substring);
+        printf("memory not allocated");
+        return -1;
+    }
+    const int result = algorithmKMP(string, substring, prefix);
+    free(substring);
+    free(string);
+    free(prefix);
+    printf("the position of the first occurrence of the substring in the string (-1 if there is no occurrence) = %d", result);
+}