diff --git a/tasks/ostrovskaya-sf/lab_5/.gitignore b/tasks/ostrovskaya-sf/lab_5/.gitignore
new file mode 100644
index 0000000..104b544
--- /dev/null
+++ b/tasks/ostrovskaya-sf/lab_5/.gitignore
@@ -0,0 +1,484 @@
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
+## Get latest from `dotnet new gitignore`
+
+# dotenv files
+.env
+
+# User-specific files
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Mono auto generated files
+mono_crash.*
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+# Visual Studio 2015/2017 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# Visual Studio 2017 auto generated files
+Generated\ Files/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUnit
+*.VisualState.xml
+TestResult.xml
+nunit-*.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# Benchmark Results
+BenchmarkDotNet.Artifacts/
+
+# .NET
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# Tye
+.tye/
+
+# ASP.NET Scaffolding
+ScaffoldingReadMe.txt
+
+# StyleCop
+StyleCopReport.xml
+
+# Files built by Visual Studio
+*_i.c
+*_p.c
+*_h.h
+*.ilk
+*.meta
+*.obj
+*.iobj
+*.pch
+*.pdb
+*.ipdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*_wpftmp.csproj
+*.log
+*.tlog
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# Visual Studio Trace Files
+*.e2e
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# AxoCover is a Code Coverage Tool
+.axoCover/*
+!.axoCover/settings.json
+
+# Coverlet is a free, cross platform Code Coverage Tool
+coverage*.json
+coverage*.xml
+coverage*.info
+
+# Visual Studio code coverage results
+*.coverage
+*.coveragexml
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# Note: Comment the next line if you want to checkin your web deploy settings,
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# NuGet Symbol Packages
+*.snupkg
+# The packages folder can be ignored because of Package Restore
+**/[Pp]ackages/*
+# except build/, which is used as an MSBuild target.
+!**/[Pp]ackages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/[Pp]ackages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+*.appx
+*.appxbundle
+*.appxupload
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!?*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.jfm
+*.pfx
+*.publishsettings
+orleans.codegen.cs
+
+# Including strong name files can present a security risk
+# (https://github.com/github/gitignore/pull/2483#issue-259490424)
+#*.snk
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+ServiceFabricBackup/
+*.rptproj.bak
+
+# SQL Server files
+*.mdf
+*.ldf
+*.ndf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+*.rptproj.rsuser
+*- [Bb]ackup.rdl
+*- [Bb]ackup ([0-9]).rdl
+*- [Bb]ackup ([0-9][0-9]).rdl
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+node_modules/
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+*.vbw
+
+# Visual Studio 6 auto-generated project file (contains which files were open etc.)
+*.vbp
+
+# Visual Studio 6 workspace and project file (working project files containing files to include in project)
+*.dsw
+*.dsp
+
+# Visual Studio 6 technical files
+*.ncb
+*.aps
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# CodeRush personal settings
+.cr/personal
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Tabs Studio
+*.tss
+
+# Telerik's JustMock configuration file
+*.jmconfig
+
+# BizTalk build output
+*.btp.cs
+*.btm.cs
+*.odx.cs
+*.xsd.cs
+
+# OpenCover UI analysis results
+OpenCover/
+
+# Azure Stream Analytics local run output
+ASALocalRun/
+
+# MSBuild Binary and Structured Log
+*.binlog
+
+# NVidia Nsight GPU debugger configuration file
+*.nvuser
+
+# MFractors (Xamarin productivity tool) working folder
+.mfractor/
+
+# Local History for Visual Studio
+.localhistory/
+
+# Visual Studio History (VSHistory) files
+.vshistory/
+
+# BeatPulse healthcheck temp database
+healthchecksdb
+
+# Backup folder for Package Reference Convert tool in Visual Studio 2017
+MigrationBackup/
+
+# Ionide (cross platform F# VS Code tools) working folder
+.ionide/
+
+# Fody - auto-generated XML schema
+FodyWeavers.xsd
+
+# VS Code files for those working on multiple tools
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+*.code-workspace
+
+# Local History for Visual Studio Code
+.history/
+
+# Windows Installer files from build outputs
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# JetBrains Rider
+*.sln.iml
+.idea
+
+##
+## Visual studio for Mac
+##
+
+
+# globs
+Makefile.in
+*.userprefs
+*.usertasks
+config.make
+config.status
+aclocal.m4
+install-sh
+autom4te.cache/
+*.tar.gz
+tarballs/
+test-results/
+
+# Mac bundle stuff
+*.dmg
+*.app
+
+# content below from: https://github.com/github/gitignore/blob/master/Global/macOS.gitignore
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# content below from: https://github.com/github/gitignore/blob/master/Global/Windows.gitignore
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# Vim temporary swap files
+*.swp
diff --git a/tasks/ostrovskaya-sf/lab_5/README.md b/tasks/ostrovskaya-sf/lab_5/README.md
new file mode 100644
index 0000000..0eff6d1
--- /dev/null
+++ b/tasks/ostrovskaya-sf/lab_5/README.md
@@ -0,0 +1,73 @@
+# Отчет по лабораторной работе №5
+
+Выполнила студентка гр. ИСЭбд-41 Островская С.Ф.
+
+## Создание приложения
+
+Было выбрано консольное приложение, язык программирования - c#.
+
+Обычный алгоритм:
+
+```cs
+static int[][] MultiplyMatrix(int[][] matrix1, int[][] matrix2)
+{
+ int rows = matrix1.Length;
+ int columns = matrix2[0].Length;
+ int[][] result = new int[rows][];
+ for (int i = 0; i < rows; i++)
+ {
+ result[i] = new int[columns];
+ for (int j = 0; j < columns; j++)
+ {
+ result[i][j] = 0;
+ for (int k = 0; k < matrix1[i].Length; k++)
+ {
+ result[i][j] += matrix1[i][k] * matrix2[k][j];
+ }
+ }
+ }
+ return result;
+}
+```
+Параллельный алгоритм:
+
+```cs
+static int[][] MultiplyMatrixParallel(int[][] matrix1, int[][] matrix2, int numThreads)
+{
+ int rows = matrix1.Length;
+ int columns = matrix2[0].Length;
+ int[][] result = new int[rows][];
+
+
+ Parallel.For(0, rows, new ParallelOptions { MaxDegreeOfParallelism = numThreads }, i =>
+ {
+ result[i] = new int[columns];
+ for (int j = 0; j < columns; j++)
+ {
+ result[i][j] = 0;
+ Parallel.For(0, matrix1[i].Length, k =>
+ {
+ result[i][j] += matrix1[i][k] * matrix2[k][j];
+ });
+ }
+ });
+ return result;
+}
+```
+
+![](pic/pic1.jpg)
+![](pic/pic2.jpg)
+
+В результате обычный алгоритм выполнился за ``0,0002112`` секунды, а паралелльный за ``0,0064956`` секунды.
+
+## Бенчмарки
+
+Протестируем обычный и параллельный алгоритмы на матрицах различных размеров: 100х100, 300х300 и 500х500.
+
+Количество потоков: ``4``
+![](pic/pic3.jpg)
+
+Количество потоков: ``12``
+![](pic/pic4.jpg)
+
+``Вывод``: Обыный алгоритм работает быстрее, если количество элементов не слишком много. Параллельный же алгоритм работает быстрее только при наличии большого количества операций и данных. Оптимальное количество потоков для эффективной работы - 12.
\ No newline at end of file
diff --git a/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix.sln b/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix.sln
new file mode 100644
index 0000000..27d04a3
--- /dev/null
+++ b/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34330.188
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "lab_5_matrix", "lab_5_matrix\lab_5_matrix.csproj", "{A71D963B-1625-458C-A90F-5DB95C03B17C}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|Any CPU = Debug|Any CPU
+ Release|Any CPU = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {A71D963B-1625-458C-A90F-5DB95C03B17C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {A71D963B-1625-458C-A90F-5DB95C03B17C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {A71D963B-1625-458C-A90F-5DB95C03B17C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {A71D963B-1625-458C-A90F-5DB95C03B17C}.Release|Any CPU.Build.0 = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(SolutionProperties) = preSolution
+ HideSolutionNode = FALSE
+ EndGlobalSection
+ GlobalSection(ExtensibilityGlobals) = postSolution
+ SolutionGuid = {1A186ABB-2B32-4398-9A58-04ED799B0B80}
+ EndGlobalSection
+EndGlobal
diff --git a/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix/Program.cs b/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix/Program.cs
new file mode 100644
index 0000000..4ca92df
--- /dev/null
+++ b/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix/Program.cs
@@ -0,0 +1,192 @@
+using System;
+using System.Threading.Tasks;
+using System.Diagnostics;
+
+class Program
+{
+ static void Main()
+ {
+ Console.WriteLine("Задания: \n1. проверка умножения матриц;\n2. бэнчмарки;");
+ Console.Write("Введите номер задания: ");
+ int numTask = int.Parse(Console.ReadLine());
+ if (numTask == 1)
+ {
+ int[][] matrix1 = GenerateMatrix(10);
+ int[][] matrix2 = GenerateMatrix(10);
+
+ Console.WriteLine();
+ PrintMatrix(matrix1); // Вывод результата
+ Console.WriteLine();
+ PrintMatrix(matrix2); // Вывод результата
+
+ // Вводим количество потоков вручную
+ Console.WriteLine();
+ Console.Write("Введите количество потоков: ");
+ int numThreads = int.Parse(Console.ReadLine());
+ Console.WriteLine();
+
+ Stopwatch sw1 = new Stopwatch();
+ sw1.Start();
+ int[][] resultSequential = MultiplyMatrix(matrix1, matrix2); // Вызов обычного алгоритма
+ sw1.Stop();
+
+ Stopwatch sw2 = new Stopwatch();
+ sw2.Start();
+ int[][] resultParallel = MultiplyMatrixParallel(matrix1, matrix2, numThreads); // Вызов параллельного алгоритма
+ sw2.Stop();
+
+ Console.WriteLine("Выполнение обычного алгоритма");
+ PrintMatrix(resultSequential); // Вывод результата
+ TimeSpan elapsedTime1 = sw1.Elapsed;
+ Console.WriteLine($"Время выполнения: {elapsedTime1.TotalSeconds:F7} с");
+
+ Console.WriteLine("\nВыполнение параллельного алгоритма");
+ PrintMatrix(resultParallel); // Вывод результата
+ TimeSpan elapsedTime2 = sw2.Elapsed;
+ Console.WriteLine($"Время выполнения: {elapsedTime2.TotalSeconds:F7} с");
+
+ Console.ReadLine();
+ }
+ else if (numTask == 2)
+ {
+ int[][] matrix1 = GenerateMatrix(100);
+ int[][] matrix2 = GenerateMatrix(100);
+
+ Console.Write("Введите количество потоков: ");
+ int numThreads = int.Parse(Console.ReadLine());
+ Console.WriteLine();
+
+ Console.WriteLine("Размер матрицы: 100x100");
+
+ Console.WriteLine("\nПоследовательный алгоритм:");
+ Stopwatch sw1 = new Stopwatch();
+ sw1.Start();
+ int[][] resultSequential = MultiplyMatrix(matrix1, matrix2);
+ sw1.Stop();
+ TimeSpan elapsedTime1 = sw1.Elapsed;
+ Console.WriteLine($"Время выполнения: {elapsedTime1.TotalSeconds:F7} мс");
+
+ Console.WriteLine("\nПараллельный алгоритм:");
+ Stopwatch sw2 = new Stopwatch();
+ sw2.Start();
+ int[][] resultParallel = MultiplyMatrixParallel(matrix1, matrix2, numThreads);
+ sw2.Stop();
+ TimeSpan elapsedTime2 = sw2.Elapsed;
+ Console.WriteLine($"Время выполнения: {elapsedTime2.TotalSeconds:F7} с");
+
+ Console.WriteLine("\n------------------------------------------\n");
+
+ matrix1 = GenerateMatrix(300);
+ matrix2 = GenerateMatrix(300);
+
+ Console.WriteLine("Размер матрицы: 300x300");
+
+ Console.WriteLine("\nПоследовательный алгоритм:");
+ sw1.Restart();
+ resultSequential = MultiplyMatrix(matrix1, matrix2);
+ sw1.Stop();
+ elapsedTime1 = sw1.Elapsed;
+ Console.WriteLine($"Время выполнения: {elapsedTime1.TotalSeconds:F7} мс");
+
+ Console.WriteLine("\nПараллельный алгоритм:");
+ sw2.Restart();
+ resultParallel = MultiplyMatrixParallel(matrix1, matrix2, numThreads);
+ sw2.Stop();
+ elapsedTime2 = sw2.Elapsed;
+ Console.WriteLine($"Время выполнения: {elapsedTime2.TotalSeconds:F7} с");
+
+ Console.WriteLine("\n------------------------------------------\n");
+
+ matrix1 = GenerateMatrix(500);
+ matrix2 = GenerateMatrix(500);
+
+ Console.WriteLine("Размер матрицы: 500x500");
+
+ Console.WriteLine("\nПоследовательный алгоритм:");
+ sw1.Restart();
+ resultSequential = MultiplyMatrix(matrix1, matrix2);
+ sw1.Stop();
+ elapsedTime1 = sw1.Elapsed;
+ Console.WriteLine($"Время выполнения: {elapsedTime1.TotalSeconds:F7} мс");
+
+ Console.WriteLine("\nПараллельный алгоритм:");
+ sw2.Restart();
+ resultParallel = MultiplyMatrixParallel(matrix1, matrix2, numThreads);
+ sw2.Stop();
+ elapsedTime2 = sw2.Elapsed;
+ Console.WriteLine($"Время выполнения: {elapsedTime2.TotalSeconds:F7} с");
+
+ Console.ReadLine();
+
+ }
+ }
+
+ static int[][] GenerateMatrix(int size)
+ {
+ Random random = new Random();
+ int[][] matrix = new int[size][];
+ for (int i = 0; i < size; i++)
+ {
+ matrix[i] = new int[size];
+ for (int j = 0; j < size; j++)
+ {
+ matrix[i][j] = random.Next(1, 100);
+ }
+ }
+ return matrix;
+ }
+
+ static int[][] MultiplyMatrix(int[][] matrix1, int[][] matrix2)
+ {
+ int rows = matrix1.Length;
+ int columns = matrix2[0].Length;
+ int[][] result = new int[rows][];
+ for (int i = 0; i < rows; i++)
+ {
+ result[i] = new int[columns];
+ for (int j = 0; j < columns; j++)
+ {
+ result[i][j] = 0;
+ for (int k = 0; k < matrix1[i].Length; k++)
+ {
+ result[i][j] += matrix1[i][k] * matrix2[k][j];
+ }
+ }
+ }
+ return result;
+ }
+
+ static int[][] MultiplyMatrixParallel(int[][] matrix1, int[][] matrix2, int numThreads)
+ {
+ int rows = matrix1.Length;
+ int columns = matrix2[0].Length;
+ int[][] result = new int[rows][];
+
+
+ Parallel.For(0, rows, new ParallelOptions { MaxDegreeOfParallelism = numThreads }, i =>
+ {
+ result[i] = new int[columns];
+ for (int j = 0; j < columns; j++)
+ {
+ result[i][j] = 0;
+ Parallel.For(0, matrix1[i].Length, k =>
+ {
+ result[i][j] += matrix1[i][k] * matrix2[k][j];
+ });
+ }
+ });
+ return result;
+ }
+
+ static void PrintMatrix(int[][] matrix)
+ {
+ for (int i = 0; i < matrix.Length; i++)
+ {
+ for (int j = 0; j < matrix[i].Length; j++)
+ {
+ Console.Write(matrix[i][j] + " ");
+ }
+ Console.WriteLine();
+ }
+ }
+}
diff --git a/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix/lab_5_matrix.csproj b/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix/lab_5_matrix.csproj
new file mode 100644
index 0000000..2150e37
--- /dev/null
+++ b/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix/lab_5_matrix.csproj
@@ -0,0 +1,10 @@
+
+
+
+ Exe
+ net8.0
+ enable
+ enable
+
+
+
diff --git a/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix/obj/lab_5_matrix.csproj.nuget.dgspec.json b/tasks/ostrovskaya-sf/lab_5/lab_5_matrix/lab_5_matrix/obj/lab_5_matrix.csproj.nuget.dgspec.json
new file mode 100644
index 0000000..c9cbafc
--- /dev/null
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