diff --git a/.gitignore b/.gitignore
index de72442..c4d1050 100644
--- a/.gitignore
+++ b/.gitignore
@@ -68,3 +68,5 @@
 /DSLib/Test/SegmentTree/Debug
 /DSLib/Deps
 /DSLib/out
+/DSLib/Client/FenwickTree/Debug
+/DSLib/Lib/FenwickTree/Debug
diff --git a/DSLib/Client/FenwickTree/FenwickTree.cpp b/DSLib/Client/FenwickTree/FenwickTree.cpp
new file mode 100644
index 0000000..66a6f7b
--- /dev/null
+++ b/DSLib/Client/FenwickTree/FenwickTree.cpp
@@ -0,0 +1,16 @@
+#include "FenwickTree.h"
+
+#include <iostream>
+
+int main(int argc, char* argv[])
+{
+	std::vector<std::size_t> data = { 1, 2, 3, 4, 5, 6, 7 };
+	ds::fen_tree f(data.size());
+	for (std::size_t i = 0; i < data.size(); ++i)
+	{
+		f.update_point(i + 1, data[i]);
+	}
+
+	std::cout << f.sum(data.size()) << std::endl;
+	return 0;
+}
diff --git a/DSLib/Client/FenwickTree/FenwickTree.vcxproj b/DSLib/Client/FenwickTree/FenwickTree.vcxproj
new file mode 100644
index 0000000..691fcd2
--- /dev/null
+++ b/DSLib/Client/FenwickTree/FenwickTree.vcxproj
@@ -0,0 +1,151 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>15.0</VCProjectVersion>
+    <ProjectGuid>{37248D29-4153-4C53-9BB8-DD16AB36C257}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>FenwickTree</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0.16299.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>"$(SolutionDir)Lib\FenwickTree"</AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>"$(SolutionDir)Lib\FenwickTree"</AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>"$(SolutionDir)Lib\FenwickTree"</AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>"$(SolutionDir)Lib\FenwickTree"</AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="FenwickTree.cpp" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
\ No newline at end of file
diff --git a/DSLib/Client/FenwickTree/FenwickTree.vcxproj.filters b/DSLib/Client/FenwickTree/FenwickTree.vcxproj.filters
new file mode 100644
index 0000000..0437fd5
--- /dev/null
+++ b/DSLib/Client/FenwickTree/FenwickTree.vcxproj.filters
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <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="FenwickTree.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/DSLib/DSLib.sln b/DSLib/DSLib.sln
index af69431..44fbe45 100644
--- a/DSLib/DSLib.sln
+++ b/DSLib/DSLib.sln
@@ -43,6 +43,10 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "SegmentTree", "Client\Segme
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "SegmentTree", "Test\SegmentTree\SegmentTree.vcxproj", "{A740815A-4E10-4116-A01E-73D71286FBA6}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "FenwickTree", "Lib\FenwickTree\FenwickTree.vcxproj", "{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "FenwickTree", "Client\FenwickTree\FenwickTree.vcxproj", "{37248D29-4153-4C53-9BB8-DD16AB36C257}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -179,6 +183,22 @@ Global
 		{A740815A-4E10-4116-A01E-73D71286FBA6}.Release|x64.Build.0 = Release|x64
 		{A740815A-4E10-4116-A01E-73D71286FBA6}.Release|x86.ActiveCfg = Release|Win32
 		{A740815A-4E10-4116-A01E-73D71286FBA6}.Release|x86.Build.0 = Release|Win32
+		{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F}.Debug|x64.ActiveCfg = Debug|x64
+		{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F}.Debug|x64.Build.0 = Debug|x64
+		{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F}.Debug|x86.ActiveCfg = Debug|Win32
+		{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F}.Debug|x86.Build.0 = Debug|Win32
+		{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F}.Release|x64.ActiveCfg = Release|x64
+		{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F}.Release|x64.Build.0 = Release|x64
+		{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F}.Release|x86.ActiveCfg = Release|Win32
+		{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F}.Release|x86.Build.0 = Release|Win32
+		{37248D29-4153-4C53-9BB8-DD16AB36C257}.Debug|x64.ActiveCfg = Debug|x64
+		{37248D29-4153-4C53-9BB8-DD16AB36C257}.Debug|x64.Build.0 = Debug|x64
+		{37248D29-4153-4C53-9BB8-DD16AB36C257}.Debug|x86.ActiveCfg = Debug|Win32
+		{37248D29-4153-4C53-9BB8-DD16AB36C257}.Debug|x86.Build.0 = Debug|Win32
+		{37248D29-4153-4C53-9BB8-DD16AB36C257}.Release|x64.ActiveCfg = Release|x64
+		{37248D29-4153-4C53-9BB8-DD16AB36C257}.Release|x64.Build.0 = Release|x64
+		{37248D29-4153-4C53-9BB8-DD16AB36C257}.Release|x86.ActiveCfg = Release|Win32
+		{37248D29-4153-4C53-9BB8-DD16AB36C257}.Release|x86.Build.0 = Release|Win32
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -201,6 +221,8 @@ Global
 		{EB5FC754-BC16-4B5E-80C3-3D7AC23A63D2} = {6FE9DCA5-B3F2-4593-B71E-3B9BC3A59723}
 		{4EBF5131-F65F-4F3B-8C78-A9706EE1F495} = {A97B1356-3EAC-40A4-B591-E557CA356147}
 		{A740815A-4E10-4116-A01E-73D71286FBA6} = {2943D6FC-5010-421B-9250-B7CC6BB2E118}
+		{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F} = {6FE9DCA5-B3F2-4593-B71E-3B9BC3A59723}
+		{37248D29-4153-4C53-9BB8-DD16AB36C257} = {A97B1356-3EAC-40A4-B591-E557CA356147}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {83EEE417-9039-4161-A830-DDDEECE454CD}
diff --git a/DSLib/Lib/FenwickTree/FenwickTree.cpp b/DSLib/Lib/FenwickTree/FenwickTree.cpp
new file mode 100644
index 0000000..089d6aa
--- /dev/null
+++ b/DSLib/Lib/FenwickTree/FenwickTree.cpp
@@ -0,0 +1 @@
+#include "FenwickTree.h"
\ No newline at end of file
diff --git a/DSLib/Lib/FenwickTree/FenwickTree.h b/DSLib/Lib/FenwickTree/FenwickTree.h
new file mode 100644
index 0000000..f94747f
--- /dev/null
+++ b/DSLib/Lib/FenwickTree/FenwickTree.h
@@ -0,0 +1,48 @@
+#pragma once
+#include <vector>
+
+namespace ds
+{
+	class fen_tree
+	{
+	public:
+		explicit fen_tree(const std::size_t size) :size_(size + 1)
+		{
+			f_.assign(size + 1, 0);
+		}
+
+		void update_point(std::size_t i, std::size_t value);
+		std::size_t sum(std::size_t i) const;
+		std::size_t range_sum(std::size_t i, std::size_t j) const;
+
+	private:
+		std::vector<std::size_t> f_;
+		std::size_t size_;
+	};
+
+	inline void fen_tree::update_point(std::size_t i, const std::size_t value)
+	{
+		while (i < size_)
+		{
+			f_[i] += value;
+			i += i & -i;
+		}
+	}
+
+	inline std::size_t fen_tree::sum(std::size_t i) const
+	{
+		std::size_t s = 0;
+		while (i > 0)
+		{
+			s += f_[i];
+			i -= i & -i;
+		}
+
+		return s;
+	}
+
+	inline std::size_t fen_tree::range_sum(std::size_t i, std::size_t j) const
+	{
+		return sum(j) - (i == 1 ? 0 : sum(i - 1));
+	}
+}
diff --git a/DSLib/Lib/FenwickTree/FenwickTree.vcxproj b/DSLib/Lib/FenwickTree/FenwickTree.vcxproj
new file mode 100644
index 0000000..dc60f11
--- /dev/null
+++ b/DSLib/Lib/FenwickTree/FenwickTree.vcxproj
@@ -0,0 +1,158 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>15.0</VCProjectVersion>
+    <ProjectGuid>{26B24EFB-1E93-4AC1-AB9C-D80C9FA76D0F}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>FenwickTree</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0.16299.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v141</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
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+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <LinkIncremental>true</LinkIncremental>
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+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
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+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClInclude Include="FenwickTree.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="FenwickTree.cpp" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
\ No newline at end of file
diff --git a/DSLib/Lib/FenwickTree/FenwickTree.vcxproj.filters b/DSLib/Lib/FenwickTree/FenwickTree.vcxproj.filters
new file mode 100644
index 0000000..c485a14
--- /dev/null
+++ b/DSLib/Lib/FenwickTree/FenwickTree.vcxproj.filters
@@ -0,0 +1,27 @@
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+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <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>
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+  <ItemGroup>
+    <ClInclude Include="FenwickTree.h">
+      <Filter>Header Files</Filter>
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+  <ItemGroup>
+    <ClCompile Include="FenwickTree.cpp">
+      <Filter>Source Files</Filter>
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+</Project>
\ No newline at end of file