diff --git a/feladat3/IFPQYY_feladat3V1/IFPQYY_feladat3V1.zip b/feladat3/IFPQYY_feladat3V1/IFPQYY_feladat3V1.zip
new file mode 100644
index 0000000..abac7ed
Binary files /dev/null and b/feladat3/IFPQYY_feladat3V1/IFPQYY_feladat3V1.zip differ
diff --git a/feladat3/IFPQYY_feladat3V1/UnitTest1.cpp b/feladat3/IFPQYY_feladat3V1/UnitTest1.cpp
new file mode 100644
index 0000000..ddb15a0
--- /dev/null
+++ b/feladat3/IFPQYY_feladat3V1/UnitTest1.cpp
@@ -0,0 +1,113 @@
+// IFPQYY | Tóth Dániel Mátyás | V1
+#include "pch.h"
+#include "CppUnitTest.h"
+#include "feladat3.h"
+
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+
+namespace UnitTest1
+{
+	TEST_CLASS(UnitTest1)
+	{
+	public:
+		char infn[MYMAXFILES][MYMAXFN] = {};
+		char outfn[MYMAXFILES][MYMAXFN] = {};
+		static unsigned char buf[MYBUFSIZE];
+		unsigned short minv, maxv, avgv, nv;
+
+		
+		TEST_METHOD(InvalidFileParameter)
+		{
+			char* argv[] = {
+				"",
+				"doesntexist"
+			};
+			Assert::AreEqual(GetFilenames(2, argv, infn, outfn), NOK);
+		}
+		TEST_METHOD(AllValidFileParameter)
+		{
+			char* argv[] = {
+				"",
+				"C:\\Users\\danit\\Desktop\\2026-27-cpp-homework\\feladat3\\UnitTest1\\datasets.txt" 
+				//couldn't find the working directory :(
+			};
+			Assert::AreEqual(GetFilenames(2, argv, infn, outfn), OK);
+		}
+		TEST_METHOD(NoFileParameter)
+		{
+			char* argv[] = {
+				""
+			};
+			Assert::AreEqual(GetFilenames(1, argv, infn, outfn), NOK);
+		}
+		TEST_METHOD(EmptyFile)
+		{
+			char* argv[] = {
+				"",
+				"C:\\Users\\danit\\Desktop\\2026-27-cpp-homework\\feladat3\\UnitTest1\\empty.txt"
+			};
+			Assert::AreEqual(GetFilenames(2, argv, infn, outfn), NOK);
+		}
+		TEST_METHOD(InvalidFile)
+		{
+			char* argv[] = {
+				"",
+				"C:\\Users\\danit\\Desktop\\2026-27-cpp-homework\\feladat3\\UnitTest1\\bad.txt"
+			};
+			Assert::AreEqual(GetFilenames(2, argv, infn, outfn), NOK);
+		}
+		TEST_METHOD(SortSomeMoodleFiles)
+		{
+			char infn[MYMAXFILES][MYMAXFN] = {};
+			char outfn[MYMAXFILES][MYMAXFN] = {};
+			static unsigned char buf[MYBUFSIZE];
+			unsigned short minv, maxv, avgv, nv;
+			char* argv[] = {
+				"",
+				"C:\\Users\\danit\\Desktop\\2026-27-cpp-homework\\feladat3\\UnitTest1\\somedatasets.txt"
+			};
+			GetFilenames(2, argv, infn, outfn); //valid files, too lazyto write in by hand
+			for (int n = 0; (n < MYMAXFILES) && (infn[n][0] != '\0'); n++)
+			{
+				Assert::AreEqual(SortFile(infn[n], outfn[n], buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true), OK);
+			}
+		}
+		TEST_METHOD(SortAllMoodleFiles)
+		{
+			char infn[MYMAXFILES][MYMAXFN] = {};
+			char outfn[MYMAXFILES][MYMAXFN] = {};
+			static unsigned char buf[MYBUFSIZE];
+			unsigned short minv, maxv, avgv, nv;
+			char* argv[] = {
+				"",
+				"C:\\Users\\danit\\Desktop\\2026-27-cpp-homework\\feladat3\\UnitTest1\\datasets.txt"
+			};
+			GetFilenames(2, argv, infn, outfn); //also valid files
+			for (int n = 0; (n < MYMAXFILES) && (infn[n][0] != '\0'); n++)
+			{
+				Assert::AreEqual(SortFile(infn[n], outfn[n], buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true), OK);
+			}
+		}
+		TEST_METHOD(NullPtrs)
+		{
+			for (int n = 0; (n < MYMAXFILES) && (infn[n][0] != '\0'); n++)
+			{
+				Assert::AreEqual(SortFile(nullptr, nullptr, nullptr, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true), NOK);
+			}
+		}
+		TEST_METHOD(InvalidFileNames)
+		{
+			static unsigned char buf[MYBUFSIZE];
+			unsigned short minv, maxv, avgv, nv;
+			Assert::AreEqual(SortFile("bad", "morebad", buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true), NOK);
+		}
+		TEST_METHOD(BadBufferSize)
+		{
+			char infn[MYMAXFILES][MYMAXFN] = {};
+			char outfn[MYMAXFILES][MYMAXFN] = {};
+			static unsigned char buf[2];
+			unsigned short minv, maxv, avgv, nv;
+			Assert::AreEqual(SortFile(infn[0], outfn[0], buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true), NOK);
+		}
+	};
+}
diff --git a/feladat3/IFPQYY_feladat3V1/feladat3.cpp b/feladat3/IFPQYY_feladat3V1/feladat3.cpp
new file mode 100644
index 0000000..e7b5b8b
--- /dev/null
+++ b/feladat3/IFPQYY_feladat3V1/feladat3.cpp
@@ -0,0 +1,221 @@
+// IFPQYY | Tóth Dániel Mátyás | V1
+#include <iostream>
+#include <fstream>
+#include <filesystem>
+#include "feladat3.h"
+using namespace std;
+
+static int CopyStr(char* dest, const char* src, const char* concat = "\0");
+static void BubbleSort(unsigned char* arr, int len);
+
+int GetFilenames(int argc, char* argv[],
+		char infilenames[MYMAXFILES][MYMAXFN], 
+		char outfilenames[MYMAXFILES][MYMAXFN]) {
+	if (argc != 2 || argv == nullptr || infilenames == nullptr 
+		|| outfilenames == nullptr) {
+		return NOK;
+	}
+
+	cout << "Parameter allomany:\n" << argv[1] << '\n';
+	ifstream argifs(argv[1]);
+	if (!argifs.is_open())
+	{
+		cout << "Nem lehet megnyitni a " << argv[1] << " nevu allomanyt\n";
+		return NOK;
+	}
+	int readAmount = 0;
+	int i = 0;
+	char buf[MYMAXFN-1];
+	cout << "Feldolgozando allomanyok:\n";
+	while (readAmount < 5 && argifs.getline(buf, MYMAXFN-1))
+	{
+		readAmount++;
+		ifstream inputfile(buf);
+		if (!inputfile.fail())
+		{
+			CopyStr(infilenames[i], buf);
+			CopyStr(outfilenames[i], buf, ".srt");
+			cout << infilenames[i] << " " << outfilenames[i] << "\tOK\n";
+			i++;
+		}
+		else
+		{
+			cout << "<" << buf << ">" << "\tNOK\n";
+		}
+	}
+	argifs.close();
+	int status = OK;
+	if (i == 0)
+	{
+		status = NOK;
+		cout << "Ures\tNOK\n";
+	}
+	while (i < 5) {
+		infilenames[i][0] = '\0';
+		outfilenames[i][0] = '\0';
+		i++;
+	}
+	cout << "*DONE\n";
+	return status;
+}
+
+static int CopyStr(char* dest, const char* src, const char* concat) {
+	if (dest == nullptr || src == nullptr) {
+		return NOK;
+	}
+	int i = 0;
+	while (src[i] != '\0')
+	{
+		dest[i++] = src[i];
+	}
+	int j = 0;
+	while (concat[j] != '\0')
+	{
+		dest[i++] = concat[j++];
+	}
+	dest[i] = '\0';
+	return OK;
+}
+
+int SortFile(char* infn, char* outfn, unsigned char* buf,
+		unsigned short* pmin, unsigned short* pmax,
+		unsigned short* pavg, unsigned short* pn,
+		unsigned short bufsize, bool test) {
+	if (infn == nullptr || outfn == nullptr 
+		|| buf == nullptr || pmin == nullptr 
+		|| pmax == nullptr || pavg == nullptr 
+		|| pn == nullptr) // there has to be a better way than this
+	{
+		return NOK;
+	}
+	if (bufsize != MYBUFSIZE) // I guess?
+	{
+		return NOK;
+	}
+
+	ifstream readifs(infn, ios_base::binary);
+	ofstream outofs(outfn, ios_base::binary);
+	if (!readifs.is_open() || outofs.bad())
+	{
+		return NOK;
+	}
+	unsigned short files[16][MYBUFSIZE/2]; //this is probably a terrible solution. too bad!
+	int filesizes[16] = { 0 };
+	int ptrshifts[16] = { 0 };
+
+	*pmin = MYMAXVALUE;
+	*pmax = 0;
+	*pavg = 0;
+	*pn = filesystem::file_size(infn)/2; // this can't be more than MYMAXVALUE anyways, so warning dully ignored
+
+	if (test)
+	{
+		cout << "\nSTART: " << infn << " ----> " << outfn << "\n";
+		cout << "*READ\n";
+	}
+
+	unsigned short n;
+	int i = 0;
+	int j = 0;
+	int usedfilescnt = 0;
+	while (readifs.read((char*)&n, sizeof(n))) {
+		if (*pmax < n) {
+			*pmax = n;
+		}
+		if (*pmin > n) {
+			*pmin = n;
+		}
+		*pavg += n;
+		buf[(i * 2) % (MYBUFSIZE)] = n;
+		buf[((i * 2)+1) % (MYBUFSIZE)] = n >> 8;
+		if (test)
+		{
+			cout << i << ".\t" << n << "\n";
+		}
+		i++;
+		if (i % (MYBUFSIZE / 2) == 0)
+		{
+			BubbleSort(buf, MYBUFSIZE);
+			while (j < MYBUFSIZE/2)
+			{
+				files[usedfilescnt][j] = buf[j * 2] + buf[(j * 2) + 1] * 256;
+				j++;
+			}
+			filesizes[usedfilescnt] = MYBUFSIZE / 2;
+			usedfilescnt++;
+			j = 0;
+		}
+	}
+	readifs.close();
+
+	int size = (*pn * 2) % MYBUFSIZE;
+	BubbleSort(buf, size);
+	while (j < size / 2)
+	{
+		files[usedfilescnt][j] = buf[j * 2] + buf[(j * 2) + 1] * 256;
+		j++;
+	}
+	filesizes[usedfilescnt] = size/2;
+	usedfilescnt++;
+
+	if (test)
+	{
+		cout << "\n*SORT, WRITE\n";
+	}
+
+	i = 0;
+	while (i < *pn)
+	{
+		int savedJ = 0;
+		unsigned short smallest = MYMAXVALUE;
+		for (j = 0; j < usedfilescnt; j++)
+		{
+			if (ptrshifts[j] >= filesizes[j])
+			{
+				continue;
+			}
+			if (files[j][ptrshifts[j]] < smallest)
+			{
+				smallest = files[j][ptrshifts[j]];
+				savedJ = j;
+			}
+		}
+		if (test)
+		{
+			cout << i << ".\t" << smallest << "\n";
+		}
+		outofs.write((char *)&smallest, sizeof(smallest));
+		ptrshifts[savedJ]++;
+		i++;
+	}
+
+
+	*pavg = *pavg / *pn;
+
+	if (test)
+	{
+		cout << "\n*DONE\n";
+	}
+	return OK;
+}
+
+static void BubbleSort(unsigned char* arr, int len) { //note: this is a char*. you need to sort unsigned short*. kill 7 billion people
+	for (int i = 0; i < len / 2; i++)
+	{
+		for (int j = 0; j < (len / 2) - i - 1; j++)
+		{
+			unsigned short first = arr[j * 2] + arr[j * 2 + 1] * 256;
+			unsigned short second = arr[(j + 1) * 2] + arr[(j + 1) * 2 + 1] * 256;
+			if (first > second)
+			{
+				unsigned char temp = arr[j * 2];
+				arr[j * 2] = arr[(j + 1) * 2];
+				arr[(j + 1) * 2] = temp;
+
+				temp = arr[j * 2 + 1];
+				arr[j * 2 + 1] = arr[(j + 1) * 2 + 1];
+				arr[(j + 1) * 2 + 1] = temp;
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/feladat3/IFPQYY_feladat3V1/feladat3.h b/feladat3/IFPQYY_feladat3V1/feladat3.h
new file mode 100644
index 0000000..97f28e5
--- /dev/null
+++ b/feladat3/IFPQYY_feladat3V1/feladat3.h
@@ -0,0 +1,15 @@
+// IFPQYY | Tóth Dániel Mátyás | V1
+#pragma once
+#define MYBUFSIZE	8192
+#define MYMAXVALUE	65535
+#define MYMAXFILES	5
+#define MYMAXFN		128
+#define OK			0
+#define NOK			(-1)
+int GetFilenames(int argc, char* argv[], 
+	char infilenames[MYMAXFILES][MYMAXFN], 
+	char outfilenames[MYMAXFILES][MYMAXFN]);
+int SortFile(char* infn, char* outfn, unsigned char* buf,
+	unsigned short* pmin, unsigned short* pmax,
+	unsigned short* pavg, unsigned short* pn,
+	unsigned short bufsize = MYBUFSIZE, bool test = false);
diff --git a/feladat3/IFPQYY_feladat3V1/main.cpp b/feladat3/IFPQYY_feladat3V1/main.cpp
new file mode 100644
index 0000000..7e388de
--- /dev/null
+++ b/feladat3/IFPQYY_feladat3V1/main.cpp
@@ -0,0 +1,27 @@
+// IFPQYY | Tóth Dániel Mátyás | V1
+#include "feladat3.h"
+#include <iostream>
+using namespace std;
+
+int main(int argc, char* argv[]) {
+	char infn[MYMAXFILES][MYMAXFN];
+	char outfn[MYMAXFILES][MYMAXFN];
+	static unsigned char buf[MYBUFSIZE];
+	unsigned short minv, maxv, avgv, nv;
+	if (GetFilenames(argc, argv, infn, outfn) == NOK)
+	{
+		return(NOK);
+	}
+	for (int n = 0; (n < MYMAXFILES) && (infn[n][0] != '\0'); n++)
+	{
+		if (SortFile(infn[n], outfn[n], buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true) == NOK)
+			return(NOK);
+	}
+	/*cout << argc;
+	for (size_t i = 0; i < argc; i++)
+	{
+		cout << '\n';
+		cout << argv[i];
+	}*/
+	return(OK);
+}
\ No newline at end of file
diff --git a/feladat3/UnitTest1/UnitTest1.cpp b/feladat3/UnitTest1/UnitTest1.cpp
new file mode 100644
index 0000000..ddb15a0
--- /dev/null
+++ b/feladat3/UnitTest1/UnitTest1.cpp
@@ -0,0 +1,113 @@
+// IFPQYY | Tóth Dániel Mátyás | V1
+#include "pch.h"
+#include "CppUnitTest.h"
+#include "feladat3.h"
+
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+
+namespace UnitTest1
+{
+	TEST_CLASS(UnitTest1)
+	{
+	public:
+		char infn[MYMAXFILES][MYMAXFN] = {};
+		char outfn[MYMAXFILES][MYMAXFN] = {};
+		static unsigned char buf[MYBUFSIZE];
+		unsigned short minv, maxv, avgv, nv;
+
+		
+		TEST_METHOD(InvalidFileParameter)
+		{
+			char* argv[] = {
+				"",
+				"doesntexist"
+			};
+			Assert::AreEqual(GetFilenames(2, argv, infn, outfn), NOK);
+		}
+		TEST_METHOD(AllValidFileParameter)
+		{
+			char* argv[] = {
+				"",
+				"C:\\Users\\danit\\Desktop\\2026-27-cpp-homework\\feladat3\\UnitTest1\\datasets.txt" 
+				//couldn't find the working directory :(
+			};
+			Assert::AreEqual(GetFilenames(2, argv, infn, outfn), OK);
+		}
+		TEST_METHOD(NoFileParameter)
+		{
+			char* argv[] = {
+				""
+			};
+			Assert::AreEqual(GetFilenames(1, argv, infn, outfn), NOK);
+		}
+		TEST_METHOD(EmptyFile)
+		{
+			char* argv[] = {
+				"",
+				"C:\\Users\\danit\\Desktop\\2026-27-cpp-homework\\feladat3\\UnitTest1\\empty.txt"
+			};
+			Assert::AreEqual(GetFilenames(2, argv, infn, outfn), NOK);
+		}
+		TEST_METHOD(InvalidFile)
+		{
+			char* argv[] = {
+				"",
+				"C:\\Users\\danit\\Desktop\\2026-27-cpp-homework\\feladat3\\UnitTest1\\bad.txt"
+			};
+			Assert::AreEqual(GetFilenames(2, argv, infn, outfn), NOK);
+		}
+		TEST_METHOD(SortSomeMoodleFiles)
+		{
+			char infn[MYMAXFILES][MYMAXFN] = {};
+			char outfn[MYMAXFILES][MYMAXFN] = {};
+			static unsigned char buf[MYBUFSIZE];
+			unsigned short minv, maxv, avgv, nv;
+			char* argv[] = {
+				"",
+				"C:\\Users\\danit\\Desktop\\2026-27-cpp-homework\\feladat3\\UnitTest1\\somedatasets.txt"
+			};
+			GetFilenames(2, argv, infn, outfn); //valid files, too lazyto write in by hand
+			for (int n = 0; (n < MYMAXFILES) && (infn[n][0] != '\0'); n++)
+			{
+				Assert::AreEqual(SortFile(infn[n], outfn[n], buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true), OK);
+			}
+		}
+		TEST_METHOD(SortAllMoodleFiles)
+		{
+			char infn[MYMAXFILES][MYMAXFN] = {};
+			char outfn[MYMAXFILES][MYMAXFN] = {};
+			static unsigned char buf[MYBUFSIZE];
+			unsigned short minv, maxv, avgv, nv;
+			char* argv[] = {
+				"",
+				"C:\\Users\\danit\\Desktop\\2026-27-cpp-homework\\feladat3\\UnitTest1\\datasets.txt"
+			};
+			GetFilenames(2, argv, infn, outfn); //also valid files
+			for (int n = 0; (n < MYMAXFILES) && (infn[n][0] != '\0'); n++)
+			{
+				Assert::AreEqual(SortFile(infn[n], outfn[n], buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true), OK);
+			}
+		}
+		TEST_METHOD(NullPtrs)
+		{
+			for (int n = 0; (n < MYMAXFILES) && (infn[n][0] != '\0'); n++)
+			{
+				Assert::AreEqual(SortFile(nullptr, nullptr, nullptr, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true), NOK);
+			}
+		}
+		TEST_METHOD(InvalidFileNames)
+		{
+			static unsigned char buf[MYBUFSIZE];
+			unsigned short minv, maxv, avgv, nv;
+			Assert::AreEqual(SortFile("bad", "morebad", buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true), NOK);
+		}
+		TEST_METHOD(BadBufferSize)
+		{
+			char infn[MYMAXFILES][MYMAXFN] = {};
+			char outfn[MYMAXFILES][MYMAXFN] = {};
+			static unsigned char buf[2];
+			unsigned short minv, maxv, avgv, nv;
+			Assert::AreEqual(SortFile(infn[0], outfn[0], buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true), NOK);
+		}
+	};
+}
diff --git a/feladat3/UnitTest1/UnitTest1.vcxproj b/feladat3/UnitTest1/UnitTest1.vcxproj
new file mode 100644
index 0000000..f463d0f
--- /dev/null
+++ b/feladat3/UnitTest1/UnitTest1.vcxproj
@@ -0,0 +1,192 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" 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>18.0</VCProjectVersion>
+    <ProjectGuid>{5768658D-5753-57BE-9F55-89088097DC31}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>UnitTest1</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+    <ProjectSubType>NativeUnitTestProject</ProjectSubType>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v145</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+    <UseOfMfc>false</UseOfMfc>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v145</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+    <UseOfMfc>false</UseOfMfc>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v145</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+    <UseOfMfc>false</UseOfMfc>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v145</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+    <UseOfMfc>false</UseOfMfc>
+  </PropertyGroup>
+  <Import Project="$(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|x64'">
+    <LinkIncremental>true</LinkIncremental>
+    <IncludePath>C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\feladat3;$(IncludePath)</IncludePath>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Manifest>
+      <EnableSegmentHeap>true</EnableSegmentHeap>
+    </Manifest>
+    <ClCompile>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <SDLCheck>true</SDLCheck>
+      <AdditionalIncludeDirectories>$(VCInstallDir)UnitTest\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>WIN32;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <UseFullPaths>true</UseFullPaths>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <AdditionalLibraryDirectories>$(VCInstallDir)UnitTest\lib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Manifest>
+      <EnableSegmentHeap>true</EnableSegmentHeap>
+    </Manifest>
+    <ClCompile>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <AdditionalIncludeDirectories>$(VCInstallDir)UnitTest\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>WIN32;NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <UseFullPaths>true</UseFullPaths>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalLibraryDirectories>$(VCInstallDir)UnitTest\lib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Manifest>
+      <EnableSegmentHeap>true</EnableSegmentHeap>
+    </Manifest>
+    <ClCompile>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <SDLCheck>true</SDLCheck>
+      <AdditionalIncludeDirectories>$(VCInstallDir)UnitTest\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <UseFullPaths>true</UseFullPaths>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <AdditionalLibraryDirectories>C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\feladat3\x64\Debug;$(VCInstallDir)UnitTest\lib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
+      <AdditionalDependencies>feladat3;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Manifest>
+      <EnableSegmentHeap>true</EnableSegmentHeap>
+    </Manifest>
+    <ClCompile>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <AdditionalIncludeDirectories>$(VCInstallDir)UnitTest\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <UseFullPaths>true</UseFullPaths>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalLibraryDirectories>$(VCInstallDir)UnitTest\lib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="pch.cpp">
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Create</PrecompiledHeader>
+    </ClCompile>
+    <ClCompile Include="UnitTest1.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="pch.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\feladat3\feladat3.vcxproj">
+      <Project>{05ad42de-8f96-4351-b07d-784a20d752bd}</Project>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
\ No newline at end of file
diff --git a/feladat3/UnitTest1/UnitTest1.vcxproj.filters b/feladat3/UnitTest1/UnitTest1.vcxproj.filters
new file mode 100644
index 0000000..f041cae
--- /dev/null
+++ b/feladat3/UnitTest1/UnitTest1.vcxproj.filters
@@ -0,0 +1,30 @@
+<?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;c++;cppm;ixx;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;h++;hm;inl;inc;ipp;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="UnitTest1.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="pch.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="pch.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/feladat3/UnitTest1/dataset/testin10.dat b/feladat3/UnitTest1/dataset/testin10.dat
new file mode 100644
index 0000000..8ac7eca
Binary files /dev/null and b/feladat3/UnitTest1/dataset/testin10.dat differ
diff --git a/feladat3/UnitTest1/dataset/testin10.dat.srt b/feladat3/UnitTest1/dataset/testin10.dat.srt
new file mode 100644
index 0000000..3dc756c
Binary files /dev/null and b/feladat3/UnitTest1/dataset/testin10.dat.srt differ
diff --git a/feladat3/UnitTest1/dataset/testin100.dat b/feladat3/UnitTest1/dataset/testin100.dat
new file mode 100644
index 0000000..e5b3cb3
Binary files /dev/null and b/feladat3/UnitTest1/dataset/testin100.dat differ
diff --git a/feladat3/UnitTest1/dataset/testin100.dat.srt b/feladat3/UnitTest1/dataset/testin100.dat.srt
new file mode 100644
index 0000000..daf0768
Binary files /dev/null and b/feladat3/UnitTest1/dataset/testin100.dat.srt differ
diff --git a/feladat3/UnitTest1/dataset/testin10000.dat b/feladat3/UnitTest1/dataset/testin10000.dat
new file mode 100644
index 0000000..43d5279
Binary files /dev/null and b/feladat3/UnitTest1/dataset/testin10000.dat differ
diff --git a/feladat3/UnitTest1/dataset/testin10000.dat.srt b/feladat3/UnitTest1/dataset/testin10000.dat.srt
new file mode 100644
index 0000000..7d01a70
Binary files /dev/null and b/feladat3/UnitTest1/dataset/testin10000.dat.srt differ
diff --git a/feladat3/UnitTest1/dataset/testin5.dat b/feladat3/UnitTest1/dataset/testin5.dat
new file mode 100644
index 0000000..0bea184
--- /dev/null
+++ b/feladat3/UnitTest1/dataset/testin5.dat
@@ -0,0 +1 @@
+”kÜ~:#q/#
\ No newline at end of file
diff --git a/feladat3/UnitTest1/dataset/testin5.dat.srt b/feladat3/UnitTest1/dataset/testin5.dat.srt
new file mode 100644
index 0000000..bf81402
--- /dev/null
+++ b/feladat3/UnitTest1/dataset/testin5.dat.srt
@@ -0,0 +1 @@
+#:#q/”kÜ~
\ No newline at end of file
diff --git a/feladat3/UnitTest1/dataset/testin50.dat b/feladat3/UnitTest1/dataset/testin50.dat
new file mode 100644
index 0000000..abd7b60
--- /dev/null
+++ b/feladat3/UnitTest1/dataset/testin50.dat
@@ -0,0 +1 @@
+krc0ŽCÆâ.ri‰HŸH9S*9<
7s)oPMíLH
Yµ
D-Äy*&øp€O>*r]DFt^PßuXû+á!Ëëiß<!ézF>ù}±pƒUÎ8™?a'Óp(<
\ No newline at end of file
diff --git a/feladat3/UnitTest1/dataset/testin50.dat.srt b/feladat3/UnitTest1/dataset/testin50.dat.srt
new file mode 100644
index 0000000..c079bf6
--- /dev/null
+++ b/feladat3/UnitTest1/dataset/testin50.dat.srt
@@ -0,0 +1 @@
+ÆËßµ
r<!á!*&a's)*>*û+D-â.c0
7Î8(<9<F>™?ŽCDFH‰HŸHíLPM€OP9SƒUX
Yr]t^riëiko±pÓpøpßuÄyézù}
\ No newline at end of file
diff --git a/feladat3/UnitTest1/datasets.txt b/feladat3/UnitTest1/datasets.txt
new file mode 100644
index 0000000..05bd48a
--- /dev/null
+++ b/feladat3/UnitTest1/datasets.txt
@@ -0,0 +1,5 @@
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin5.dat
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin10.dat
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin50.dat
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin100.dat
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin10000.dat
\ No newline at end of file
diff --git a/feladat3/UnitTest1/empty.txt b/feladat3/UnitTest1/empty.txt
new file mode 100644
index 0000000..e69de29
diff --git a/feladat3/UnitTest1/pch.cpp b/feladat3/UnitTest1/pch.cpp
new file mode 100644
index 0000000..64b7eef
--- /dev/null
+++ b/feladat3/UnitTest1/pch.cpp
@@ -0,0 +1,5 @@
+// pch.cpp: source file corresponding to the pre-compiled header
+
+#include "pch.h"
+
+// When you are using pre-compiled headers, this source file is necessary for compilation to succeed.
diff --git a/feladat3/UnitTest1/pch.h b/feladat3/UnitTest1/pch.h
new file mode 100644
index 0000000..9d715b0
--- /dev/null
+++ b/feladat3/UnitTest1/pch.h
@@ -0,0 +1,12 @@
+// pch.h: This is a precompiled header file.
+// Files listed below are compiled only once, improving build performance for future builds.
+// This also affects IntelliSense performance, including code completion and many code browsing features.
+// However, files listed here are ALL re-compiled if any one of them is updated between builds.
+// Do not add files here that you will be updating frequently as this negates the performance advantage.
+
+#ifndef PCH_H
+#define PCH_H
+
+// add headers that you want to pre-compile here
+
+#endif //PCH_H
diff --git a/feladat3/UnitTest1/somedatasets.txt b/feladat3/UnitTest1/somedatasets.txt
new file mode 100644
index 0000000..bec27e2
--- /dev/null
+++ b/feladat3/UnitTest1/somedatasets.txt
@@ -0,0 +1,8 @@
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin5.dat
+no
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin10.dat
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin50.dat
+
+
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin100.dat
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin10000.dat
\ No newline at end of file
diff --git a/feladat3/feladat3.slnx b/feladat3/feladat3.slnx
index 353f8ac..24585b8 100644
--- a/feladat3/feladat3.slnx
+++ b/feladat3/feladat3.slnx
@@ -4,4 +4,5 @@
     <Platform Name="x86" />
   </Configurations>
   <Project Path="feladat3/feladat3.vcxproj" Id="05ad42de-8f96-4351-b07d-784a20d752bd" />
+  <Project Path="UnitTest1/UnitTest1.vcxproj" />
 </Solution>
diff --git a/feladat3/feladat3/dataset/testin10.dat.srt b/feladat3/feladat3/dataset/testin10.dat.srt
new file mode 100644
index 0000000..3dc756c
Binary files /dev/null and b/feladat3/feladat3/dataset/testin10.dat.srt differ
diff --git a/feladat3/feladat3/dataset/testin100.dat.srt b/feladat3/feladat3/dataset/testin100.dat.srt
new file mode 100644
index 0000000..daf0768
Binary files /dev/null and b/feladat3/feladat3/dataset/testin100.dat.srt differ
diff --git a/feladat3/feladat3/dataset/testin10000.dat.srt b/feladat3/feladat3/dataset/testin10000.dat.srt
new file mode 100644
index 0000000..e69de29
diff --git a/feladat3/feladat3/dataset/testin5.dat.srt b/feladat3/feladat3/dataset/testin5.dat.srt
new file mode 100644
index 0000000..bf81402
--- /dev/null
+++ b/feladat3/feladat3/dataset/testin5.dat.srt
@@ -0,0 +1 @@
+#:#q/”kÜ~
\ No newline at end of file
diff --git a/feladat3/feladat3/dataset/testin50.dat.srt b/feladat3/feladat3/dataset/testin50.dat.srt
new file mode 100644
index 0000000..c079bf6
--- /dev/null
+++ b/feladat3/feladat3/dataset/testin50.dat.srt
@@ -0,0 +1 @@
+ÆËßµ
r<!á!*&a's)*>*û+D-â.c0
7Î8(<9<F>™?ŽCDFH‰HŸHíLPM€OP9SƒUX
Yr]t^riëiko±pÓpøpßuÄyézù}
\ No newline at end of file
diff --git a/feladat3/feladat3/datasets.txt b/feladat3/feladat3/datasets.txt
index 339ae98..05bd48a 100644
--- a/feladat3/feladat3/datasets.txt
+++ b/feladat3/feladat3/datasets.txt
@@ -1,12 +1,5 @@
-dataset\testin5.dat
-
-
-C:\nonexistent.dum
-dataset\testin10.dat
-
-dataset\testin50.dat
-dataset\testin100.dat
-
-dataset\testin10000.dat
-
-
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin5.dat
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin10.dat
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin50.dat
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin100.dat
+C:\Users\danit\Desktop\2026-27-cpp-homework\feladat3\UnitTest1\dataset\testin10000.dat
\ No newline at end of file
diff --git a/feladat3/feladat3/feladat3.cpp b/feladat3/feladat3/feladat3.cpp
index b65a098..e7b5b8b 100644
--- a/feladat3/feladat3/feladat3.cpp
+++ b/feladat3/feladat3/feladat3.cpp
@@ -6,6 +6,7 @@
 using namespace std;
 
 static int CopyStr(char* dest, const char* src, const char* concat = "\0");
+static void BubbleSort(unsigned char* arr, int len);
 
 int GetFilenames(int argc, char* argv[],
 		char infilenames[MYMAXFILES][MYMAXFN], 
@@ -44,7 +45,7 @@ int GetFilenames(int argc, char* argv[],
 	}
 	argifs.close();
 	int status = OK;
-	if (readAmount == 0)
+	if (i == 0)
 	{
 		status = NOK;
 		cout << "Ures\tNOK\n";
@@ -57,6 +58,7 @@ int GetFilenames(int argc, char* argv[],
 	cout << "*DONE\n";
 	return status;
 }
+
 static int CopyStr(char* dest, const char* src, const char* concat) {
 	if (dest == nullptr || src == nullptr) {
 		return NOK;
@@ -74,6 +76,7 @@ static int CopyStr(char* dest, const char* src, const char* concat) {
 	dest[i] = '\0';
 	return OK;
 }
+
 int SortFile(char* infn, char* outfn, unsigned char* buf,
 		unsigned short* pmin, unsigned short* pmax,
 		unsigned short* pavg, unsigned short* pn,
@@ -85,20 +88,134 @@ int SortFile(char* infn, char* outfn, unsigned char* buf,
 	{
 		return NOK;
 	}
-	if (bufsize != MYBUFSIZE) //I guess?
+	if (bufsize != MYBUFSIZE) // I guess?
 	{
 		return NOK;
 	}
 
-	ifstream argifs(infn, ios_base::binary);
-	if (!argifs.is_open())
+	ifstream readifs(infn, ios_base::binary);
+	ofstream outofs(outfn, ios_base::binary);
+	if (!readifs.is_open() || outofs.bad())
 	{
 		return NOK;
 	}
+	unsigned short files[16][MYBUFSIZE/2]; //this is probably a terrible solution. too bad!
+	int filesizes[16] = { 0 };
+	int ptrshifts[16] = { 0 };
 
-	int size = filesystem::file_size(infn);
-	cout << size;
-	short* allVals[MYMAXVALUE];
+	*pmin = MYMAXVALUE;
+	*pmax = 0;
+	*pavg = 0;
+	*pn = filesystem::file_size(infn)/2; // this can't be more than MYMAXVALUE anyways, so warning dully ignored
 
+	if (test)
+	{
+		cout << "\nSTART: " << infn << " ----> " << outfn << "\n";
+		cout << "*READ\n";
+	}
+
+	unsigned short n;
+	int i = 0;
+	int j = 0;
+	int usedfilescnt = 0;
+	while (readifs.read((char*)&n, sizeof(n))) {
+		if (*pmax < n) {
+			*pmax = n;
+		}
+		if (*pmin > n) {
+			*pmin = n;
+		}
+		*pavg += n;
+		buf[(i * 2) % (MYBUFSIZE)] = n;
+		buf[((i * 2)+1) % (MYBUFSIZE)] = n >> 8;
+		if (test)
+		{
+			cout << i << ".\t" << n << "\n";
+		}
+		i++;
+		if (i % (MYBUFSIZE / 2) == 0)
+		{
+			BubbleSort(buf, MYBUFSIZE);
+			while (j < MYBUFSIZE/2)
+			{
+				files[usedfilescnt][j] = buf[j * 2] + buf[(j * 2) + 1] * 256;
+				j++;
+			}
+			filesizes[usedfilescnt] = MYBUFSIZE / 2;
+			usedfilescnt++;
+			j = 0;
+		}
+	}
+	readifs.close();
+
+	int size = (*pn * 2) % MYBUFSIZE;
+	BubbleSort(buf, size);
+	while (j < size / 2)
+	{
+		files[usedfilescnt][j] = buf[j * 2] + buf[(j * 2) + 1] * 256;
+		j++;
+	}
+	filesizes[usedfilescnt] = size/2;
+	usedfilescnt++;
+
+	if (test)
+	{
+		cout << "\n*SORT, WRITE\n";
+	}
+
+	i = 0;
+	while (i < *pn)
+	{
+		int savedJ = 0;
+		unsigned short smallest = MYMAXVALUE;
+		for (j = 0; j < usedfilescnt; j++)
+		{
+			if (ptrshifts[j] >= filesizes[j])
+			{
+				continue;
+			}
+			if (files[j][ptrshifts[j]] < smallest)
+			{
+				smallest = files[j][ptrshifts[j]];
+				savedJ = j;
+			}
+		}
+		if (test)
+		{
+			cout << i << ".\t" << smallest << "\n";
+		}
+		outofs.write((char *)&smallest, sizeof(smallest));
+		ptrshifts[savedJ]++;
+		i++;
+	}
+
+
+	*pavg = *pavg / *pn;
+
+	if (test)
+	{
+		cout << "\n*DONE\n";
+	}
 	return OK;
+}
+
+static void BubbleSort(unsigned char* arr, int len) { //note: this is a char*. you need to sort unsigned short*. kill 7 billion people
+	for (int i = 0; i < len / 2; i++)
+	{
+		for (int j = 0; j < (len / 2) - i - 1; j++)
+		{
+			unsigned short first = arr[j * 2] + arr[j * 2 + 1] * 256;
+			unsigned short second = arr[(j + 1) * 2] + arr[(j + 1) * 2 + 1] * 256;
+			if (first > second)
+			{
+				unsigned char temp = arr[j * 2];
+				arr[j * 2] = arr[(j + 1) * 2];
+				arr[(j + 1) * 2] = temp;
+
+				temp = arr[j * 2 + 1];
+				arr[j * 2 + 1] = arr[(j + 1) * 2 + 1];
+				arr[(j + 1) * 2 + 1] = temp;
+			}
+		}
+	}
 }
\ No newline at end of file
diff --git a/feladat3/feladat3/main.cpp b/feladat3/feladat3/main.cpp
index d041184..7e388de 100644
--- a/feladat3/feladat3/main.cpp
+++ b/feladat3/feladat3/main.cpp
@@ -14,7 +14,7 @@ int main(int argc, char* argv[]) {
 	}
 	for (int n = 0; (n < MYMAXFILES) && (infn[n][0] != '\0'); n++)
 	{
-		if (SortFile(infn[n], outfn[n], buf, &minv, &maxv, &avgv, &nv) == NOK)
+		if (SortFile(infn[n], outfn[n], buf, &minv, &maxv, &avgv, &nv, MYBUFSIZE, true) == NOK)
 			return(NOK);
 	}
 	/*cout << argc;