diff --git a/labs/2/04-operator-overloading-friends-and-more/solutions/Source.cpp b/labs/2/04-operator-overloading-friends-and-more/solutions/Source.cpp
new file mode 100644
index 0000000..8534db3
--- /dev/null
+++ b/labs/2/04-operator-overloading-friends-and-more/solutions/Source.cpp
@@ -0,0 +1,20 @@
+#include <iostream>
+#include "Vector.h"
+#include "Virus.h"
+
+int main()
+{
+    Vector vec;
+
+    vec += Virus("Corona", 5);
+    vec += Virus("The flu", 3);
+    vec += Virus("Spanish flu", 6);
+    vec += Virus("Corona B", 8);
+    vec += Virus("Virus Z", 10);
+
+    std::cout << vec << std::endl;
+    vec.sort();
+    std::cout << vec << std::endl;
+
+    return 0;
+}
diff --git a/labs/2/04-operator-overloading-friends-and-more/solutions/Vector.cpp b/labs/2/04-operator-overloading-friends-and-more/solutions/Vector.cpp
new file mode 100644
index 0000000..32d6f2e
--- /dev/null
+++ b/labs/2/04-operator-overloading-friends-and-more/solutions/Vector.cpp
@@ -0,0 +1,164 @@
+#include <algorithm>
+#include "Vector.h"
+
+const int DEFAULT_CAPACITY = 4;
+
+Vector::Vector(int capacity)
+    : m_size(0)
+    , m_capacity(std::max(capacity, DEFAULT_CAPACITY))
+    , m_arr(new elem_t[m_capacity])
+{}
+
+
+Vector::Vector(const Vector& other)
+{
+    copy(other);
+}
+
+
+Vector& Vector::operator=(const Vector& other)
+{
+    if (this != &other) {
+        clear();
+        copy(other);
+    }
+    return *this;
+}
+
+
+Vector::~Vector()
+{
+    clear();
+}
+
+
+void Vector::copy(const Vector& other)
+{
+    m_size = other.m_size;
+    m_capacity = other.m_capacity;
+    m_arr = new elem_t[m_capacity];
+    for (int i = 0; i < m_size; i++)
+        m_arr[i] = other.m_arr[i];
+}
+
+
+void Vector::clear()
+{
+    delete[] m_arr;
+    m_arr = nullptr;
+}
+
+
+int Vector::size() const
+{
+    return m_size;
+}
+
+
+int Vector::capacity() const
+{
+    return m_capacity;
+}
+
+
+elem_t& Vector::at(int index)
+{
+    return m_arr[index];
+}
+
+
+const elem_t& Vector::at(int index) const
+{
+    return m_arr[index];
+}
+
+
+void Vector::push_back(const elem_t& element)
+{
+    if (m_size >= m_capacity)
+        reserve(2 * m_capacity);
+    
+    m_arr[m_size] = element;
+    ++m_size;
+}
+
+
+void Vector::erase(int index)
+{
+    --m_size;
+    for (int i = index; i < m_size; i++)
+        m_arr[i] = m_arr[i + 1];
+}
+
+
+void Vector::reserve(int capacity)
+{
+    if (capacity > m_capacity) {
+        m_capacity = capacity;
+        elem_t* new_arr = new elem_t[capacity];
+
+        for (int i = 0; i < m_size; i++)
+            new_arr[i] = m_arr[i];
+
+        delete[] m_arr;
+        m_arr = new_arr;
+    }
+}
+
+
+void Vector::sort()
+{
+    for (int i = 0; i < m_size - 1; i++) {
+        int maxIndex = i;
+
+        for (int j = i + 1; j < m_size; j++)
+            if (m_arr[j] > m_arr[maxIndex])
+                maxIndex = j;
+
+        if (maxIndex != i)
+            std::swap(m_arr[i], m_arr[maxIndex]);
+    }
+}
+
+
+elem_t& Vector::operator[](int index)
+{
+    return at(index);
+}
+
+
+const elem_t& Vector::operator[](int index) const
+{
+    return at(index);
+}
+
+
+Vector& Vector::operator+=(const elem_t& elem)
+{
+    push_back(elem);
+    return *this;
+}
+
+
+Vector& Vector::operator+=(const Vector& other)
+{
+    reserve(m_size + other.m_size);
+    for (int i = 0; i < other.m_size; i++)
+        *this += other[i];
+    return *this;
+}
+
+
+std::ostream& operator<<(std::ostream& out, const Vector& obj)
+{
+    out << "[ ";
+
+    if (obj.size() >= 1)
+        out << obj[0];
+
+    for (int i = 1; i < obj.size(); i++)
+        out << ", " << obj[i];
+
+    out << " ]";
+    return out;
+}
diff --git a/labs/2/04-operator-overloading-friends-and-more/solutions/Vector.h b/labs/2/04-operator-overloading-friends-and-more/solutions/Vector.h
new file mode 100644
index 0000000..2c8e826
--- /dev/null
+++ b/labs/2/04-operator-overloading-friends-and-more/solutions/Vector.h
@@ -0,0 +1,43 @@
+#pragma once
+#include <iostream>
+#include "Virus.h"
+
+typedef Virus elem_t;
+
+class Vector
+{
+public:
+    // Big four
+    Vector(int capacity = 0);
+    Vector(const Vector& other);
+    Vector& operator=(const Vector& other);
+    ~Vector();
+
+    // Methods
+    int size() const;
+    int capacity() const;
+    elem_t& at(int index);
+    const elem_t& at(int index) const;
+    void push_back(const elem_t& element);
+    void erase(int index);
+    void reserve(int capacity);
+    void sort();
+
+    // Operators
+    elem_t& operator[](int index);
+    const elem_t& operator[](int index) const;
+    Vector& operator+=(const elem_t& elem);
+    Vector& operator+=(const Vector& other);
+
+private:
+    // Helper methods used in the big four
+    void copy(const Vector& other);
+    void clear();
+
+    // Data members
+    int m_size;
+    int m_capacity;
+    elem_t* m_arr;
+};
+
+std::ostream& operator<<(std::ostream& out, const Vector& obj);
diff --git a/labs/2/04-operator-overloading-friends-and-more/solutions/Virus.cpp b/labs/2/04-operator-overloading-friends-and-more/solutions/Virus.cpp
new file mode 100644
index 0000000..b7bfd8a
--- /dev/null
+++ b/labs/2/04-operator-overloading-friends-and-more/solutions/Virus.cpp
@@ -0,0 +1,91 @@
+#include <cstring>
+#include "Virus.h"
+
+Virus::Virus(const char* name, double severity)
+    : severity(severity)
+    , name(new char[strlen(name) + 1])
+{
+    strcpy(this->name, name);
+}
+
+
+Virus::Virus(const Virus& other)
+{
+    copy(other);
+}
+
+
+Virus& Virus::operator=(const Virus& other)
+{
+    if (this != &other) {
+        clear();
+        copy(other);
+    }
+    return *this;
+}
+
+
+Virus::~Virus()
+{
+    clear();
+}
+
+
+void Virus::copy(const Virus& other)
+{
+    severity = other.severity;
+    name = new char[strlen(other.name) + 1];
+    strcpy(name, other.name);
+}
+
+
+void Virus::clear()
+{
+    delete[] name;
+}
+
+
+bool Virus::operator<(const Virus& other) const
+{
+    return severity < other.severity;
+}
+
+
+bool Virus::operator>=(const Virus& other) const
+{
+    return !(*this < other);
+}
+
+
+bool Virus::operator>(const Virus& other) const
+{
+    return severity > other.severity;
+}
+
+
+bool Virus::operator<=(const Virus& other) const
+{
+    return !(*this > other);
+}
+
+
+std::ostream& operator<<(std::ostream& out, const Virus& obj)
+{
+    return out << obj.getName() << " (" << obj.getSeverity() << ")";
+}
+
+
+void Virus::setName(const char* newName)
+{
+    if (newName != nullptr) {
+        delete[] name;
+        name = new char[strlen(newName) + 1];
+        strcpy(name, newName);
+    }
+}
+
+
+void Virus::setSeverity(double newSeverity)
+{
+    severity = newSeverity;
+}
diff --git a/labs/2/04-operator-overloading-friends-and-more/solutions/Virus.h b/labs/2/04-operator-overloading-friends-and-more/solutions/Virus.h
new file mode 100644
index 0000000..df99d4b
--- /dev/null
+++ b/labs/2/04-operator-overloading-friends-and-more/solutions/Virus.h
@@ -0,0 +1,31 @@
+#pragma once
+#include <iostream>
+
+class Virus
+{
+public:
+    Virus(const char* name = "", double severity = 0);
+    Virus(const Virus& other);
+    Virus& operator=(const Virus& other);
+    ~Virus();
+
+    bool operator<(const Virus& other) const;
+    bool operator>=(const Virus& other) const;
+    bool operator>(const Virus& other) const;
+    bool operator<=(const Virus& other) const;
+
+    const char* getName() const { return name; }
+    void setName(const char* newName);
+    double getSeverity() const { return severity; }
+    void setSeverity(double newSeverity);
+
+private:
+
+    void copy(const Virus& other);
+    void clear();
+
+    double severity;
+    char* name;
+};
+
+std::ostream& operator<<(std::ostream& out, const Virus& obj);