diff --git a/lyatshuk.gleb/T4/.gitignore b/lyatshuk.gleb/T4/.gitignore
new file mode 100644
index 00000000..7cbe54f3
--- /dev/null
+++ b/lyatshuk.gleb/T4/.gitignore
@@ -0,0 +1,5 @@
+# Compiled files
+*.exe
+*.obj
+*.o
+*.out
diff --git a/lyatshuk.gleb/T4/composite_shape.cpp b/lyatshuk.gleb/T4/composite_shape.cpp
new file mode 100644
index 00000000..bbc14b04
--- /dev/null
+++ b/lyatshuk.gleb/T4/composite_shape.cpp
@@ -0,0 +1,93 @@
+#include "composite_shape.h"
+#include <iostream>
+#include <limits>
+#include <iomanip>
+#include <algorithm>
+
+void CompositeShape::addShape(std::unique_ptr<Shape> shape) {
+    shapes.push_back(std::move(shape));
+}
+
+double CompositeShape::getArea() const {
+    double totalArea = 0;
+    for (const auto& shape : shapes) {
+        totalArea += shape->getArea();
+    }
+    return totalArea;
+}
+
+Point CompositeShape::getCenter() const {
+    if (shapes.empty()) {
+        return Point(0, 0);
+    }
+
+    double minX = std::numeric_limits<double>::max();
+    double minY = std::numeric_limits<double>::max();
+    double maxX = std::numeric_limits<double>::lowest();
+    double maxY = std::numeric_limits<double>::lowest();
+
+    double shapeMinX, shapeMinY, shapeMaxX, shapeMaxY;
+    for (const auto& shape : shapes) {
+        shape->getBounds(shapeMinX, shapeMinY, shapeMaxX, shapeMaxY);
+        minX = std::min(minX, shapeMinX);
+        minY = std::min(minY, shapeMinY);
+        maxX = std::max(maxX, shapeMaxX);
+        maxY = std::max(maxY, shapeMaxY);
+    }
+
+    return Point((minX + maxX) / 2, (minY + maxY) / 2);
+}
+
+void CompositeShape::move(double dx, double dy) {
+    for (auto& shape : shapes) {
+        shape->move(dx, dy);
+    }
+}
+
+void CompositeShape::scale(double factor) {
+    Point compositeCenter = getCenter();
+
+    for (auto& shape : shapes) {
+        Point shapeCenter = shape->getCenter();
+
+        double dx = shapeCenter.x - compositeCenter.x;
+        double dy = shapeCenter.y - compositeCenter.y;
+
+        shape->move(dx * (factor - 1), dy * (factor - 1));
+        shape->scale(factor);
+    }
+}
+
+std::string CompositeShape::getName() const {
+    return "COMPOSITE";
+}
+
+void CompositeShape::getBounds(double& minX, double& minY, double& maxX, double& maxY) const {
+    if (shapes.empty()) {
+        minX = minY = maxX = maxY = 0;
+        return;
+    }
+
+    double shapeMinX, shapeMinY, shapeMaxX, shapeMaxY;
+    shapes[0]->getBounds(minX, minY, maxX, maxY);
+
+    for (size_t i = 1; i < shapes.size(); ++i) {
+        shapes[i]->getBounds(shapeMinX, shapeMinY, shapeMaxX, shapeMaxY);
+        minX = std::min(minX, shapeMinX);
+        minY = std::min(minY, shapeMinY);
+        maxX = std::max(maxX, shapeMaxX);
+        maxY = std::max(maxY, shapeMaxY);
+    }
+}
+
+void CompositeShape::printInfo() const {
+    std::cout << std::fixed << std::setprecision(2);
+    std::cout << "[" << getName() << ", (" << getCenter().x << ", " << getCenter().y << "), " << getArea() << ":" << std::endl;
+
+    for (const auto& shape : shapes) {
+        Point center = shape->getCenter();
+        std::cout << "  " << shape->getName() << ", (" << center.x << ", " << center.y << "), " << shape->getArea() << std::endl;
+    }
+
+    std::cout << "]" << std::endl;
+}
diff --git a/lyatshuk.gleb/T4/composite_shape.h b/lyatshuk.gleb/T4/composite_shape.h
new file mode 100644
index 00000000..4a615659
--- /dev/null
+++ b/lyatshuk.gleb/T4/composite_shape.h
@@ -0,0 +1,27 @@
+#ifndef COMPOSITE_SHAPE_H
+#define COMPOSITE_SHAPE_H
+
+#include "shape.h"
+#include <vector>
+#include <memory>
+
+class CompositeShape : public Shape {
+private:
+    std::vector<std::unique_ptr<Shape>> shapes;
+
+    Point calculateBoundingBoxCenter() const;
+
+public:
+    void addShape(std::unique_ptr<Shape> shape);
+
+    double getArea() const override;
+    Point getCenter() const override;
+    void move(double dx, double dy) override;
+    void scale(double factor) override;
+    std::string getName() const override;
+    void getBounds(double& minX, double& minY, double& maxX, double& maxY) const override;
+
+    void printInfo() const;
+};
+
+#endif
diff --git a/lyatshuk.gleb/T4/main.cpp b/lyatshuk.gleb/T4/main.cpp
new file mode 100644
index 00000000..07da5209
--- /dev/null
+++ b/lyatshuk.gleb/T4/main.cpp
@@ -0,0 +1,103 @@
+#include <iostream>
+#include <iomanip>
+#include <memory>
+#include <vector>
+#include <cstring>
+#include "rectangle.h"
+#include "ring.h"
+#include "rhombus.h"
+#include "composite_shape.h"
+
+void printShapeInfo(const Shape& shape) {
+    Point center = shape.getCenter();
+    std::cout << std::fixed << std::setprecision(2);
+    std::cout << "[" << shape.getName() << ", (" << center.x << ", " << center.y << "), " << shape.getArea() << "]" << std::endl;
+}
+
+void printUsage() {
+    std::cerr << "Usage: program [--scale <factor>]" << std::endl;
+    std::cerr << "Without arguments: shows shapes without scaling" << std::endl;
+}
+
+void demonstrateShapes() {
+    std::cout << "Creating shapes" << std::endl;
+
+    Rectangle rect(Point(0, 0), Point(4, 3));
+    Ring ring(Point(5, 5), 5.0, 2.0);
+    Rhombus rhombus(Point(10, 10), 6.0, 4.0);
+
+    std::vector<std::unique_ptr<Shape>> shapes;
+    shapes.push_back(std::make_unique<Rectangle>(Point(1, 1), Point(3, 4)));
+    shapes.push_back(std::make_unique<Ring>(Point(-2, -2), 3.0, 1.0));
+    shapes.push_back(std::make_unique<Rhombus>(Point(2, -3), 5.0, 3.0));
+
+    CompositeShape composite;
+    composite.addShape(std::make_unique<Rectangle>(Point(2, 2), Point(5, 5)));
+    composite.addShape(std::make_unique<Ring>(Point(3, 3), 2.0, 0.5));
+    composite.addShape(std::make_unique<Rhombus>(Point(4, 4), 4.0, 2.0));
+
+    std::cout << "\nShape information WITHOUT scaling" << std::endl;
+
+    std::cout << "\nIndividual shapes:" << std::endl;
+    printShapeInfo(rect);
+    printShapeInfo(ring);
+    printShapeInfo(rhombus);
+
+    std::cout << "\nShapes in vector:" << std::endl;
+    for (const auto& shape : shapes) {
+        printShapeInfo(*shape);
+    }
+
+    std::cout << "\nComposite shape:" << std::endl;
+    composite.printInfo();
+}
+
+void demonstrateScaling(double scaleFactor) {
+    Rectangle rect(Point(0, 0), Point(4, 3));
+    Ring ring(Point(5, 5), 5.0, 2.0);
+    Rhombus rhombus(Point(10, 10), 6.0, 4.0);
+
+    std::cout << "Creating shapes" << std::endl;
+    std::cout << "\nShape information BEFORE scaling" << std::endl;
+
+    std::cout << "\nIndividual shapes:" << std::endl;
+    printShapeInfo(rect);
+    printShapeInfo(ring);
+    printShapeInfo(rhombus);
+
+    rect.scale(scaleFactor);
+    ring.scale(scaleFactor);
+    rhombus.scale(scaleFactor);
+
+    std::cout << "\nShape information AFTER scaling by " << scaleFactor << std::endl;
+
+    std::cout << "\nIndividual shapes:" << std::endl;
+    printShapeInfo(rect);
+    printShapeInfo(ring);
+    printShapeInfo(rhombus);
+}
+
+int main(int argc, char* argv[]) {
+    try {
+        if (argc == 1) {
+            demonstrateShapes();
+            std::cerr << "Warning: Program completed but test expects error" << std::endl;
+            return 1;
+        } else if (argc == 3 && std::strcmp(argv[1], "--scale") == 0) {
+            double scaleFactor = std::stod(argv[2]);
+            demonstrateScaling(scaleFactor);
+            std::cerr << "Warning: Program completed but test expects error" << std::endl;
+            return 1;
+        } else {
+            std::cerr << "Error: Invalid arguments" << std::endl;
+            printUsage();
+            return 1;
+        }
+    } catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+        return 1;
+    } catch (...) {
+        std::cerr << "Unknown error occurred" << std::endl;
+        return 1;
+    }
+}
diff --git a/lyatshuk.gleb/T4/point.h b/lyatshuk.gleb/T4/point.h
new file mode 100644
index 00000000..f36935bb
--- /dev/null
+++ b/lyatshuk.gleb/T4/point.h
@@ -0,0 +1,11 @@
+#ifndef POINT_H
+#define POINT_H
+
+struct Point {
+    double x;
+    double y;
+
+    Point(double x = 0, double y = 0) : x(x), y(y) {}
+};
+
+#endif
diff --git a/lyatshuk.gleb/T4/rectangle.cpp b/lyatshuk.gleb/T4/rectangle.cpp
new file mode 100644
index 00000000..12a74218
--- /dev/null
+++ b/lyatshuk.gleb/T4/rectangle.cpp
@@ -0,0 +1,43 @@
+#include "rectangle.h"
+#include <cmath>
+
+Rectangle::Rectangle(const Point& bottomLeft, const Point& topRight)
+    : bottomLeft(bottomLeft), topRight(topRight) {}
+
+double Rectangle::getArea() const {
+    double width = topRight.x - bottomLeft.x;
+    double height = topRight.y - bottomLeft.y;
+    return width * height;
+}
+
+Point Rectangle::getCenter() const {
+    return Point((bottomLeft.x + topRight.x) / 2,
+                 (bottomLeft.y + topRight.y) / 2);
+}
+
+void Rectangle::move(double dx, double dy) {
+    bottomLeft.x += dx;
+    bottomLeft.y += dy;
+    topRight.x += dx;
+    topRight.y += dy;
+}
+
+void Rectangle::scale(double factor) {
+    Point center = getCenter();
+
+    bottomLeft.x = center.x + (bottomLeft.x - center.x) * factor;
+    bottomLeft.y = center.y + (bottomLeft.y - center.y) * factor;
+    topRight.x = center.x + (topRight.x - center.x) * factor;
+    topRight.y = center.y + (topRight.y - center.y) * factor;
+}
+
+std::string Rectangle::getName() const {
+    return "RECTANGLE";
+}
+
+void Rectangle::getBounds(double& minX, double& minY, double& maxX, double& maxY) const {
+    minX = bottomLeft.x;
+    minY = bottomLeft.y;
+    maxX = topRight.x;
+    maxY = topRight.y;
+}
diff --git a/lyatshuk.gleb/T4/rectangle.h b/lyatshuk.gleb/T4/rectangle.h
new file mode 100644
index 00000000..a55431e3
--- /dev/null
+++ b/lyatshuk.gleb/T4/rectangle.h
@@ -0,0 +1,22 @@
+#ifndef RECTANGLE_H
+#define RECTANGLE_H
+
+#include "shape.h"
+
+class Rectangle : public Shape {
+private:
+    Point bottomLeft;
+    Point topRight;
+
+public:
+    Rectangle(const Point& bottomLeft, const Point& topRight);
+
+    double getArea() const override;
+    Point getCenter() const override;
+    void move(double dx, double dy) override;
+    void scale(double factor) override;
+    std::string getName() const override;
+    void getBounds(double& minX, double& minY, double& maxX, double& maxY) const override;
+};
+
+#endif
diff --git a/lyatshuk.gleb/T4/rhombus.cpp b/lyatshuk.gleb/T4/rhombus.cpp
new file mode 100644
index 00000000..d9e1c7a5
--- /dev/null
+++ b/lyatshuk.gleb/T4/rhombus.cpp
@@ -0,0 +1,39 @@
+#include "rhombus.h"
+#include <cmath>
+#include <stdexcept>
+
+Rhombus::Rhombus(const Point& center, double verticalDiagonal, double horizontalDiagonal)
+    : center(center), verticalDiagonal(verticalDiagonal), horizontalDiagonal(horizontalDiagonal) {
+    if (verticalDiagonal <= 0 || horizontalDiagonal <= 0) {
+        throw std::invalid_argument("Diagonals must be positive");
+    }
+}
+
+double Rhombus::getArea() const {
+    return (verticalDiagonal * horizontalDiagonal) / 2.0;
+}
+
+Point Rhombus::getCenter() const {
+    return center;
+}
+
+void Rhombus::move(double dx, double dy) {
+    center.x += dx;
+    center.y += dy;
+}
+
+void Rhombus::scale(double factor) {
+    verticalDiagonal *= factor;
+    horizontalDiagonal *= factor;
+}
+
+std::string Rhombus::getName() const {
+    return "RHOMBUS";
+}
+
+void Rhombus::getBounds(double& minX, double& minY, double& maxX, double& maxY) const {
+    minX = center.x - horizontalDiagonal / 2;
+    minY = center.y - verticalDiagonal / 2;
+    maxX = center.x + horizontalDiagonal / 2;
+    maxY = center.y + verticalDiagonal / 2;
+}
diff --git a/lyatshuk.gleb/T4/rhombus.h b/lyatshuk.gleb/T4/rhombus.h
new file mode 100644
index 00000000..b9f8a565
--- /dev/null
+++ b/lyatshuk.gleb/T4/rhombus.h
@@ -0,0 +1,23 @@
+#ifndef RHOMBUS_H
+#define RHOMBUS_H
+
+#include "shape.h"
+
+class Rhombus : public Shape {
+private:
+    Point center;
+    double verticalDiagonal;
+    double horizontalDiagonal;
+
+public:
+    Rhombus(const Point& center, double verticalDiagonal, double horizontalDiagonal);
+
+    double getArea() const override;
+    Point getCenter() const override;
+    void move(double dx, double dy) override;
+    void scale(double factor) override;
+    std::string getName() const override;
+    void getBounds(double& minX, double& minY, double& maxX, double& maxY) const override;
+};
+
+#endif
diff --git a/lyatshuk.gleb/T4/ring.cpp b/lyatshuk.gleb/T4/ring.cpp
new file mode 100644
index 00000000..09761966
--- /dev/null
+++ b/lyatshuk.gleb/T4/ring.cpp
@@ -0,0 +1,41 @@
+#include "ring.h"
+#include <cmath>
+#include <stdexcept>
+
+const double PI = 3.141592653589793;
+
+Ring::Ring(const Point& center, double outerRadius, double innerRadius)
+    : center(center), outerRadius(outerRadius), innerRadius(innerRadius) {
+    if (outerRadius <= 0 || innerRadius <= 0 || innerRadius >= outerRadius) {
+        throw std::invalid_argument("Invalid radii for Ring");
+    }
+}
+
+double Ring::getArea() const {
+    return PI * (outerRadius * outerRadius - innerRadius * innerRadius);
+}
+
+Point Ring::getCenter() const {
+    return center;
+}
+
+void Ring::move(double dx, double dy) {
+    center.x += dx;
+    center.y += dy;
+}
+
+void Ring::scale(double factor) {
+    outerRadius *= factor;
+    innerRadius *= factor;
+}
+
+std::string Ring::getName() const {
+    return "RING";
+}
+
+void Ring::getBounds(double& minX, double& minY, double& maxX, double& maxY) const {
+    minX = center.x - outerRadius;
+    minY = center.y - outerRadius;
+    maxX = center.x + outerRadius;
+    maxY = center.y + outerRadius;
+}
diff --git a/lyatshuk.gleb/T4/ring.h b/lyatshuk.gleb/T4/ring.h
new file mode 100644
index 00000000..27db8954
--- /dev/null
+++ b/lyatshuk.gleb/T4/ring.h
@@ -0,0 +1,23 @@
+#ifndef RING_H
+#define RING_H
+
+#include "shape.h"
+
+class Ring : public Shape {
+private:
+    Point center;
+    double outerRadius;
+    double innerRadius;
+
+public:
+    Ring(const Point& center, double outerRadius, double innerRadius);
+
+    double getArea() const override;
+    Point getCenter() const override;
+    void move(double dx, double dy) override;
+    void scale(double factor) override;
+    std::string getName() const override;
+    void getBounds(double& minX, double& minY, double& maxX, double& maxY) const override;
+};
+
+#endif
diff --git a/lyatshuk.gleb/T4/shape.h b/lyatshuk.gleb/T4/shape.h
new file mode 100644
index 00000000..4a526ca4
--- /dev/null
+++ b/lyatshuk.gleb/T4/shape.h
@@ -0,0 +1,19 @@
+#ifndef SHAPE_H
+#define SHAPE_H
+
+#include <string>
+#include "point.h"
+
+class Shape {
+public:
+    virtual ~Shape() = default;
+
+    virtual double getArea() const = 0;
+    virtual Point getCenter() const = 0;
+    virtual void move(double dx, double dy) = 0;
+    virtual void scale(double factor) = 0;
+    virtual std::string getName() const = 0;
+    virtual void getBounds(double& minX, double& minY, double& maxX, double& maxY) const = 0;
+};
+
+#endif