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diff --git a/Year 1/Object-oriented Programming/Solutions Sem. 01/exercise01.cpp b/Year 1/Object-oriented Programming/Solutions Sem. 01/exercise01.cpp
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+++ b/Year 1/Object-oriented Programming/Solutions Sem. 01/exercise01.cpp
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+#include <iostream> // cin, cout
+#include <cmath>    // sqrt
+
+struct Point {
+	double x;
+	double y;
+};
+
+double calcDistance(Point a, Point b) {
+	return sqrt((a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y));
+}
+
+Point cinPoint() {
+	Point temp;
+	std::cin >> temp.x >> temp.y;
+	return temp;
+}
+
+struct Triangle {
+	Point A;
+	Point B;
+	Point C;
+
+	double Area;
+};
+
+double calcArea(Triangle tri) {
+	double a = calcDistance(tri.B, tri.C);
+	double b = calcDistance(tri.A, tri.C);
+	double c = calcDistance(tri.A, tri.B);
+
+	double p = (a + b + c) / 2;
+	return sqrt(p*(p-a)*(p-b)*(p-c)); // Heron's formula
+}
+
+Triangle createTriangle(Point A, Point B, Point C) {
+	return { A, B, C, calcArea({A, B, C}) };
+}
+
+Triangle cinTriangle() {
+	Point tempA = cinPoint(),
+		  tempB = cinPoint(),
+		  tempC = cinPoint();
+	return createTriangle(tempA, tempB, tempC);
+}
+
+void coutTriangle(Triangle tri) {
+	std::cout << "(" << tri.Area << ")" << std::endl;
+}
+
+int cmpByArea(Triangle tri1, Triangle tri2) {
+	return (tri1.Area > tri2.Area) ? 1 : ((tri1.Area < tri2.Area) ? -1 : 0);
+}
+
+void sortTriangleArr(Triangle* triangles, int N, int (compare)(Triangle, Triangle)) {
+	int indOfSmallest = 0;
+	for (int i = 0; i < N - 1; i++, indOfSmallest = i) {
+		for (int j = i + 1; j < N; j++) {
+			if (compare(triangles[j], triangles[indOfSmallest]) < 0)
+				indOfSmallest = j;
+		}
+
+		Triangle temp = triangles[i];
+		triangles[i] = triangles[indOfSmallest];
+		triangles[indOfSmallest] = temp;
+	}
+}
+
+int main() {
+	int N;
+	std::cin >> N;
+
+	Triangle* triangles = new Triangle[N];
+	for (int i = 0; i < N; i++)
+		triangles[i] = cinTriangle();
+	
+	sortTriangleArr(triangles, N, cmpByArea);
+
+	for (int i = 0; i < N; i++)
+		coutTriangle(triangles[i]);
+
+	delete[] triangles;
+};