feat(Week10): Add solutions

1 files changed, 62 insertions, 0 deletions

diff --git a/Week10/Exercise04.cpp b/Week10/Exercise04.cpp
new file mode 100644
index 0000000..5190bb4
--- /dev/null
+++ b/Week10/Exercise04.cpp
@@ -0,0 +1,62 @@
+#include <iostream>
+
+double** inputMatrix(unsigned int& rows, unsigned int& cols) {
+	std::cin >> rows >> cols;
+
+	double** mat = new double*[rows];
+	for (unsigned int row = 0; row < rows; row++) {
+		mat[row] = new double[cols];
+
+		for (unsigned int col = 0; col < cols; col++)
+			std::cin >> mat[row][col];
+	}
+
+	/* Използваме динамична памет, тя не се унищожава (освобождава)
+	 * автоматично, което означава че можем да върнем указателя и
+	 * всичко ще работи коректно.
+	 */
+	return mat;
+}
+
+void deleteMatrix(double** mat, unsigned int rows) {
+	for (unsigned int row = 0; row < rows; row++)
+		delete[] mat[row];
+	delete[] mat;
+}
+
+int main() {
+	unsigned int rowsA, colsA, rowsB, colsB;
+	double** matA = inputMatrix(rowsA, colsA), **matB = inputMatrix(rowsB, colsB);
+
+	if (colsA != rowsB) {
+		std::cout << "Cannot multiply!" << std::endl;
+	}
+	else {
+		double** matC = new double*[rowsA];
+
+		for (unsigned int row = 0; row < rowsA; row++) {
+			matC[row] = new double[colsB];
+
+			for (unsigned int col = 0; col < colsB; col++) {
+				matC[row][col] = 0;
+
+				for (unsigned int i = 0; i < colsA; i++) {
+					matC[row][col] += matA[row][i] * matB[i][col];
+				}
+			}
+		}
+
+		for (unsigned int row = 0; row < rowsA; row++) {
+			for (unsigned int col = 0; col < colsB; col++)
+				std::cout << matC[row][col] << ' ';
+			std::cout << std::endl;
+		}
+
+		deleteMatrix(matC, rowsA);
+	}
+
+	deleteMatrix(matA, rowsA);
+	deleteMatrix(matB, rowsB);
+
+	return 0;
+}