YandexYellowWhiteCPlusPlus/Matr.cpp at master · raydent/YandexYellowWhiteCPlusPlus · GitHub

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#include <iostream>
#include <fstream>
#include <stdexcept>
#include <vector>

using namespace std;

class Matrix {
private:
	int num_rows_;
	int num_columns_;

	vector<vector<int>> elements_;

public:
	Matrix() {
		num_rows_ = 0;
		num_columns_ = 0;
	}

	Matrix(int num_rows, int num_columns) {
		Reset(num_rows, num_columns);
	}

	void Reset(int num_rows, int num_columns) {
		if (num_rows < 0) {
			throw out_of_range("num_rows must be >= 0");
		}
		if (num_columns < 0) {
			throw out_of_range("num_columns must be >= 0");
		}
		if (num_rows == 0 || num_columns == 0) {
			num_rows = num_columns = 0;
		}

		num_rows_ = num_rows;
		num_columns_ = num_columns;
		elements_.assign(num_rows, vector<int>(num_columns));
	}

	int& At(int row, int column) {
		return elements_.at(row).at(column);
	}

	int At(int row, int column) const {
		return elements_.at(row).at(column);
	}

	int GetNumRows() const {
		return num_rows_;
	}

	int GetNumColumns() const {
		return num_columns_;
	}
};

bool operator==(const Matrix& one, const Matrix& two) {
	if (one.GetNumRows() != two.GetNumRows()) {
		return false;
	}

	if (one.GetNumColumns() != two.GetNumColumns()) {
		return false;
	}

	for (int row = 0; row < one.GetNumRows(); ++row) {
		for (int column = 0; column < one.GetNumColumns(); ++column) {
			if (one.At(row, column) != two.At(row, column)) {
				return false;
			}
		}
	}

	return true;
}

Matrix operator+(const Matrix& one, const Matrix& two) {
	if (one.GetNumRows() != two.GetNumRows()) {
		throw invalid_argument("Mismatched number of rows");
	}

	if (one.GetNumColumns() != two.GetNumColumns()) {
		throw invalid_argument("Mismatched number of columns");
	}

	Matrix result(one.GetNumRows(), one.GetNumColumns());
	for (int row = 0; row < result.GetNumRows(); ++row) {
		for (int column = 0; column < result.GetNumColumns(); ++column) {
			result.At(row, column) = one.At(row, column) + two.At(row, column);
		}
	}

	return result;
}

istream& operator>>(istream& in, Matrix& matrix) {
	int num_rows, num_columns;
	in >> num_rows >> num_columns;

	matrix.Reset(num_rows, num_columns);
	for (int row = 0; row < num_rows; ++row) {
		for (int column = 0; column < num_columns; ++column) {
			in >> matrix.At(row, column);
		}
	}

	return in;
}

ostream& operator<<(ostream& out, const Matrix& matrix) {
	out << matrix.GetNumRows() << " " << matrix.GetNumColumns() << endl;
	for (int row = 0; row < matrix.GetNumRows(); ++row) {
		for (int column = 0; column < matrix.GetNumColumns(); ++column) {
			if (column > 0) {
				out << " ";
			}
			out << matrix.At(row, column);
		}
		out << endl;
	}

	return out;
}

int main() {
	Matrix one;
	Matrix two;

	cin >> one >> two;
	cout << one + two << endl;
	return 0;
}