答案

#include <iostream>#include "Matrix.h"using namespace std;Matrix::Matrix(): dimension_(0),  matrix_(nullptr){}Matrix::Matrix(unsigned int dimension, unsigned int val): dimension_(dimension),  matrix_(new unsigned int* [dimension]){for (unsigned int i = 0 ; i < dimension_; ++i) {matrix_[i] = new unsigned int [dimension_];for (unsigned int j = 0; j < dimension_; ++j)matrix_[i][j] = val;}}Matrix::Matrix(unsigned int dimension, unsigned int** data): dimension_(dimension),  matrix_(new unsigned int* [dimension]){for (unsigned int i = 0 ; i < dimension_; ++i) {matrix_[i] = new unsigned int [dimension_];for (unsigned int j = 0; j < dimension_; ++j)matrix_[i][j] = data[i][j];}}Matrix::Matrix(const Matrix& other): dimension_(other.dimension_),  matrix_(new unsigned int* [other.dimension_]){for (unsigned int i = 0 ; i < dimension_; ++i) {matrix_[i] = new unsigned int [dimension_];for (unsigned int j = 0; j < dimension_; ++j)matrix_[i][j] = other.matrix_[i][j];}}Matrix::Matrix(Matrix&& other): dimension_(other.dimension_),  matrix_(other.matrix_){other.dimension_ = 0;other.matrix_ = nullptr;}Matrix::~Matrix() {if (matrix_) {for (unsigned int i = 0 ; i < dimension_; ++i)delete [] matrix_[i];delete [] matrix_;}}Matrix& Matrix::operator=(const Matrix& other) {if (this != &other) {if (matrix_ && dimension_ != other.dimension_) {/* free self first */for (unsigned int i = 0 ; i < dimension_; ++i)delete [] matrix_[i];delete [] matrix_;/* realloc memory */dimension_ = other.dimension_;matrix_ = new unsigned int* [dimension_];for (unsigned int i = 0 ; i < dimension_; ++i)matrix_[i] = new unsigned int [dimension_];}/* copy data from other */for (unsigned int i = 0 ; i < dimension_; ++i)for (unsigned int j = 0; j < dimension_; ++j)matrix_[i][j] = other.matrix_[i][j];}return *this;}Matrix& Matrix::operator=(Matrix && other) {if (this != &other) {if (matrix_) {/* free self first */for (unsigned int i = 0 ; i < dimension_; ++i)delete [] matrix_[i];delete [] matrix_;}/* streal data from other */dimension_ = other.dimension_;matrix_ = other.matrix_;other.dimension_ = 0;other.matrix_ = nullptr;}return *this;}bool Matrix::valid() const {return (dimension_ != 0);}unsigned int Matrix::operator()(unsigned int x,unsigned int y) const {return matrix_[x][y];}unsigned int& Matrix::operator()(unsigned int x, unsigned int y) {return matrix_[x][y];}Matrix::operator bool() const {for (unsigned int i = 0 ; i < dimension_; ++i)for (unsigned int j = 0; j < dimension_; ++j)if (matrix_[i][j] != 0)return true;return false;}bool Matrix::operator==(const Matrix& other) const {for (unsigned int i = 0 ; i < dimension_; ++i)for (unsigned int j = 0; j < dimension_; ++j)if (matrix_[i][j] != other.matrix_[i][j])return false;return true;}Matrix Matrix::operator+(const Matrix& other) const {Matrix temp(*this);if (dimension_ == other.dimension_) {for (unsigned int i = 0 ; i < dimension_; ++i)for (unsigned int j = 0; j < dimension_; ++j)temp.matrix_[i][j] += other.matrix_[i][j];}return temp;}Matrix Matrix::operator*(unsigned int scalar) const {for (unsigned int i = 0 ; i < dimension_; ++i)for (unsigned int j = 0; j < dimension_; ++j)matrix_[i][j] *= scalar;return *this;}Matrix Matrix::operator*(const Matrix& other) const {Matrix temp(*this);if (dimension_ == other.dimension_) {for (unsigned int i = 0 ; i < dimension_; ++i)for (unsigned int j = 0; j < dimension_; ++j) {temp.matrix_[i][j] = 0;}}return temp;}std::ostream& operator<<(std::ostream& out, const Matrix& m) {for (unsigned int i = 0; i < m.dimension_; ++i) {for (unsigned int j = 0; j < m.dimension_; ++j)cout << (j > 0 ? " ": "") << m.matrix_[i][j];cout << endl;}return out;}// Do not change these two functionsvoid Matrix::set(unsigned int dimension, unsigned int** matrix) {// DO NOT TOUCHdimension_ = dimension;matrix_ = matrix;}unsigned int** Matrix::get(unsigned int& dimension) const {// DO NOT TOUCHdimension = dimension_;return matrix_;}