c++创建两个二维整数矩阵， 要求输出矩阵， 并计算两个矩阵的加法、乘法结果及其计算时间。尽量简便

在C++中，你可以使用`std::vector`来创建二维整数矩阵，并利用`chrono`库来测量时间和进行矩阵运算。下面是一个简单的示例，展示了如何创建矩阵、输出矩阵、以及实现矩阵的加法和乘法：

#include <iostream>
#include <vector>
#include <chrono>

// 定义矩阵类
class Matrix {
private:
    std::vector<std::vector<int>> data;
    int rows, cols;

public:
    // 构造函数
    Matrix(int r, int c) : rows(r), cols(c) { data.resize(rows, std::vector<int>(cols, 0)); }

    // 输出矩阵
    void display() const {
        for (int i = 0; i < rows; ++i) {
            for (int j = 0; j < cols; ++j)
                std::cout << data[i][j] << " ";
            std::cout << "\n";
        }
    }

    // 加法
    Matrix operator+(const Matrix& other) {
        if (rows != other.rows || cols != other.cols) throw std::runtime_error("Matrices must have the same dimensions for addition");
        Matrix result(rows, cols);
        for (int i = 0; i < rows; ++i) {
            for (int j = 0; j < cols; ++j)
                result.data[i][j] = data[i][j] + other.data[i][j];
        }
        return result;
    }

    // 乘法（假设是元素级乘法）
    Matrix operator*(const Matrix& other) {
        if (cols != other.rows) throw std::runtime_error("Incompatible matrix dimensions for multiplication");
        Matrix result(rows, other.cols);
        auto start = std::chrono::high_resolution_clock::now();
        for (int i = 0; i < rows; ++i) {
            for (int j = 0; j < other.cols; ++j) {
                int sum = 0;
                for (int k = 0; k < cols; ++k)
                    sum += data[i][k] * other.data[k][j];
                result.data[i][j] = sum;
            }
        }
        auto end = std::chrono::high_resolution_clock::now();
        double time_spent = std::chrono::duration_cast<std::chrono::microseconds>(end - start).count() / 1e6; // 转换为毫秒
        std::cout << "Time taken for multiplication: " << time_spent << " ms\n";
        return result;
    }
};

int main() {
    int r, c;
    std::cout << "Enter number of rows and columns for each matrix: ";
    std::cin >> r >> c;

    Matrix m1(r, c), m2(r, c);

    // 获取用户输入并填充矩阵
    std::cout << "Enter elements for matrix 1:\n";
    for (auto &row : m1.data)
        for (auto &element : row)
            std::cin >> element;

    std::cout << "Enter elements for matrix 2:\n";
    for (auto &row : m2.data)
        for (auto &element : row)
            std::cin >> element;

    // 输出和运算
    std::cout << "Matrix 1:\n" << m1 << "\n";
    std::cout << "Matrix 2:\n" << m2 << "\n";

    m1.display(); // 输出第一个矩阵
    m2.display(); // 输出第二个矩阵

    Matrix sum = m1 + m2;
    std::cout << "Sum:\n" << sum << "\n";

    Matrix product = m1 * m2;
    std::cout << "Product:\n" << product << "\n";

    return 0;
}