使用C++创建二维数组/矩阵

int matrix[3][3] = {
    {1, 2, 3},
    {4, 5, 6},
    {7, 8, 9}
};

int rows = 3;
int cols = 3;
int** matrix = new int*[rows];
for (int i = 0; i < rows; ++i) {
    matrix[i] = new int[cols];
}

for (int i = 0; i < rows; ++i) {
    delete[] matrix[i];
}
delete[] matrix;

for (int i = 0; i < rows; ++i) {
    for (int j = 0; j < cols; ++j) {
        // 安全访问 matrix[i][j]
    }
}

#include <iostream>

int main() {
    int rows = 3, cols = 3;
    int** matrix = new int*[rows];
    for (int i = 0; i < rows; ++i) {
        matrix[i] = new int[cols];
    }

    // 初始化矩阵
    int count = 1;
    for (int i = 0; i < rows; ++i) {
        for (int j = 0; j < cols; ++j) {
            matrix[i][j] = count++;
        }
    }

    // 打印矩阵
    for (int i = 0; i < rows; ++i) {
        for (int j = 0; j < cols; ++j) {
            std::cout << matrix[i][j] << " ";
        }
        std::cout << std::endl;
    }

    // 释放内存
    for (int i = 0; i < rows; ++i) {
        delete[] matrix[i];
    }
    delete[] matrix;

    return 0;
}