在C++中动态分配2D数组的警告

#include <vector>

int main() {
    int rows = 3;
    int cols = 4;
    std::vector<std::vector<int>> matrix(rows, std::vector<int>(cols));

    // 对matrix进行操作

    return 0;
}

int main() {
    int rows = 3;
    int cols = 4;

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

    // 对matrix进行操作

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

    return 0;
}

int main() {
    int rows = 3;
    int cols = 4;

    int* matrix = new int[rows * cols];

    // 对matrix进行操作

    // 释放内存
    delete[] matrix;

    return 0;
}