如何取消引用多维向量指针？

int **vector = new int*[rows];
if (vector != nullptr) {
    // 安全地使用vector
}

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

#include <iostream>

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

    // 分配内存
    int **vector = new int*[rows];
    for (int i = 0; i < rows; ++i) {
        vector[i] = new int[cols];
    }

    // 使用vector
    for (int i = 0; i < rows; ++i) {
        for (int j = 0; j < cols; ++j) {
            vector[i][j] = i * cols + j;
        }
    }

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

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

    return 0;
}