读取2D阵列行为问题？

#include <iostream>
using namespace std;

int main() {
    // 静态二维数组
    int arr[3][4] = {
        {1, 2, 3, 4},
        {5, 6, 7, 8},
        {9, 10, 11, 12}
    };

    // 动态二维数组
    int rows = 3, cols = 4;
    int** dynamicArr = new int*[rows];
    for (int i = 0; i < rows; ++i) {
        dynamicArr[i] = new int[cols];
    }

    // 初始化动态数组
    int count = 1;
    for (int i = 0; i < rows; ++i) {
        for (int j = 0; j < cols; ++j) {
            dynamicArr[i][j] = count++;
        }
    }

    // 打印静态数组
    cout << "Static Array:" << endl;
    for (int i = 0; i < 3; ++i) {
        for (int j = 0; j < 4; ++j) {
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }

    // 打印动态数组
    cout << "Dynamic Array:" << endl;
    for (int i = 0; i < rows; ++i) {
        for (int j = 0; j < cols; ++j) {
            cout << dynamicArr[i][j] << " ";
        }
        cout << endl;
    }

    // 释放动态数组内存
    for (int i = 0; i < rows; ++i) {
        delete[] dynamicArr[i];
    }
    delete[] dynamicArr;

    return 0;
}

if (i >= 0 && i < rows && j >= 0 && j < cols) {
    // 安全访问 arr[i][j]
}

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