#include<iostream>
#include<ctime>
#include<cstdlib>
using namespace std;
int main()
{
cout << "1.动态分配和释放一维数组" << endl;
int n;
cout << "请输入一维数组的大小n=";
cin >> n;
int* point = new int[n];
cout << "已分配大小为" << n << "的一维数组！" << endl;
delete []point;
cout << "已释放该一维数组！" << endl << endl;
cout << "2.对不同情况下的二维数组进行动态内存分配和释放" << endl;
srand((unsigned)time(0));
cout << "2.1 行数已知为 3 的二维数组" << endl;
int *a1[3],b1[3];
cout << "请依次输入该二维数组的列数"<<endl;
for (int i = 0; i < 3; i++)
{
cin >> b1[i];
