C++建立动态二维数组

https://blog.csdn.net/longshengguoji/article/details/11131365

指针构造二维数组

构造：

int array(int m, int n)
{
    if (m <= 0 || n <= 0)
    {
        return 0;
    }

    int** dp = new int*[m];
    for (int i = 0; i < m; i++)
    {
        dp[i] = new int[n];
    }

    for (int i = 0; i < m; i++)
    {
        for (int j = 0; j < n; j++)
        {
            dp[i][j] = i + 3*j;
            cout << dp[i][j]<<"	";
        }
        cout << "
" << endl;
    }
}

析构：

//析构
    for (int i = 0; i < m; i++)
    {
        delete dp[i];
        dp[i] = nullptr;
    }

二维vector

int _tmain(int argc, _TCHAR* argv[])
{
    int row,column;
    cin>>row>>column;
 //申请空间
    vector<vector<int> > a(row,vector<int>(column));
    
 
    //使用空间
    for(int j = 0;j < row;j++)
        for(int k = 0;k< column;k++)
            a[j][k] = rand()%100;
    for(int j = 0;j < row;j++)
    {
        cout<<endl;
        for(int k = 0;k< column;k++)
        {
            a[j][k] = rand()%100;
            cout<<a[j][k]<<"     ";
        }
    }        
    
    return 0;