C++容器嵌套实现动态二维数组（Vector2D）

转： http://blog.csdn.net/Touch_Dream/article/details/74931891

#include<stdio.h>

#include <iostream>

#include <vector>

using namespace std;

int main()

{

    int row, column;

    cin >> row >> column;

    vector<vector<int> > a(row,    vector<int>(column));

    //row决定最里面层容器大小，vector<int>(column)决定外层容器的类型和大小

    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] << "     ";

        }

    }

    while (1)

    {

    }

    return 0;

}

方法二

利用vector的成员函数resize，来制定大小

#include<stdio.h>

#include <iostream>

#include <vector>

using namespace std;

int main()

{

    int row, column;

    cin >> row ;

    vector<vector<int> > a(row);//row决定最里面层容器大小，vector<int>(column)决定外层容器的类型和大小

    for (int k = 0; k < row; k++)

        a[k].resize(row);//row*row矩阵

    //使用空间

    for (int j = 0; j < row; j++)

        for (int k = 0; k< row; k++)

            a[j][k] = rand() % 100;

    for (int j = 0; j < row; j++)

    {

        cout << endl;

        for (int k = 0; k< row; k++)

        {

            a[j][k] = rand() % 100;

            cout << a[j][k] << "     ";

        }

    }

    while (1)

    {

    }

    return 0;

}

测试结果