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