vector创建2维数组

#include <iostream>
using namespace std;

#include <vector>

int main(void)
{
　　vector <vector <int>>   array(3,vector<int>(3));

//    vector<vector <int>>array(3);
//    for (int i = 0; i <3; i++)
//        array[i].resize(3);//设置数组的大小3X3 
//现在你可以和使用数组一样使用这个vector 

    for (int i = 0; i <3; i++)
        for (int j = 0; j <3; j++)
            array[i][j] = (i*j);
    //输出 
    for (int i = 0; i <3; i++)
    {
        for (int j = 0; j <3; j++)
            cout <<array[i][j] << "   ";
        cout <<endl;
    }

    cout << "-------------" << endl;
    array[0].swap(array[1]);  //数组交互

    for (int i = 0; i <3; i++)
    {
        for (int j = 0; j <3; j++)
            cout << array[i][j] << "   ";
        cout << endl;
    }
}