vector<vector<int>> 使用简单示例

#include <iostream>
#include <vector>

using namespace std;

int main()
{
    vector<vector<int>> A;
    vector<int> B;

    B.push_back(0);
    B.push_back(1);
    B.push_back(2);
    B.push_back(3);
    A.push_back(B);

    //注意需要清空B
    B.clear();
    B.push_back(4);
    B.push_back(5);
    B.push_back(6);
    B.push_back(7);
    A.push_back(B);

    cout << "============第一种索引方式============" << endl;
    for (int i = 0; i < 2; i++)
    {
        vector<int> & p = A[i];
        for (int j = 0; j < p.size(); j++)
        {
            cout << p[j] << " ";
        }
        cout << endl;
    }

    cout << "============第二种索引方式============" << endl;
    for (int i = 0; i < A.size(); i++)
    {
        for (int j = 0; j < A[0].size();j++)
            cout << A[i][j] << " ";

        cout << endl;
    }

    return  0;
}

原文地址：https://www.cnblogs.com/chay/p/10304485.html