change2d.cpp

#include<iostream>
#include<vector>
using namespace std;
// void change2d(int arr[3][3]);//compulsory in array

void change2DVector(vector< vector<int> > &v){
    v[0][0]=200;
}
int main(){
    // int arr[3][3]={{1,2,3},{4,5,6},{7,8,9}};
    // cout<<arr[0][0];
    // change2d(arr);
    vector<int> v1; // 1 2 3
    v1.push_back(1);
    v1.push_back(2);
    v1.push_back(3);
    vector<int> v2; // 4 5
    v2.push_back(4);
    v2.push_back(5);
    vector<int> v3;
    v3.push_back(6);
    v3.push_back(7);
    v3.push_back(8);
    v3.push_back(9);
    v3.push_back(10);


    vector< vector<int> >v;
    v.push_back(v1);
    v.push_back(v2);
    v.push_back(v3);

    cout<<v[0][0]<<endl;
    change2DVector(v);
    cout<<v[0][0];
    
    return 0;
}