#include <iostream>
#include <vector>
using namespace std;


int main()
{
    vector<vector<pair<int, int>>> vv;
    cout <<vv.size() << endl;
    auto it = vv.insert(vv.end(), {});
    cout <<vv.size() << endl;
    //cout << it->size() << endl;
    cout << (it == vv.end())<< endl;
    
    return 0;
}