#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;
}
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