#define _USE_MATH_DEFINES #include //string stream its useful! #include #include #include //pair #include // vector #include // swap,sort,binary_search #include // std::greater #include //map #include //set #include //queue #include //list #include #include #include #include //cout< pa; pa *zahyo; pa mydiff( pa p1, pa p2){ return make_pair(p2.first - p1.first , p2.second - p1.second); } int main(){ omajinai(); int n; cin>>n; zahyo = new pair[n]; for_each(zahyo,zahyo+n,[](pair &p){cin>>p.first>>p.second;}); sort(zahyo,zahyo+n); pair diff = mydiff(zahyo[0],zahyo[n-1]); if(diff.first == 0 ){cout<<"YES"< p2.second;}); diff = mydiff(zahyo[0],zahyo[n-1]); if(diff.second ==0 ){cout<<"YES"<