func_code_string: #include <bits/stdc++.h>   using namespace std;   class TaskB {    public:     long long dist(pair<long long, long long> f, pair<long long, long long> s) {       return (f.first - s.first) * (f.first - s.first) +              (f.second - s.second) * (f.second - s.second);     }     void solve(std::istream& cin, std::ostream& cout) {       ios_base::sync_with_stdio(0);       cin.tie(0);       cout.tie(0);       vector<pair<long long, long long> > v(3);       set<pair<long long, long long> > st;       for (long long i = 0; i < 3; i++) {         cin >> v[i].first >> v[i].second;       }       vector<pair<long long, long long> > ans;       if (1 || dist(v[1], v[2]) <= dist(v[0], v[1]) + dist(v[0], v[2])) {         ans.push_back({v[1].first + v[2].first - v[0].first,                        v[1].second + v[2].second - v[0].second});       }       if (1 || dist(v[0], v[2]) <= dist(v[2], v[1]) + dist(v[1], v[0])) {         ans.push_back({v[0].first + v[2].first - v[1].first,                        v[0].second + v[2].second - v[1].second});       }       if (1 || dist(v[1], v[0]) <= dist(v[2], v[1]) + dist(v[0], v[2])) {         ans.push_back({v[1].first + v[0].first - v[2].first,                        v[1].second + v[0].second - v[2].second});       }       cout << ans.size() << endl;       for (long long i = 0; i < ans.size(); i++)         cout << ans[i].first <<     << ans[i].second << endl;     }   };   int main() {     TaskB solver;     std::istream& in(std::cin);     std::ostream& out(std::cout);     solver.solve(in, out);     return 0;   }   