func_code_string: #include <bits/stdc++.h>   using namespace std;   const double PI = acos(-1.0);   const long long INF = 1e9;   const long long LINF = INF * INF;   const int MAX = 1 << 10;   void go(pair<int, int> s, pair<int, int> f, vector<pair<int, int> >& a) {     a.push_back(s);     while (s.first > f.first) {       s.first--;       a.push_back(s);     }     while (s.first < f.first) {       s.first++;       a.push_back(s);     }     while (s.second > f.second) {       s.second--;       a.push_back(s);     }     while (s.second < f.second) {       s.second++;       a.push_back(s);     }     a.push_back(f);   }   int main() {     ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);     vector<pair<int, int> > a(3);     for (int i = (0); i < (3); ++i) cin >> a[i].first >> a[i].second;     vector<pair<int, int> > ans1, ans2;     sort(a.begin(), a.end());     go(a[0], a[1], ans1);     go(a[1], a[2], ans1);     go(a[0], {a[1].first, a[2].second}, ans2);     go(a[1], {a[1].first, a[2].second}, ans2);     go(a[2], {a[1].first, a[2].second}, ans2);     sort(ans1.begin(), ans1.end());     ans1.resize(unique(ans1.begin(), ans1.end()) - ans1.begin());     sort(ans2.begin(), ans2.end());     ans2.resize(unique(ans2.begin(), ans2.end()) - ans2.begin());     vector<pair<int, int> > ans = ans1;     if ((int)((ans2).size()) < (int)((ans1).size())) ans = ans2;     sort(ans.begin(), ans.end());     ans.resize(unique(ans.begin(), ans.end()) - ans.begin());     cout << (int)((ans).size()) << endl;     for (auto i : ans) cout << i.first <<     << i.second << endl;     cerr <<  Time elapsed:   << clock() / (double)CLOCKS_PER_SEC << endl;     return 0;   }   