func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, i, j, ans = 0;     cin >> n;     pair<int, int> p[n];     int ab, be, le, ri;     for (i = 0; i < n; i++) {       int r, s;       cin >> r >> s;       p[i] = make_pair(r, s);     }     for (i = 0; i < n; i++) {       ab = 0, be = 0, le = 0, ri = 0;       for (j = 0; j < n; j++) {         if (i == j) {           continue;         }         if (p[i].first == p[j].first) {           if (p[i].second < p[j].second) {             ab++;           } else {             be++;           }         }         if (p[i].second == p[j].second) {           if (p[i].first < p[j].first) {             ri++;           } else {             le++;           }         }         if (ab > 0 && be > 0 && le > 0 && ri > 0) {           ans++;           break;         }       }     }     cout << ans;     return 0;   }   