func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t, i, j, count = 0;     cin >> t;     int a[t], b[t];     for (i = 0; i < t; i++) cin >> a[i] >> b[i];     for (int i = 0; i < t; i++) {       int e = 0, f = 0, c = 0, d = 0;       for (j = 0; j < t; j++) {         if (a[i] < a[j] && b[i] == b[j]) e = 1;         if (a[i] > a[j] && b[i] == b[j]) f = 1;         if (a[i] == a[j] && b[i] > b[j]) c = 1;         if (a[i] == a[j] && b[i] < b[j]) d = 1;       }       if (e + f + c + d == 4) count++;     }     cout << count <<   n ;     return 0;   }   