func_code_string: #include <bits/stdc++.h>   #pragma hdrstop   #pragma argsused   using namespace std;   int main(int argc, char* argv[]) {     int i, j, resp, resn, resv, resl, res, n, a, b;     vector<int> x, y;     scanf( %d , &n);     for (i = 0; i < n; i++) {       scanf( %d %d , &a, &b);       x.push_back(a);       y.push_back(b);     }     res = 0;     for (i = 0; i < n; i++) {       resv = 0;       resn = 0;       resp = 0;       resl = 0;       for (j = 0; j < n; j++) {         if (i != j) {           if (x[i] == x[j] && y[i] > y[j])             resn++;           else if (x[i] == x[j] && y[i] < y[j])             resv++;           else if (x[i] > x[j] && y[i] == y[j])             resl++;           else if (x[i] < x[j] && y[i] == y[j])             resp++;         }         if (resp != 0 && resl != 0 && resv != 0 && resn != 0) {           res++;           break;         }       }     }     printf( %d , res);     return 0;   }   