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- #include<bits\stdc++.h>
- #define mx 10002
- using namespace std;
- struct data
- {
- int x,y;
- } ar[200];
- int main()
- {
- int i,j,n,cnt=0;
- cin>>n;
- for(i=0; i<n; i++)
- {
- cin>>ar[i].x>>ar[i].y;
- }
- for(i=0; i<n; i++)
- {
- int l=0;
- int r=0;
- int u=0;
- int d=0;
- for(j=0; j<n; j++)
- {
- if(ar[j].x>ar[i].x&&ar[j].y==ar[i].y)
- {
- r=1;
- }
- if(ar[j].x<ar[i].x&&ar[j].y==ar[i].y)
- {
- l=1;
- }
- if(ar[j].x==ar[i].x&&ar[j].y<ar[i].y)
- {
- d=1;
- }
- if(ar[j].x==ar[i].x&&ar[j].y>ar[i].y)
- {
- u=1;
- }
- }
- if(l==1&&r==1&&u==1&&d==1)
- {
- cnt++;
- }
- }
- cout<<cnt<<endl;
- return 0;
- }
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