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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int x[10000],y[10000],n,i,j,k,l=0,a,c,b,d;
- cin>>n;
- for(i=0;i<n;i++)
- {
- cin>>x[i]>>y[i];
- }
- for(i=0;i<n;i++)
- {
- a=0,b=0,c=0,d=0;
- for(j=0;j<n;j++)
- {
- if(x[i]>x[j] && y[i]==y[j]) a=1;
- if(x[i]<x[j] && y[i]==y[j]) b=1;
- if(x[i]==x[j] && y[i]>y[j]) c=1;
- if(x[i]==x[j] && y[i]<y[j]) d=1;
- }
- if(a&&b&&c&&d) l++;
- }
- cout<<l<<endl;
- return 0;
- }
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