poj1118

#include

using namespace std;

typedef struct dian{

int x,y;

}dian;

int main(){

int n;

while(cin>>n&&n){

dian stu[705];

for(int i=0;i

 cin>>stu[i].x>>stu[i].y;

 int max=0,cnt;

for(int i=0;i

 for(int j=i+1;j

  cnt=0;

  for(int k=j+1;k

  {

  intleft=(stu[j].y-stu[i].y)*(stu[k].x-stu[i].x);

  intright=(stu[k].y-stu[i].y)*(stu[j].x-stu[i].x);

  if(left==right) cnt++;

  }

  max=max>cnt? max:cnt;

 }

 cout<<max+2<<endl;

}

return 0;

}