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无视精度,1a,代码#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#define M 205
using namespace std;
struct node
{
int x;
int y;
bool operator<(const node &t)const
{
if(x*t.x>0)
{
if(y*t.x-x*t.y<0)
return true;
else
return false;
}
else
{
if(y*t.x-x*t.y<0)
return false;
else
return true;
}
}
bool operator==(const node &t)const
{
return y*t.x-x*t.y==0;
}
};
node a[M*M];
int n,x[M],y[M];
int main()
{
// freopen("1.txt","r",stdin);
while(scanf("%d",&n)!=EOF)
{
int i,j,k,p;
int sum;
for(i=1;i<=n;i++)
scanf("%d%d",&x[i],&y[i]);
for(i=1,k=1,p=0;i<=n;i++)
{
for(j=i+1;j<=n;j++)
{
a[k].x=x[i]-x[j];
a[k].y=y[i]-y[j];
if(a[k].x==0)
{
p=1;
continue;
}
k++;
}
}
sort(a+1,a+k);
for(i=2,j=1,sum=1+p;i<k;i++)
{
if(!(a[i]==a[j]))
{
j=i;
sum++;
}
}
printf("%d\n",sum);
}
return 0;
}
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