85 lines
1.6 KiB
C++
85 lines
1.6 KiB
C++
#include <cstdio>
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#include <algorithm>
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#include <string>
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#include <cstring>
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#include <stack>
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#include <cmath>
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#include <queue>
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#include <list>
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#include <cstdlib>
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#include <vector>
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#include <set>
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#include <map>
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#include <sstream>
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#include <iostream>
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#include <stack>
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using namespace std;
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#define ISZREO(x) (fabs(x)<1e-7)
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const double PI = acos(-1.0);
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struct Point
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{
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double x,y;
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}a[1100],c[1100],Q;
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double b[800];
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void fun1(int n)
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{
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int i;
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for(i=0;i<n;i++)
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{
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c[i].x=a[i].x-Q.x;
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c[i].y=a[i].y-Q.y;
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}
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}
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void fun2(int n)
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{
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int i;
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for(i=0;i<n;i++)
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{
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b[i]=atan2(c[i].y,c[i].x);
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if(b[i]<0)b[i]+=PI;
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}
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sort(b,b+n);
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}
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int main()
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{
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int i,n,j,ans,cy;
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double ji,p;
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Point temp;
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while(~scanf("%d",&n))
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{
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for(i=0;i<n;i++)
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{
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scanf("%lf %lf",&a[i].x,&a[i].y);
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}
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ans=0;
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for(i=0;i<n;i++)
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{
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Q=a[i];
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fun1(n);
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fun2(n);
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ji=-9999999.99;
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for(j=0;j<n;j++)
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{
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if(!ISZREO(ji-b[j]))
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{
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cy=1;
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ji=b[j];
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}
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else
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{
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cy++;
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if(cy>ans)
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{
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ans=cy;
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p=ji;
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}
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}
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}
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}
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if(ans == 0)ans++;
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if(!ISZREO(p))ans++;
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printf("%d\n",ans);
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}
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return 0;
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}
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