> #include"stdio.h"
> #include"stdlib.h"
4
2 2
2 3
1 1
1 1

> #define N 700
> int lineCount(struct Poin *point,int n);
> int judge(int *a,int *b);
> struct Poin 
> {
> 	int x;
> 	int y;
> };
> void main()
> {
> 	int i,j,n;
> 	struct Poin point[N];
> 	while(1)
> 	{
> 		scanf("%d",&n);
> 		if(n==0)
> 			break;
> 		for(i=0;i<n;i++)
> 			scanf("%d %d",&point[i].x,&point[i].y);
> //j=lineCount(point,n);
> 		printf("%d\n",lineCount(point,n));
> 
> 	}
> 	system("pause");
> }
> int lineCount(struct Poin *point,int n)
> {
> 	int i,j,k,lineC=3,temp=2;
> 	int p[2]={0},q[2]={0};
> 	if(n<3)
> 		return n;
> 	for(i=0;i<n;i++)
> 	{
> 		for(j=0;j<n&&j!=i;j++)
> 		{
> 			temp=2;
> 			p[0]=point[j].x-point[i].x;
> 			p[1]=point[j].y-point[i].y;
> 				for(k=0;k<n&&k!=j&&k!=i;k++)
> 				{
> 					q[0]=point[k].x-point[i].x;
> 					q[1]=point[k].y-point[i].y;
> 					if(judge(p,q))
> 						temp++;
> 
> 				}
> 				if(lineC<temp)
> 					lineC=temp;
> 
> 		}
> 	}
> return lineC;
> }
> int judge(int *a,int *b)
> {
> 	int i,j,m,n;
> 	i=a[0];
> 	j=a[1];
> 	m=b[0];
> 	n=b[1];
> 	if((i*n-j*m)==0)
> 		return 1;
> 	else
> 		return 0;
> }