Cod sursa(job #45053)
Utilizator | Ioana Ardeleanu yoyolich | Data | 31 martie 2007 23:17:11 |
---|---|---|---|
Problema | Trapez | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.53 kb |
#include<stdio.h>
FILE *f=fopen("trapez.in","r"), *g=fopen("trapez.out","w");
struct nod{int x, y;} a[1001];
int n,nr,b[1002001],k,m,i,j,ok,t1,t2;
int main()
{
fscanf(f,"%d",&n);
for(i=1;i<=n;i++)
fscanf(f,"%d %d",&a[i].x,&a[i].y);
fclose(f);
for(i=1;i<n;i++)
for(j=i+1;j<=n;j++)
{
t1=a[i].y-a[j].y;
t2=a[i].x-a[j].x;
if(t2==0) b[++m]=t1;
else
b[++m]=t1/t2;
}
for(i=1;i<n;i++)
for(j=i+1;j<=n;j++)
if(b[i]==b[j])nr++;
fprintf(g,"%d\n",nr);
fclose(g);
return 0;
}