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Cod sursa(job #306669)
#include<fstream.h>
#include<iostream.h>
ifstream f("trapez.in");
ofstream g("trapez.out");
void main(){
long int x[1001],y[1001];
int i,j,n,k;
short int ok;
f>>n;
for(i=0;i<n;i++)
{
f>>x[i];
f>>y[i];
}
long el,aux;
k=0;
int seek;
for(i=0;i<n;i++)
{
seek=0;
aux=2;
el=x[i];
j=i+1;
while(aux>0 && j<n)
{
if(el==x[j]) {
seek++;
aux--;
k++;
}
j++;
}
if(seek) k++;
}
ok=0;
for(i=0;i<n;i++)
{
seek=0;
aux=2;
el=y[i];
j=i+1;
while(aux>0 && j<n)
{
if(el==x[j]) {
seek++;
aux--;
ok++;
}
j++;
}
if(seek) ok++;
}
g<<(ok+k)/4;
f.close();
g.close();
}