Cod sursa(job #543132)

Utilizator Ast09Stoica Anca Ast09 Data 27 februarie 2011 16:30:05
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.29 kb
Raporteaza aceasta sursa 
#include<fstream.h>
ifstream f("ciur.in");
ofstream g("ciur.out");
long n;
char v[2000001];
int i,y,nr;
int main ()
{
f>>n;
for(i=2;i<=n;i++)
	v[i]=0;
for(i=2;i<=n;i++)
	if(v[i]==0) {nr++;
				y=2;
				while(y*i<=n) v[y*i]=1,y++;
				}
g<<nr;
f.close();
g.close();
return 0;
}