Cod sursa(job #381961)

Utilizator razvanuzuCiocoiu Razvan-Andrei razvanuzu Data 12 ianuarie 2010 12:01:23
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.25 kb
Raporteaza aceasta sursa 
#include <fstream.h>
long v[2000001],n,i,j,np;
ifstream fin ("ciur.in");
ofstream fout ("ciur.out");
int main ()
{
	fin>>n;
	for (i=3;i<=n;i=i+2)
		if (v[i]==0)
		{
			np++;
			for (j=i+i;j<=n;j=j+i)
				v[j]=1;
		}
fout<<np+1;
return 0;
}