Cod sursa(job #541330)

Utilizator daniel.florinPitis Daniel-Florin daniel.florin Data 25 februarie 2011 00:18:16
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.29 kb
Raporteaza aceasta sursa 
#include <cstdio>

long v[50000];

int main() 
{
	long n,i,j,pr=0;
	freopen("ciur.in","r",stdin);
	freopen("ciur.out","w",stdout);
	scanf("%ld", &n);
	for(i=2; i<=n; ++i)
	{
		if(not v[i])
		{
			pr++;
			for(j=2; j<=n/i; ++j)
				v[i*j]=1;
		}
	}
	printf("%ld",pr);
	return 0;
}