Cod sursa(job #525780)

Utilizator adina.licsorLicsor Adina adina.licsor Data 26 ianuarie 2011 11:03:27
Problema Ciurul lui Eratosthenes Scor 30
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");
int i,nr,n,j,prim[2000100];
int main ()
{
	f>>n;
	nr=0;
	for (i=2;i<=n;i++)
		if (!prim[i])
			for (j=i+i;j<=n;j+=i)
				prim[j]=1;
		for (i=2;i<=n;i++)
			if(!prim[i])
				nr++;
			g<<nr;
			return 0;
}