Cod sursa(job #410709)

Utilizator ghedany92Gheorghita Daniel ghedany92 Data 4 martie 2010 15:50:43
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.29 kb
Raporteaza aceasta sursa 
#include<fstream.h>
ifstream fin("ciur.in");
ofstream fout("ciur.out");
char a[2000005];
long i,j,n,nr;
int main()
{
	nr=0;
	fin>>n;
	for (i=2;i<=n;i++)
		a[i]=1;
	for (i=2;i<=n;i++)
		if (a[i]==1)
		{
			nr++;
			for (j=2*i;j<=n;j+=i)
				a[j]=0;
		}
	fout<<nr;
	return 0;
}