Cod sursa(job #548896)

Utilizator Alexandru13Dumitraiche Marius-Alexandru Alexandru13 Data 7 martie 2011 21:56:29
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.28 kb
Raporteaza aceasta sursa 
#include<fstream.h>
ifstream f("ciur.in");
ofstream g("ciur.out");
long n,i,x=0,j,a[2000000];
int main()
{
	f>>n;
	for(i=1;i<=n;i++)
		a[i]=1;
	for(i=1;i<=n;i++)
		if(a[i]==1)
		{
			for(j=i;j<=n;j+=i)
				a[j]=0;
			x++;
		}
	g<<x;
	return 0;
	f.close();
	g.close();
}