Cod sursa(job #782669)

Utilizator 5t3fristea stefan 5t3f Data 28 august 2012 17:26:54
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.25 kb
Raporteaza aceasta sursa 
#include "fstream"
using namespace std;
char a[2000000];
int n,nr,i,j,ok;
int main()
{
	ifstream f("ciur.in");
	ofstream g("ciur.out");
	f>>n;
	for(i=2;i<=n;i++)
		if(a[i]==0)
		{
			for(j=i+i;j<=n;j+=i)
				a[j]=1;
			nr++;
		}
	g<<nr;
}