Cod sursa(job #543662)

Utilizator lunat1cHobinca Bogdan lunat1c Data 28 februarie 2011 13:50:09
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.29 kb
Raporteaza aceasta sursa 
#include <fstream>

using namespace std;

bool a[2000001];

int main()
{
	int n,i,k=0;
	ifstream in("ciur.in");
	ofstream out("ciur.out");
	in>>n;
	for(i=2; i<=n; i++)
		if(a[i]==false)
		{
			for(int j=i; j<2000002; j=j+i)
				a[j]=true;
			k++;
		}
	out<<k;
	return 0;
}