Cod sursa(job #613943)

Utilizator dtoniucDaniel Toniuc dtoniuc Data 5 octombrie 2011 09:22:55
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.3 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
int x[2000005];
int main()
{
	int n,nr=0;
	ifstream fin("ciur.in");
	ofstream fout("ciur.out");
	fin>>n;
	for (int i=2;i<=n;i++)
	{
		if(x[i]==0)
		{
			nr++;
			for(int j=2;i*j<=n;j++)
				x[i*j]=1;
		}
	}
	fout<<nr;
	return 0;
}