Cod sursa(job #156668)

Utilizator razvi9Jurca Razvan razvi9 Data 12 martie 2008 18:07:26
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;
int n,i,j,nr;
char a[2000001];
int main()
{
	ifstream f("ciur.in");
	ofstream g("ciur.out");
	f>>n;
	a[1]=1;
	for(i=2;i<=n;i++)
		if(a[i]==0){nr++;
			for(j=i*2;j<=n;j+=i)
				a[j]=1;}
	g<<nr<<endl;
/*	for(i=2;i<=n;i++)
		if(a[i]==0){
			nr--;
			if(nr<1000) g<<i<<" ";}
	g.close();*/
}