Cod sursa(job #728067)

Utilizator OwnedCheciches Marius Owned Data 28 martie 2012 14:31:03
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.31 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;

int main(){
	long n,i,np=0;
	char c[2000001];
	ifstream f("ciur.in");
	ofstream g("ciur.out");
	f>>n;
	for(i=2;i<=n;i++)
		c[i]=1;
	for(i=2;i<=n;i++)
	if(c[i]){
		np++;
		for(long j=i+i;j<=n;j=j+i)
			c[j]=0;}
	g<<np;
	f.close();
	g.close();
	return 0;}