Cod sursa(job #631634)

Utilizator Bogdy4FuNBogdan Ciubotaru Bogdy4FuN Data 9 noiembrie 2011 10:34:09
Problema Ciurul lui Eratosthenes Scor 20
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include<fstream>
#define NMax 200000
using namespace std;

ifstream f("ciur.in");
ofstream g("ciur.out");

int main ()
{
	long int n;
	f>>n;
	int v[NMax],ex=0;
	for (int i=1;i<=n;i++)
		v[i]=i;
	for (int i=2;i<=n/2;i++)
		for (int j=2;j<n/2;j++)
			v[i*j]=0;
	for(int i=2;i<=n;i++)
		if(v[i]!=0)
			ex++;
	g<<ex;
	return 0;
}