Cod sursa(job #562202)

Utilizator noruIlies Norbert noru Data 22 martie 2011 16:51:12
Problema Ciurul lui Eratosthenes Scor 20
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include<fstream.h>
int v[2000001];
int main()
{
	int n,i,k=4;
	ifstream f("ciur.in");
	ofstream g("ciur.out");
	f>>n;
	for (i=2;i<=n;i+=2)
		v[i]=1;
	for (i=3;i<=n;i+=3)
		v[i]=1;
	for (i=5;i<=n;i+=5)
		v[i]=1;
	for (i=7;i<=n;i+=7)
		v[i]=1;
	for (i=2;i<=n;i++)
		if (v[i]==0) k++;
	g<<k;
	return 0;
}