Cod sursa(job #752781)

Utilizator Mircea2002Ceobanu Mircea Mircea2002 Data 29 mai 2012 15:44:34
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include<iostream>
#include<fstream>
using namespace std;
int main()
{	int i,n;
	short int k=1;
	ifstream f("ciur.in");
	ofstream g("ciur.out");
	f>>n;
	char v[2000001];
	for(i=3;i<=n;i+=2)
		v[i]=i;
	for(i=3;i<=n;i+=2)
		if(v[i])
		{	k++;
			for(int j=i+i;j<=n;j+=i)
				v[j]=0;
		}
	g<<k;
	return 0;
}