Cod sursa(job #752783)

Utilizator Mircea2002Ceobanu Mircea Mircea2002 Data 29 mai 2012 15:46:52
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.3 kb
Raporteaza aceasta sursa 
#include<iostream>
#include<fstream>
using namespace std;
int main()
{	int i,n,k=0;
	ifstream f("ciur.in");
	ofstream g("ciur.out");
	f>>n;
	char v[2000001];
	for(i=2;i<=n;i++)
		v[i]=i;
	for(i=2;i<=n;i++)
		if(v[i])
		{	k++;
			for(int j=i+i;j<=n;j+=i)
				v[j]=0;
		}
	g<<k;
	return 0;
}