Cod sursa(job #719983)

Utilizator swim406Teudan Adina swim406 Data 22 martie 2012 11:21:47
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.3 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;
int A[200001];
int main() {
	ifstream f("ciur.in");
	ofstream g("ciur.out");
	int n,count=0;
	f>>n;
	for(int i=2;i<=n/2;i++)
		if(!A[i])
			for(int j=2;j<=n/i;j++) 
				A[j*i]=1;
	for(int i=2;i<=n;i++) 
		if(!A[i]) 
			count++;
	g<<count;
	return 0;
}