Cod sursa(job #2227633)

Utilizator AlexPascu007Pascu Ionut Alexandru AlexPascu007 Data 1 august 2018 11:31:58
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.28 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int i,j,n,nr,f[2000000];
int main() {
	fin>>n;
	f[0]=1; f[1]=1;
	for (i=2;i<=n;i++) {
		for (j=2*i;j<=n;j+=i) {
			f[j]=1;
		}
		if (f[i]==0)
			nr++;
	}
	fout<<nr;
	return 0;
}