Cod sursa(job #2100255)

Utilizator marcudanfDaniel Marcu marcudanf Data 5 ianuarie 2018 14:13:21
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.27 kb
Raporteaza aceasta sursa 
#include <bits/stdc++.h>

using namespace std;

ifstream fin("ciur.in");
ofstream fout("ciur.out");

int n, nr;
bool p[2000005];

int main(){
	fin>> n ;
	for(int i = 2; i <=n; i++)
		if(!p[i]){
			nr++;
			for(int j = i + 1; j<=n; j+=i)
				p[i] = 1;
		}
	fout<< nr ;
	return 0;
}