Cod sursa(job #1280286)

Utilizator AndrewMMusat Andrei AndrewM Data 1 decembrie 2014 18:31:40
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.29 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
ifstream in("ciur.in");
ofstream out("ciur.out");
long p[2000001];
int main()
{long n,nr=0,j,i;
in>>n;
for(i=2;i<=n;i++)
    if(p[i]==0){nr++;
    for(j=2*i;j<=n;j+=i)
        p[j]=1;
    }
    out<<nr;
return 0;
}