Cod sursa(job #2643423)

Utilizator alexandru-andreiCarmici Alexandru-Andrei alexandru-andrei Data 19 august 2020 19:45:03
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.36 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
int main()
{
    ifstream f("ciur.in");
    ofstream g("ciur.out");
    unsigned long long n,nr=0;
    bool ok;
    f>>n;
    for(unsigned long long i=2;i<=n;++i)
    {
        ok=true;
        for(unsigned long long j=2;j*j<=i;++j)
            if(i%j==0)
                ok=false;
        if(ok)
            ++nr;
    }
    g<<nr;
}