Cod sursa(job #2495331)

Utilizator teisanumihai84Mihai Teisanu teisanumihai84 Data 19 noiembrie 2019 10:10:30
Problema Ciurul lui Eratosthenes Scor 50
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
int p[2000001], i, j, n, sol;
int main ()
{
    ifstream fin ("ciur.in");
    ofstream fout ("ciur.out");
    fin>>n;
    p[2]=0;
    for (i=2; i<=n; i++)
        if (p[i]==0)
        {
            sol++;
            for (j=2*i; j<=n; j+=i)
                p[j]=1;
        }
    fout<<sol;
}