Cod sursa(job #1438529)

Utilizator alexmihaitTuliga Mihai Alexandru alexmihait Data 20 mai 2015 10:32:28
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
bool ciur[2000001];
ifstream in("ciur.in");
ofstream out("ciur.out");
int main()
{
    int i,j,c=0,N;
    in>>N;
    for(i=2;i<=N;i++)
       ciur[i]=1;
    for(i=2;i<=N;i++)
    if(ciur[i])
    {
        c++;
        for(j=2*i;j<=N;j=j+i)
         ciur[j]=0;
    }
    out<<c;
    return 0;
}