Cod sursa(job #2052217)

Utilizator iminbluePana Adrian iminblue Data 30 octombrie 2017 11:09:47
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 f("ciur.in");
ofstream g("ciur.out");
int n,i,j,a[2000001],nr=1;
int main()
{f>>n;
a[2]=1;
for (i=3;i<=n;i=i+2)
 a[i]=1;
for (i=3;i<=n;i=i+2)
if (a[i]==1) {nr++;
for (j=2*i;j<=n;j=j+i)
    a[j]=0;}
g<<nr;
}