Cod sursa(job #776880)

Utilizator oana_popfmi - pop oana oana_pop Data 10 august 2012 16:27:09
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");

char a[2000001];
int nr, n , i , j;

int main()
{   
    

    
    fin>>n;
    for(i=2; i<=n; i++)
    if(a[i]==0)
    {    nr++;
         for(j=i+i; j<=n; j+=i)
         a[j]=1;
     }
    fout<<nr;
    return 0;
}