Cod sursa(job #1211755)

Utilizator Dorian7Casapu Dorian Dorian7 Data 23 iulie 2014 11:37:05
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include<iostream>
#include<fstream>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");

int main()

{
    char a[2000001]; long int n,i,j,nr;
    f>>n;
    for(i=2;i<=n;i++)
    a[i]=1;
    nr=0;
    for(i=2;i<=n;i++)
    if(a[i]==1)
        {nr++;
        for(j=i+i;j<=n+i;j+=i)
        a[j]=0;
        }
    cout<<nr;
}