Cod sursa(job #2058151)

Utilizator iminbluePana Adrian iminblue Data 5 noiembrie 2017 11:08:45
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");
char ciur [2000001];
int n,nr,i,j;
int main()
{f>>n;
ciur[0]=1;
ciur[1]=1;
for (i=1;i<=n;i++)
    if (ciur[i]==0)
    {nr++;
    for (j=i*i;j<=n;j=j+i)
    ciur[j]=1;
}
g<<nr;}