Cod sursa(job #3128745)

Utilizator otilia_nedelcu@yahoo.comGutanu Tiberiu [email protected] Data 10 mai 2023 19:41:11
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp-64 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 n,nr,ciur[2000001],i,j;
int main()
{
    f>>n;
    for(i=2;i<=n;i++)
        ciur[i]=1;
    for(i=2;i<=n;i++)
        if(ciur[i])
    {nr++;
        for(j=i*i;j<=n;j=j+i)
            ciur[j]=0;

    }
    g<<nr;
    return 0;
}