Cod sursa(job #2428572)

Utilizator Dragos1226Dragos Chileban Dragos1226 Data 5 iunie 2019 20:08:28
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n,i,j,c=0;
    cin>>n;
    bool a[2000000];
    for(i=2;i<=n;i++)
        a[i]=true;
    for(i=2;i<=n;i++)
    {
        if(a[i]==true)
        {
            c++;
            for(j=i+i;j<=n;j=j+i)
                a[j]=false;
        }
    }
    cout<<c;
}