Cod sursa(job #2359426)

Utilizator CodCatalinCodreanu Catalin CodCatalin Data 28 februarie 2019 20:41:17
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.31 kb
Raporteaza aceasta sursa 
#include <iostream>
using namespace std;

int n,v[2000001],nr;
//
int main()
{
    cin>>n;
    v[1]=1;
    for(int i=2;i<=2000000;++i)
        if(v[i]==0)
        for(int j=2*i;j<=2000000;j=j+i)
    {
        v[j]=1;
    }
    for(int i=1;i<=n;++i)if(v[i]==0)nr++;
    cout<<nr<<'\n';
    return 0;
}