Cod sursa(job #2535268)

Utilizator BereaBerendea Andrei Berea Data 31 ianuarie 2020 18:21:03
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.3 kb
Raporteaza aceasta sursa 
#include <iostream>

using namespace std;
int n,i,c,j;
bool v[2000001];

int main()
{
    fin>>n;
    c++;
    for (i=3;i<=n;i=i+2) v[i]=1;
    for (i=3;i<=n;i+=2)
    {
        if (v[i])
        {
            c++;
            for (j=i+i;j<=n;j+=i) v[j]=0;
        }
    }
    fout<<c;
}