Cod sursa(job #2383153)

Utilizator Benten3000Alexandru Benteu Benten3000 Data 19 martie 2019 09:33:52
Problema Ciurul lui Eratosthenes Scor 50
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include <bits/stdc++.h>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int v[2000001];
int main()
{
    int n,c=0;
    fin>>n;
    for (int i=2;i<=n;++i)
        if (v[i]==0)
        for (int j=2;j<=n/i;++j)
        v[i*j]=1;
    for (int x=2;x<=n;++x)
        if (v[x]==0) c++;
    fout<<c;
}