Cod sursa(job #1641739)

Utilizator mariusn01Marius Nicoli mariusn01 Data 9 martie 2016 10:22:36
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.3 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
ifstream fin ("ciur.in");
ofstream fout ("ciur.out");
int n,i,c,j;
char v[2000001];
int main() {
    fin>>n;
    for(i=2;i<=n;i++)
        if(v[i]==0){
            c++;
            for(j=i+i;j<=n;j+=i)
                v[j]=1;
        }

    fout<<c;
}