Cod sursa(job #1316245)

Utilizator Denisa13Stefan Denisa Denisa13 Data 13 ianuarie 2015 17:39:20
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
int v[2000005];

int main()
{
    unsigned int n,i,j,s=0;
    f>>n;
    for(i=2;i<=n;i++)
        if(v[i]==0)
        {
            s++;
            for(j=i*2;j<=n;j+=i)
                v[j]=1;
        }
    g<<s;
    return 0;
}