Cod sursa(job #1367494)

Utilizator TimoteiCopaciu Timotei Timotei Data 1 martie 2015 21:48:19
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
#include<bitset>
using namespace std;
int n,i,j,s,x;
bitset <2000009> v;
int main()
{
   ifstream f("ciur.in");
   ofstream g("ciur.out");
   f>>x;
   for(i=2;i<=x/2;i++)
    if(v[i]==0)for(j=2;j<=x/i;j++)v[i*j]=1;
   for(i=2;i<=x;i++)if(v[i]==0)s++;
   g<<s;
    return 0;
}