Cod sursa(job #1914177)

Utilizator AndreeaAmzaAndreea Amza AndreeaAmza Data 8 martie 2017 15:51:18
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
ifstream f ("ciur.in");
ofstream g ("ciur.out");
int n,i,j,k,v[2000001];

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