Cod sursa(job #1816961)

Utilizator AlexiaElena123Alexia Elena AlexiaElena123 Data 27 noiembrie 2016 10:51:48
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <cstdio>

using namespace std;
int i,k,n,j;
bool v[2000001];
int main()
{
    freopen("ciur.in","r",stdin);
    freopen("ciur.out","w",stdout);
    scanf("%d",&n);k=0;
    for(i=2;i<=n;i++)
        if(v[i]==0)
        {  k++;
            for(j=i+i;j<=n;j=j+i)
                v[j]=1;
        }
    printf("%d",k);
    return 0;
}