Cod sursa(job #2370133)

Utilizator adivd15Costea Adrian adivd15 Data 6 martie 2019 10:49:53
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.3 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;
int n,i,j,p;
bool c[20000001];
ifstream f("ciur.in");
ofstream g("ciur.out");
int main()
{
    f>>n;
    for(i=2;i<n;i++)
        if(c[i]==0){
        p++;
            for(j=i+i;j<=n;j=j+i)
                c[j]=1;
        }
    g<<p;
    return 0;
}