Cod sursa(job #2356367)

Utilizator miha2007cpopa mihai miha2007c Data 26 februarie 2019 17:17:05
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include <bits/stdc++.h>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
bool p[2000001];
int n,j,i,np=0;

int main()
{
    f>>n;
    for(i=2;i<=n;i++)

        if(p[i]==0)

        {
            np++;
            for(j=i+i;j<=n;j=j+i)
                    p[j]=1;
        }

    g<<np;
    return 0;
}