Cod sursa(job #2233841)

Utilizator XXMihaiXX969Gherghinescu Mihai Andrei XXMihaiXX969 Data 24 august 2018 16:02:27
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
int i,j,p,n;
bool v[2000001];
ifstream in("ciur.in");
ofstream out("ciur.out");
int main()
{in>>n;
p=0;
for(i=1;i<=n;i++)
    v[i]=0;
for(i=2;i<=n;i++){
    if(v[i]==0){
    p++;
    for(j=2*i;j<=n;j+=i)
        v[j]=1;
    }
}
    out<<p;

return 0;
}