Cod sursa(job #1559121)

Utilizator AndronicAlx99Andronic Alexandra AndronicAlx99 Data 30 decembrie 2015 10:43:58
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
#define Max 1000000
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int n,i,j,ok[Max],nr;
int main()
{fin>>n;
for(i=2;i<n;i++)
    ok[i]=0;
for(i=2;i*i<n;i++)
    for(j=2;i*j<n;j++)
    ok[i*j]=1;
for(i=2;i<n;i++)
if(ok[i]==0) {nr++;}
    fout << nr;
    return 0;
}