Cod sursa(job #1605334)

Utilizator Alexandru_Arama Alexandru Alexandru_ Data 18 februarie 2016 22:13:07
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
int n,i,j,k;
char a[2000001];
int main()
{
    ifstream fin ("ciur.in");
    ofstream fout ("ciur.out");
    fin>>n;k=1;
    for(i=2;i<=n;i++)
        if(a[i]==0){k++;
        for(j=2;j*i<=n;j++)
        a[i*j]='1';}
    fout<<k;
    return 0;
}