Cod sursa(job #2244541)

Utilizator ShumaherAdasga Shumaher Data 22 septembrie 2018 23:54:24
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;

int main()
{ifstream f("ciur.in");
ofstream g("ciur.out");
int N,k=0;
char a[2000004];
f>>N;
for(int i=2;i<=N;i++)
    a[i]=1;
for(int i=2;i<=N;i++)
   {

   if(a[i])
        {k++;
for(int j=i+i;j<=N;j=j+i)
    a[j]=0;}}
    g<<k;
    return 0;}