Cod sursa(job #779353)

Utilizator Bigb21Avram Bogdan Bigb21 Data 17 august 2012 15:31:25
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std; 
ifstream in("ciur.in"); 
ofstream out("ciur.out"); 
bool a[2000000];
int main ()
 { 
	long p,i,n;
	int k=0;
	in>>n;   
	for(i=2;i<=n;i++)
		if(a[i]==0) 
		{   p=2;
		 while((p*i)<=n)
            { 			 
			 a[p*i]=1; 
			  p++;
            } 
          k++;		 
		} 
    
out<<k; 
}