Cod sursa(job #583146)

Utilizator gaby123Oprinoiu Gabriel gaby123 Data 18 aprilie 2011 11:16:04
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.22 kb
Raporteaza aceasta sursa 
#include<fstream.h>
char a[2000001];
int main()
{int N,i,j,nr=0;
ifstream f("ciur.in");
ofstream g("ciur.out");
f>>N;
for(i=2;i<=N;i++)
 if(!a[i])
	 {nr++;
	  for(j=2*i;j<=N;j+=i)
		a[j]=1;
	 }
g<<nr;
return 0;
}