Cod sursa(job #234589)

Utilizator stefynr8Space Monkey stefynr8 Data 21 decembrie 2008 11:30:38
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.36 kb
Raporteaza aceasta sursa 
#include <stdio.h>
#include <math.h>

FILE *f,*g;

long p[2000001];

int main()
{

 f=fopen("ciur.in","r");
 g=fopen("ciur.out","w");

 long n,i,j,k=0;

 fscanf(f,"%ld",&n);


 i=2;
 while(i<=n)
 {
   if(p[i]==0){
		k++;
		for(j=i+i;j<=n;j=j+i) p[j]=1;
	      }
   i++;
   }
 fprintf(g,"%ld",k);
 fclose(f);
 fclose(g);
 return 0;
}