Cod sursa(job #361338)

Utilizator federerUAIC-Padurariu-Cristian federer Data 4 noiembrie 2009 18:12:02
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda CNRV #4 Marime 0.3 kb
Raporteaza aceasta sursa 
#include <stdio.h> 
char v[2000000]; 
int main ()
{ int N,i,j,nr=0;
FILE *f=fopen("ciur.in","r");
FILE *g=fopen("ciur.out","w");
fscanf (f,"%d",&N);
for (i=2; i<=N; i++)

if (v[i]==0) { nr++;

for (j=2*i; j<=N; j+=i)

v[j]=1;

}
fprintf(g,"%d",nr);
fclose (f);
fclose (g);
return 0;
}