Cod sursa(job #153431)

Utilizator katakunaCazacu Alexandru katakuna Data 10 martie 2008 15:35:39
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.31 kb
Raporteaza aceasta sursa 
#include<stdio.h>

char v[2000005];
int n,j,i,nr;

int main(){


FILE *f=fopen("ciur.in","r");
fscanf(f,"%d",&n);
fclose(f);


 for(i=2;i<=n;i++){
  if(v[i]==0)nr++;

   for(j=i+i;j<=n;j+=i){
   v[j]=1;
   }

 }



FILE *g=fopen("ciur.out","w");
fprintf(g,"%d",nr);
fclose(g);

return 0;
}