Cod sursa(job #387640)

Utilizator KoniacDocea Andrei Koniac Data 28 ianuarie 2010 08:52:23
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.31 kb
Raporteaza aceasta sursa 
#include<stdio.h>
int n,x,d,i,j;
int v[2000001];
int main(){
	FILE * f = fopen("ciur.in","r");
	fscanf(f,"%d",&n);
	fclose(f);
	for(i=2;i<=n;i++){
		if(v[i]==0){
			x++;
			for(j=i+i;j<=n;j+=i)
				v[j]=1;
		}
	}
	
	FILE * g = fopen("ciur.out","w");
	fprintf(g,"%d",x);
	fclose(g);
	return 0;
}