Cod sursa(job #657809)

Utilizator Stefex09Stefan Teodorescu Stefex09 Data 7 ianuarie 2012 14:26:49
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include<stdio.h>
int main()
{
	freopen("ciur.in","r",stdin);
	freopen("ciur.out","w",stdout);
	int n,nrp=0,m;int *ciur;
	scanf("%ld",&n);m=n*(n/2);
	ciur=new int[m];
	for(int i=2;i<=n/2;i++)
		for(int j=i;j<=n/2;j++)
			ciur[i*j]=1;
	for(int a=1;a<=n;a++)
		if(!ciur[a]) nrp++;
	printf("%ld",nrp);
	return 0;
}