Cod sursa(job #1141905)

Utilizator iarbaCrestez Paul iarba Data 13 martie 2014 11:55:24
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.29 kb
Raporteaza aceasta sursa 
#include <cstdio>
using namespace std;
int i,j,n,t,ciur[2000001];
int main()
{
	freopen("ciur.in","r",stdin);
	freopen("ciur.out","w",stdout);
	scanf("%ld",&n);t=n-1;
	for(i=2;i<=n;i++){
		if(ciur[i]){--t;}
		else{for(j=2;j<=n/i;j++){ciur[i*j]=1;}}
					 }
	printf("%ld",t);
return 0;
}