Cod sursa(job #559252)

Utilizator mihai_iahimPetrisor Mihai mihai_iahim Data 17 martie 2011 18:37:04
Problema Fractii Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.33 kb
Raporteaza aceasta sursa 
#include <stdio.h>
long a[1000010];
long i, j, n; 
long long s;
int main()
{
freopen("fractii.in", "r", stdin);
freopen("fractii.out", "w", stdout);
scanf("%d\n", &n);
for(i=2; i<=n; i++)
	a[i]=0;

for(i=2; i<=n; i++)
{
a[i]=i-1;
for(j=2; i*j<=n; j++)
{
a[i*j]=a[i*j]-a[i];
}
s=s+a[i];
}
printf("%lld\n", s*2+1);

}