Cod sursa(job #766191)

Utilizator DenisONIcBanu Denis Andrei DenisONIc Data 10 iulie 2012 16:03:02
Problema Fractii Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.34 kb
Raporteaza aceasta sursa 
#include <cstdio>
FILE *f=fopen("fracti.in","r");
FILE *g=fopen("fracti.out","w");
long long nr=0,v[100001];
int n,i,j;
int main()
{
	fscanf(f,"%d",&n);
	for (i=1;i<=n;i++)
		v[i]=i-1;
	for (i=2;i<=n;i++)
	{
		for (j=i*2;j<=n;j=j+i)
			v[j]=v[j]-v[i];
		nr=nr+v[i];
	}
	nr=nr*2+1;
	fprintf(g,"%lld",nr);
	fclose(f);
	return 0;
}