Cod sursa(job #191588)
| Utilizator | Data | 27 mai 2008 14:16:57 | |
|---|---|---|---|
| Problema | Sum | Scor | 0 |
| Compilator | cpp | Status | done |
| Runda | Arhiva de probleme | Marime | 0.38 kb |
#include <stdio.h>
long long n,i,j,a[100002],x;
int main()
{
freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
scanf("%lld",&n);
for (i=1; i<=100000; ++i) a[i]=i-1;
while (n)
{
--n;
scanf("%d",&x);
for (i=2; i<=x; ++i)
for (j=i*2; j<=x; j+=i) a[j]-=a[i];
for (i=0, j=0; i<=x; ++i, j+=a[i]);
printf("%lld\n",2*x*a[x]);
}
return 0;
}