Cod sursa(job #627943)

Utilizator d.andreiDiaconeasa Andrei d.andrei Data 31 octombrie 2011 00:06:18
Problema Sum Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.41 kb
#include <cstdio>

#define file_in "sum.in"
#define file_out "sum.out"

#define nmax 100000

int T,i,j,v[nmax],N;

int main(){
	
	freopen(file_in,"r",stdin);
	freopen(file_out,"w",stdout);
	
	scanf("%d", &T);
	
	for (i=1;i<=nmax;++i)
		 v[i]=i-1;
	for (i=2;i<=nmax;++i)
		 for (j=i+i;j<=nmax;j+=i)
			  v[j]-=v[i];
	while(T--){
		scanf("%d", &N);
		printf("%lld\n", v[N]*N*2);
	}
	
	return 0;
}