swea. min max

T = int(input())
 
for i in range(0, T):
    U = int(input())
    case_in = list(map(int, input().split()))
 
    case_max = max(case_in)
    case_min = min(case_in)
    case = case_max - case_min
    i += 1
    print(f'#{i} {case}')