Q=int(input())
for _ in range(Q):
  N=int(input())
  A=list(map(int,input().split()))
  l=A[0]
  r=A[0]
  v=[-10**15]*N
  c=A[0]
  for i in range(1,N-1):
    c+=A[i]
    x=abs(c-l)
    y=abs(c-r)
    score=max(abs(x)+abs(l),abs(y)+abs(r))
    v[i]=score
    l=min(l,c)
    r=max(r,c)
  z=sum(A)
  u=[0]*N
  for i in range(N):
    u[i]=u[i-1]+A[i]
  result=-10**10
  for i in range(1,N-1):
    w=abs(z-u[i])
    result=max(result,w+v[i])
  print(result)