import sys
input = sys.stdin.readline
t=int(input())
for _ in range(t):
  n=int(input())
  a=list(map(int,input().split()))
  rui=[0]
  for i in range(n-1,-1,-1):
    rui.append(rui[-1]+a[i])
  rui.reverse()
  ans=0
  now=a[0]
  mi=a[0]
  ma=a[0]
  for j in range(1,n-1):
    now+=a[j]
    val0=abs(mi)+abs(now-mi)
    val1=abs(ma)+abs(now-ma)
    val=max(val0,val1)+rui[j+1]
    ans=max(ans,val)
    ma=max(ma,now)
    mi=min(mi,now)
  print(ans)