import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n = ii()
w = mii()
h = mii()
ans = 0
ans += sum(w) * 2 + h[0] + h[-1]
for i in range(1, n):
ans += abs(h[i] - h[i - 1])
p(ans)
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
solve()