import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
inf = 10 ** 18
inf = float("inf")
for _ in range(ni()):
    n = ni()
    a = na()

    dp = [[-inf, -inf] * 2 for i in range(3)]
    dp[0][0] = 0
    dp[0][1] = 0

    for t in range(n):
        ndp = [[-inf, -inf] * 2 for i in range(3)]

        for i in range(3):
            for j in range(2):
                ndp[i][j] = dp[i][j] + (a[t] if j else -a[t])
        
        for i in range(1, -1, -1):
            for j in range(2):
                if ndp[i][j] != -inf:
                    ndp[i+1][j] = max(ndp[i+1][j], ndp[i][j])
                if ndp[i][j^1] != -inf:
                    ndp[i+1][j] = max(ndp[i+1][j], ndp[i][j^1])
        dp = ndp
        # print(dp)

    print(max(dp[2]))