import sys, random
input = lambda : sys.stdin.readline().rstrip()


write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO); INF=10**18
LI = lambda : list(map(int, input().split())); II=lambda : int(input()); SI=lambda : [ord(c)-ord("a") for c in input()]
def debug(_l_):
    for s in _l_.split():
        print(f"{s}={eval(s)}", end=" ")
    print()
def dlist(*l, fill=0):
    if len(l)==1:
        return [fill]*l[0]
    ll = l[1:]
    return [dlist(*ll, fill=fill) for _ in range(l[0])]

def runlength(s):
    if not s:
        return []
    c = s[0]
    v = 1
    n = len(s)
    l = []
    for i in range(1, n):
        if c==s[i]:
            v += 1
        else:
            l.append((c,v))
            c = s[i]
            v = 1
    l.append((c,v))
    return l

t = II()
for _ in range(t):
    n = int(input())
    a = list(map(int, input().split()))
    res = runlength(a)
    if len(res)%2==0:
        ans = 1
    elif any((res[i][1]>=2 for i in range(1,len(res),2))):
        ans = 1
    else:
        ans = 0
    pans(ans)