#Fahmidur Rahman Nafi 62(i)
t = int(input())
for i in range(t):
    n = int(input())
    lst = list(map(int, input().split()))
    x = set(lst)
    l = len(x)
    perm = True

    if l == n:
        sorted_x = sorted(x)
        for j in range(l - 1):
            if sorted_x[j] + 1 != sorted_x[j + 1]:
                perm = False
                break
    else:
        perm = False

    if perm:
        print("YES")
    else:
        print("NO")