import collections
import heapq
import sys
from collections import defaultdict
from itertools import count, accumulate, pairwise, groupby

sys.setrecursionlimit(10 ** 6)
from typing import List, Tuple

int1 = lambda x: int(x) - 1
input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    t = ii()

    def ok(arr):
        def sgn(x): return 1 if x > 0 else -1

        z = (sgn(a - b) for a, b in pairwise(arr))
        arr = [v[0] for v in groupby(z)]
        return arr == [1, -1, 1, -1]

    for _ in range(t):
        input()
        print('Yes' if ok(vi()) else 'No')


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()