Usando Deque para hacer una lista
python
from collections import deque
def check(d):
while d:
big = d.popleft() if d[0]>d[-1] else d.pop()
if not d:
return "Yes"
if d[-1]>big or d[0]>big:
return "No"
for i in range(int(input())):
int(input())
d = deque(map(int,input().split()))
print(check(d))
Claude Spivey