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LeetCode-Solutions/Python/valid-mountain-array.py at master · tehsints/LeetCode-Solutions · GitHub
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valid-mountain-array.py
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LeetCode-Solutions
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Python
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valid-mountain-array.py
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# Time: O(n)
# Space: O(1)
class
Solution
(
object
):
def
validMountainArray
(
self
,
A
):
"""
:type A: List[int]
:rtype: bool
"""
i
=
0
while
i
+
1
<
len
(
A
)
and
A
[
i
]
<
A
[
i
+
1
]:
i
+=
1
j
=
len
(
A
)
-
1
while
j
-
1
>=
0
and
A
[
j
-
1
]
>
A
[
j
]:
j
-=
1
return
0
<
i
==
j
<
len
(
A
)
-
1
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