leetcode-algorithms/python/valid_mountain_array.py at master · anishLearnsToCode/leetcode-algorithms · GitHub

16 lines (14 loc) · 559 Bytes

from typing import List

class Solution:

def validMountainArray(self, numbers: List[int]) -> bool:

isIncreasing = True

index = 1

while index < len(numbers):

if numbers[index] == numbers[index - 1]: return False

if numbers[index] < numbers[index - 1] and isIncreasing:

if index == 1: return False

isIncreasing = False

if numbers[index] > numbers[index - 1] and not isIncreasing:

return False

index += 1

return not isIncreasing

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