Count Hills and Valleys in an Array LeetCode solution in Python

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class Solution:
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    def countHillValley(self, nums: List[int]) -> int:
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        c = 0
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        i = 1
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        while i < len(nums) - 1:
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            j = i + 1
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            while j < len(nums) - 1 and nums[j] == nums[i]:
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                j += 1
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            if (nums[i - 1] > nums[i] and nums[j] > nums[i]) or (
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                nums[i - 1] < nums[i] and nums[j] < nums[i]
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            ):
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                c += 1
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            i = j
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        return c