Maximum Difference Between Increasing Elements LeetCode solution in Python

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class Solution:
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    def maximumDifference(self, nums: List[int]) -> int:
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        curmin = nums[0]
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        diff = 0
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        for num in nums:
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            diff = max(diff, num - curmin)
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            curmin = min(curmin, num)
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        return diff or -1