Minimum Increment to Make Array Unique LeetCode solution in Python

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class Solution:
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    def minIncrementForUnique(self, nums: List[int]) -> int:
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        nums.sort()
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        c = 0
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        i = 1
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        num = []
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        while i < len(nums):
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            if nums[i] <= nums[i - 1]:
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                a = nums[i - 1] + 1
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                c += a - nums[i]
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                nums[i] = a
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            i += 1
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        return c