Minimum increment to make array unique

We will sort the array and iterate over the array. If the current element is smaller than the previous element, we will increment the current element to the previous element plus one.

class Solution:
    def minIncrementForUnique(self, nums: List[int]) -> int:
        nums.sort()
        res = 0
        for i in range(1, len(nums)):
            if nums[i] <= nums[i-1]:
                res += nums[i-1] - nums[i] + 1
                nums[i] = nums[i-1] + 1
        return res

Time complexity: O(nlog(n))
Space complexity: O(1)