26. Remove Duplicates from Sorted Arrayl

class Solution:
    def removeDuplicates(self, nums: List[int]) -> int:
        # d=[]
        # seen=set()
        # for i in nums:
        #     if(i in seen):
        #         d.append(i)
        #     seen.add(i)
        # nums[:]=seen

        seen=set()
        index=0
        for i in nums:
            if i not in seen:
                seen.add(i)
                nums[index]=i
                index+=1
        return index