26. 删除排序数组中的重复项

#### class Solution:
    def removeDuplicates(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        if len(nums) == 0 :
            return 0
        i = 0
        for j in range(1,len(nums)):
            if nums[j]!= nums[i]:
                i = i +1
                nums[i] = nums[j]
        return i +1