#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
#
# @param nums int整型一维数组
# @return int整型
#
class Solution:
    def reArrangeArray(self, nums: List[int]) -> int:
        # write code here
        if not nums:
            return 0
        slow = 0
        for fast in range(1,len(nums)):
            if nums[slow]!=nums[fast]:
                slow += 1
                nums[slow] = nums[fast]
        return slow+1