[LeetCode] 26. Remove Duplicates from Sorted Array

Python

class Solution:
    def removeDuplicates(self, nums: List[int]) -> int:
        before = 0
        for current in range(1, len(nums)):
            if nums[current] != nums[before]:
                before += 1
                nums[before] = nums[current]
        
        return before + 1