0027-remove-element.py

class Solution:
    def removeElement(self, nums: List[int], val: int) -> int:
        i, j = 0, 0 
        n = len(nums) 

        while i < n: 
            if nums[i] != val: 
                nums[j] = nums[i] 
                j += 1  
            i += 1  

        return j