leetcode 27. 移除元素

一个指针遍历数组，遇到指定数字删掉

class Solution:
    def removeElement(self, nums: List[int], val: int) -> int:
        i = 0
        while i < len(nums):
            if nums[i] == val:
                nums.pop(i)
                i -= 1
            i += 1
        return len(nums)