class Solution:
def removeElement(self, nums: List[int], val: int) -> int:
lens = len(nums)
start = 0
stop = lens - 1
while(start <= stop): #=號保證了當所有數字全一致時交換時的正確性
if nums[start] == val:
nums[start] = nums[stop]
stop -= 1
else:
start += 1
return stop + 1
這種方法非常好用,速度非常快,秒殺pop方法