leetcode376

class Solution:
    def wiggleMaxLength(self, nums: List[int]) -> int:
        n = len(nums)
        if n == 0:
            return 0
        up,down = 1,1
        for i in range(1,n):
            if nums[i] > nums[i-1]:
                up = down + 1
            elif nums[i] < nums[i-1]:
                down = up + 1
        return max(up,down)