leetcode376

 1 class Solution:
 2     def wiggleMaxLength(self, nums: List[int]) -> int:
 3         n = len(nums)
 4         if n == 0:
 5             return 0
 6         up,down = 1,1
 7         for i in range(1,n):
 8             if nums[i] > nums[i-1]:
 9                 up = down + 1
10             elif nums[i] < nums[i-1]:
11                 down = up + 1
12         return max(up,down)