```
class Solution(object):
def wiggleMaxLength(self, nums):
"""
:type nums: List[int]
:rtype: int
"""
if not nums:
return 0
return max(self.count(1, nums), self.count(-1,nums))
def count(self, flag, nums):
_tmp=nums[0]
cnt=1
for i in range(1,len(nums)):
if flag==1:
if nums[i]<=_tmp:
_tmp=nums[i]
else:
flag=-1
cnt+=1
_tmp=nums[i]
else:
if nums[i]>=_tmp:
_tmp=nums[i]
else:
flag=1
cnt+=1
_tmp=nums[i]
return cnt
```