t03贪心算法_摆动序列

Sub 摆动序列()
    'Dim nums(0 To 6)
    nums = Array(1, 17, 5, 10, 13, 15, 10, 5, 16, 8)
'    nums = Array(1, 2, 3, 4, 5, 6, 7, 8, 9)
'    nums = Array(1, 7, 4, 9, 2, 5)
    Debug.Print (wiggleMaxLength(nums))
End Sub

Function wiggleMaxLength(nums)
    If UBound(nums) <= 1 Then
        wiggleMaxLength = UBound(nums)
    End If
    Dim curDiff: curDiff = 0
    Dim preDiff: preDiff = 0
    Dim count: count = 1
    For i = 1 To UBound(nums)
        curDiff = nums(i) - nums(i - 1)
        If ((curDiff > 0 And preDiff <= 0) Or (curDiff < 0 And preDiff >= 0)) Then
            count = count + 1
            preDiff = curDiff
        End If
    Next
    wiggleMaxLength = count
End Function