# -*- coding:utf-8 -*-
class Solution:
    def VerifySquenceOfBST(self, sequence):
        # write code here
        if sequence==None or len(sequence)==0:
            return False
        length=len(sequence)
        root=sequence[length-1]
        for i in range(length):
            if sequence[i]>root:
                break
        for j in range(i,length):
            if sequence[j]<root:
                return False
        left=True
        if i > 0:
            left=self.VerifySquenceOfBST(sequence[0:i])
        right=True
        if  i<length-1:
            right=self.VerifySquenceOfBST(sequence[i:-1])
        return right and left