# Definition for a binary tree node.# class TreeNode(object):# def __init__(self, x):# self.val = x# self.left = None# self.right = NoneclassSolution(object):deflowestCommonAncestor(self,root,p,q):""":type root: TreeNode:type p: TreeNode:type q: TreeNode:rtype: TreeNode""...
#Definition for a binary tree node#class TreeNode(object):#def __init__(self, x):#self.val = x#self.left = None#self.right = NoneclassBSTIterator(object):def__init__(self, root):""":type root: TreeNode"""self.stack=[] self.pushLeft(root)defhasNext(self):""":rtype: bool""...
二叉树 Python3代码 # Definition for a binary tree node.# class TreeNode:# def __init__(self, x):# self.val = x# self.left = None# self.right = NoneclassSolution:defsearchBST(self, root: TreeNode, val:int) -> TreeNode:# 节点不存在ifnotroot:returnNoneifroot.val == val:returnr...
代码(Python3) # Definition for a binary tree node. # class TreeNode: # def __init__(self, val=0, left=None, right=None): # self.val = val # self.left = left # self.right = right class Solution: def searchBST(self, root: Optional[TreeNode], val: int) -> Optional[TreeNode...
:type root: TreeNode :rtype: bool """ if not root: return True # if not root.left or not root.right: # return True inorder = [] self.inorderTraversal(root, inorder) for i in range(len(inorder)-1): if inorder[i] >= inorder[i+1]: ...
append(None) return result for i in range(start, end + 1): # generate left and right sub tree leftTree = self.helper(start, i - 1) rightTree = self.helper(i + 1, end) # link left and right sub tree to root(i) for j in range(len(leftTree)): for k in range(len(right...
Step 1: Define the Binary Tree Firstly, we need to create the binary tree structure. Here, we’ll define a simple Node class: class Node: def __init__(self, data): self.data = data self.left = None self.right = None This class represents a node in the binary tree, which contains...
Python: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 classSolution:defsearchBST(self,root:TreeNode,val:int)->TreeNode:ifnot root:returnNoneifval==root.val:returnrootifval>root.val:returnself.searchBST(root.right,val)else:returnself.searchBST(root.left,val) ...
Python Java C C++ # Binary Search in pythondefbinarySearch(array, x, low, high):ifhigh >= low: mid = low + (high - low)//2# If found at mid, then return itifx == array[mid]:returnmid# Search the right halfelifx > array[mid]:returnbinarySearch(array, x, mid +1, high)# Se...
Python 代码语言:javascript 代码运行次数:0 运行 AI代码解释 classBSTIterator:def__init__(self,root:TreeNode):self.stack=[]self._left_inorder(root)def_left_inorder(self,node:TreeNode):whilenode:self.stack.append(node)node=node.left defnext(self)->int:""" ...