随笔分类 - 树
摘要:BFS模板的应用。 总结的DFS、BFS模板参考:https://www.cnblogs.com/panweiwei/p/13065661.html 注:"/"符号两边只要有一个float类型,结果自动取float类型!!! class Solution(object): def averageOf
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摘要:方法一:递归。 class Solution(object): # 递归 def mergeTrees(self, t1, t2): """ :type t1: TreeNode :type t2: TreeNode :rtype: TreeNode """ if not t1 and not t2
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摘要:方法一:BFS模板的应用。 总结的DFS、BFS模板参考:https://www.cnblogs.com/panweiwei/p/13065661.html class Solution(object): def maxDepth(self, root): """ :type root: Node
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摘要:BFS模板的应用。 总结的DFS、BFS模板参考:https://www.cnblogs.com/panweiwei/p/13065661.html class Solution(object): def largestValues(self, root): """ :type root: Tree
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摘要:方法一:BFS模板的应用。 总结的DFS、BFS模板参考:https://www.cnblogs.com/panweiwei/p/13065661.html class Solution(object): # BFS def findBottomLeftValue(self, root): """
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摘要:类似题目参考:https://www.cnblogs.com/panweiwei/p/13065661.html class Solution(object): # 先特判: # 当节点root为空时:return None; # 当p或q的值域等于root时,return root; # 再递归判
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摘要:方法一:BFS模板的应用。 总结的DFS、BFS模板参考:https://www.cnblogs.com/panweiwei/p/13065661.html class Solution(object): # BFS def kthSmallest(self, root, k): """ :type
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摘要:BFS模板的应用 总结的DFS、BFS模板参考:https://www.cnblogs.com/panweiwei/p/13065661.html class Solution(object): def connect(self, root): """ :type root: Node :rtype
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摘要:输入: {"$id":"1","left":{"$id":"2","left":{"$id":"3","left":null,"next":null,"right":null,"val":4},"next":null,"right":{"$id":"4","left&q
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摘要:BFS模板的应用。 总结的DFS、BFS模板参考:https://www.cnblogs.com/panweiwei/p/13065661.html class Solution(object): def minDepth(self, root): """ :type root: TreeNode
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摘要:class Solution(object): # 题意要转成平衡二叉搜索树 # 先转成list,在转BST呗。 def sortedListToBST(self, head): """ :type head: ListNode :rtype: TreeNode """ if not head: r
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摘要:方法一:递归 class Solution(object): # 递归思路: # 当p,q都在root的右子树中时,递归root.right并返回; # 当p,q都在root的左子树中时,递归root.left并返回; # 返回值:最近公共祖先root。 def lowestCommonAncest
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摘要:# Definition for singly-linked list. class ListNode(object): def __init__(self, x): self.val = x self.next = None # Definition for a binary tree node.
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摘要:class Solution(object): def constructMaximumBinaryTree(self, nums): """ :type nums: List[int] :rtype: TreeNode """ if not nums: return rootval = max(n
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摘要:# Definition for a Node. class Node(object): def __init__(self, val=None, children=None): self.val = val self.children = children 方法一:迭代 class Solutio
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摘要:方法一:迭代 class Solution(object): # 迭代 def preorder(self, root): """ :type root: Node :rtype: List[int] """ res = [] if not root: return res stack = [roo
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摘要:class Solution(object): def pathSum(self, root, target): """ :type root: TreeNode :type sumt: int :rtype: int """ self.count = 0 myDict = {0: 1} def d
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摘要:class Solution(object): def levelOrder(self, root): """ :type root: Node :rtype: List[List[int]] """ if not root: return [] ans = [] self.dfs(1, root,
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摘要:class Solution(object): def sumOfLeftLeaves(self, root): """ :type root: TreeNode :rtype: int """ if not root or (not root.left and not root.right): r
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摘要:类似题:https://www.cnblogs.com/panweiwei/p/13585987.html class Solution(object): def lowestCommonAncestor(self, root, p, q): """ :type root: TreeNode :ty
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