[LeetCode] 162. Find Peak Element(852. Peak Index in a Mountain Array)_Medium tag: Binary Search [LeetCode] 74. Search a 2D Matrix_Medium tag: Binary Search [LeetCode] 240. Search a 2D Matrix II_Medium tag: Binary Search [LeetCode] 69. Sqrt(x)_Easy tag: Binary Search [LeetCode]...
http://www.programcreek.com/2014/06/leetcode-count-complete-tree-nodes-java/ 1defgetLeftMostHeight(root):2depthLeft =03while(root):4root =root.left5depthLeft += 16returndepthLeft789defgetRightMostHeight(root):10depthRight =011while(root):12root =root.right13depthRight += 114returndepthRight...
Leetcode class Solution: def searchBST(self, root: TreeNode, val: int) -> TreeNode: ## 方法一:for cur = root while cur: if cur.val == val: return cur cur = cur.left if cur.val > val else cur.right return None ## 方法二:递归 if not root: return None if root.val == val...
The inorder traverse of tree could be done iteratively. So that we do not have to make recursive call. 1publicclassSolution {2publicvoidrecoverTree(TreeNode root) {3TreeNode n1 =null, n2 =null;4TreeNode prev =newTreeNode(Integer.MIN_VALUE);5TreeNode current =root;6Stack<TreeNode> stack...
初看推导公式,很容易的想到的是递归解法。我也是采用的这种方式。 为了避免重复计算,使用了map来缓存已计算过的值。 js代码如下: varnumTrees=function(n){// 预设值letmap=newMap()map.set(0,1)map.set(1,1)map.set(2,2)map.set(3,5)const result=recursive(n,map)returnresult};// 89.50%varrecursi...
1. Description Insert into a Binary Search Tree 2. Solution Iterative /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} ...
94. 二叉树的中序遍历 - 给定一个二叉树的根节点 root ,返回 它的 中序 遍历 。 示例 1: [https://assets.leetcode.com/uploads/2020/09/15/inorder_1.jpg] 输入:root = [1,null,2,3] 输出:[1,3,2] 示例 2: 输入:root = [] 输出:[] 示例 3: 输入:ro
利用这个性质,可以迭代(iterative)或递归(recursive)地用O(lgN)的时间复杂度在二叉查找树中进行值查找。 相关LeetCode题: 700. Search in a Binary Search Tree 题解 701. Insert into a Binary Search Tree 题解 450. Delete Node in a BST 题解 776. Split BST 题解 二叉查找树与有序序列 由性质可知,...
LeetCode_Lowest Common Ancestor of a Binary Search Tree (Binary Tree) Lowest Common Ancestor of a Binary Search Tree 一.题目描写叙述 二.思路及代码 二叉搜索树有个性质:左子树的值都比根节点小,右子树的值比根节点大.那么我 ...随机推荐Sql
LeetCode—105. Construct Binary Tree from Preorder and Inorder Traversal LeetCode—105. Construct Binary Tree from Preorder and Inorder Traversal 题目 根据前序遍历和中序遍历建立二叉树。注意二叉树中没有重复的数字。 思路及解法 根据前序遍历和中序遍历的特点,通过前序遍历列表确定根节点,在中序遍历...