给一棵二叉排序树,找p和q的LCA。 思路: 给的是BST(无相同节点),那么每个节点肯定大于左子树中的最大,小于右子树种的最小。根据这个特性,找LCA就简单多了。 分三种情况: (1)p和q都在root左边,那么往root左子树递归。 (2)在右同理。 (3)一左一右的,那么root->val肯定大于其中的1个,小于另一个。 AC...
对于二叉搜索树,还可以进行优化,通过权值大小比对可以确定p,q相对root的位置,如果p,q分别在root的两侧,则root就是最近公共祖先。 题目链接:https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-search-tree/submissions/ 递归法: varlowestCommonAncestor =function(root, p, q) {if(!root ||...
AI代码解释 packagemainimport"fmt"typeTreeNodestruct{ValintLeft*TreeNode Right*TreeNode}funclowestCommonAncestor(root,A,B*TreeNode)*TreeNode{// Base case: if root is nil or equal to A or B, return rootifroot==nil||root==A||root==B{returnroot}// Recursively search left and right subt...
题目: Given the root of a binary search tree and the lowest and highest boundaries as low and high, trim the tree so that all its elements lies in [low, high]. Trimming the... 【LeetCode】979. Distribute Coins in Binary Tree 解题报告(C++) ...
A binary search tree (BST) is recursively defined as a binary tree which has t...PAT甲级-1151 LCA in a Binary Tree The lowest common ancestor (LCA) of two nodes U and V in a tree is the deepest node that has both U and V as descendants. Given any two nodes in a binary tree...
PAT 1051.LCA in a Binary Tree(30) The lowest common ancestor (LCA) of two nodes U and V in a tree is the deepest node that has both U and V as descendants. Given any two nodes in a binary tree, you are supposed to find their LCA. 输入格式: Each input file contains one test ...
LCA LeetCode 235 题目链接:https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/ 题目代码: classSolution {public: TreeNode* lowestCommonAncestor(TreeNode* root, TreeNode* p, TreeNode*q) { TreeNode*cur =root;while(1) {if(p -> val < cur -> val && q -> val...
Problem I: Lowest Common Ancestor of a Binary Search Tree Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST. According to the definition of LCA on Wikipedia:“The lowest common ancestor is defined between two nodes v and w as the ...
binary_search bit_manipulation breadth_first_search depth_first_search design divide_and_conquer dynamic_programming greedy hashing heap linked_list math stack string tree BinarayTreeRightSideView.java BinaryTreeInorderTraversal.java BinaryTreeMaximumPathSum.java BoundaryOfBinaryTree.java ClosestBinarySearchT...
暴力做法直接暴力搜索参考: https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree/https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-search-tree/普通搜索每次查询都…