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...
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 ...
=nil{returnroot}// Otherwise, LCA is either in left subtree or right subtreeifleftLCA!=nil{returnleftLCA}returnrightLCA}funcmain(){// Example usage:// Construct a binary tree// 3// / \// 5 1// / \ / \// 6 2 0 8// / \// 7 4root:=&TreeNode{Val:3}root.Left=&TreeNode...
File metadata and controls Code Blame 52 lines (45 loc) · 1.53 KB Raw package tree; /** * Created by gouthamvidyapradhan on 21/03/2017. * Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. * <p> * According to the definition of LCA on...
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 ...
题目描述 首先这个的前提条件是二叉搜索树: 对于二叉搜索树就是 二叉查找树(Binary Search Tree),(又:二叉搜索树,二叉排序树)它或者是一棵空树,或者是具有下列性质的二叉树: 若它的左子树不空,则左子树上所有结点的值均小于它的根结点的值; 若它的右子树不空,则右子树上所有结点的值均大于它的根结点的值; ...
binary search tree.19* @param A: A TreeNode in a Binary.20* @param B: A TreeNode in a Binary.21* @return: Return the least common ancestor(LCA) of the two nodes.22*/23TreeNode * lowestCommonAncestor(TreeNode * root, TreeNode * A, TreeNode *B) {24//write your code here25/...
參考:http://www.geeksforgeeks.org/lowest-common-ancestor-in-a-binary-search-tree/ #include <stdio.h> #include <stdlib.h> class LCABST { struct Node { int data; Node *left, *right; Node(int d) : data(d), left(NULL), right(NULL) {} ...
Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST. According to thedefinition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that has both v and w as descendants (wh...
Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST. According to thedefinition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that has both v and w as descendants (wh...