All of the nodes' values will be unique. p and q are different and both values will exist in the binary tree. 解题思路: 只要熟悉树的遍历,应该都可以迅速完成该题。 关键点: 如果在 node 的左子树没找到与 p,q 相等的结点,递归函数返回null,公共祖先在右侧结点 如果在 node 的右子树没找到与 p,...
* }*/classSolution {public:/** @param root: The root of the binary search tree. * @param A: A TreeNode in a Binary. * @param B: A TreeNode in a Binary. * @return: Return the least common ancestor(LCA) of the two nodes.*/TreeNode* lowestCommonAncestor(TreeNode * root, TreeN...
Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. 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 (where we allow ...
https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/ 这里是BT不是BST,思路就是找到root到p和q的path然后找到最后的一个交点。要注意如何find Path。 如何用递归 http://bookshadow.com/weblog/2015/07/13/leetcode-lowest-common-ancestor-binary-tree/ 思路1 findPath。。。用post-orde...
Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST. 这题怎么说呢,思路还是蛮清晰的, 引用一下别人的分析: 在二叉查找树种,寻找两个节点的最低公共祖先。 1、如果a、b都比根节点小,则在左子树中递归查找公共节点。
Explanation: The LCA of nodes 5 and 4 is 5, since a node can be a descendant of itself according to the LCA definition. Note: All of the nodes’ values will be unique. p and q are different and both values will exist in the binary tree. ...
public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) { if (root == null) { return root; } if (root.val > Math.max(p.val, q.val)) { return lowestCommonAncestor(root.left, p, q); } else if (root.val < Math.min(p.val, q.val)) { ...
Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. “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 (where we allowa node to be a descendant of itself).” ...
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 the root and two nodes in a Binary Tree. Find the lowest common ancestor(LCA) of the two nodes. The lowest common ancestor is the node with largest depth which is the ancestor of both nodes. Example For the following binary tree: ...