image.png For example, the lowest common ancestor (LCA) of nodes 2 and 8 is 6. Another example is LCA of nodes 2 and 4 is 2, since a node can be a descendant of itself according to the LCA definition. 大意: 给出一个二叉查找树(BST),在其中找到给出的两个节点的最低的共同祖先(LCA)...
要想为true,要么左树或右树含p或q,要么当前节点是p或q return inl or inr or root == p or root == q def lowestCommonAncestor(self, root: TreeNode, p: TreeNode, q: TreeNode) -> TreeNode: if not root: return None # 注意python的实例变量必须定义在方法中 self.res = None self.dfs(...
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...
*/classSolution{publicTreeNodelowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q){if(root==null||root==p||root==q){returnroot; } TreeNode l=lowestCommonAncestor(root.left,p,q); TreeNode r=lowestCommonAncestor(root.right,p,q);if(l!=null&&r!=null){returnroot; }if(l==null)...
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 p and q as the lowest node in T that has both p and q as descendants (wher...
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 nodespandqas the lowest node inTthat has bothpandqas descendants (where we allowa node to be a ...
classSolution{publicTreeNodelowestCommonAncestor(TreeNode root,TreeNode p,TreeNode q){if(root ==null|| root == p || root == q)returnnull;TreeNodeln= lowestCommonAncestor(root.left, p, q);TreeNodern= lowestCommonAncestor(root.right, p, q);return(ln !=null&& rn !=null)? root :(ln...
Can you solve this real interview question? Lowest Common Ancestor of Deepest Leaves - Given the root of a binary tree, return the lowest common ancestor of its deepest leaves. Recall that: * The node of a binary tree is a leaf if and only if it has n
leetcode--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 bet......
Lowest Common Ancestor of a Binary Tree 根据LCA的定义,二叉树中最小公共祖先就是两个节点p和q最近的共同祖先节点,LCA的定义没什么好解释的,主要是这道题的解法。 我们要找p和q的最小公共节点,我开始想到的方法是先找出root分别到p和q的路径,既然路径都知道了,就从两条路径的末尾倒着往前来,第一个共同...