[LeetCode] 1123. Lowest Common Ancestor of Deepest Leaves 最深叶结点的最小公共父节点

Posted 2022-08-16 grandyang

Given a rooted 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 no children
• The?depth?of the root of the tree is 0, and if the depth of a node is?d, the depth of each of its children?is?d+1.
• The?lowest common ancestor?of a set?Sof nodes is the node?A?with the largest depth such that every node in S is in the subtree with root?A.

Example 1:

Input: root = [1,2,3]
Output: [1,2,3]
Explanation:
The deepest leaves are the nodes with values 2 and 3.
The lowest common ancestor of these leaves is the node with value 1.
The answer returned is a TreeNode object (not an array) with serialization "[1,2,3]".

Example 2:

Input: root = [1,2,3,4]
Output: [4]

Example 3:

Input: root = [1,2,3,4,5]
Output: [2,4,5]

Constraints:

• The given tree will have between 1 and 1000 nodes.
• Each node of the tree will have a distinct value between 1 and 1000.

Github 同步地址:

https://github.com/grandyang/leetcode/issues/1123

类似题目：

Lowest Common Ancestor of a Binary Tree

Lowest Common Ancestor of a Binary Search Tree

参考资料：

https://leetcode.com/problems/lowest-common-ancestor-of-deepest-leaves/

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