How to Solve Lowest Common Ancestor of Deepest Leaves Problem
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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 no children The depth of the root of th...
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Understanding the Lowest Common Ancestor of Deepest Leaves Problem
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Problem Statement
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 no children The depth of the root of the tree is 0. 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 S of nodes, is the node A with the largest depth such that every node in S is in the subtree with root A.
Lowest Common Ancestor of Deepest Leaves
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Examples
root = [3,5,1,6,2,0,8,null,null,7,4][2,7,4]We return the node with value 2, colored in yellow in the diagram. The nodes coloured in blue are the deepest leaf-nodes of the tree. Note that nodes 6, 0, and 8 are also leaf nodes, but the depth of them is 2, but the depth of nodes 7 and 4 is 3.
root = [1][1]The root is the deepest node in the tree, and it's the lca of itself.
root = [0,1,3,null,2][2]The deepest leaf node in the tree is 2, the lca of one node is itself.
Constraints
The number of nodes in the tree will be in the range [1, 1000].0 <= Node.val <= 1000The values of the nodes in the tree are unique.How Interview Coder Helps with Leetcode Problems
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