LeetCode 608: Tree Node Solution

Master LeetCode problem 608 (Tree Node), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

608. Tree Node

Medium

Database

Problem Explanation

Explanation:

To solve this problem, we can use a SQL query to determine the type of each node in the tree based on whether the node is a root, an inner node, or a leaf node.

For each node in the tree, we can check if it is a root node by verifying if its parent id is null.
If a node is not a root node, we can check if it is an inner node by verifying if it has a parent node and at least one child node.
If a node is neither a root nor an inner node, then it must be a leaf node.

Solution Code

# Write your Java solution here
SELECT id,
    CASE
        WHEN p_id IS NULL THEN 'Root'
        WHEN id IN (SELECT DISTINCT p_id FROM Tree) THEN 'Inner'
        ELSE 'Leaf'
    END AS type
FROM Tree

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