Leetcode Problem 608. Tree Node

608. Tree Node

Leetcode Solutions

Classifying Tree Nodes as Root, Inner, or Leaf

Select the node as 'Root' if its p_id is NULL.
Select the node as 'Leaf' if its id is not present in any p_id (indicating it has no children) and it has a p_id (indicating it has a parent).
Select the node as 'Inner' if its id is present in any p_id (indicating it has children) and it has a p_id (indicating it has a parent).
Combine the results using the UNION operator and sort by id.

erDiagram
    Tree {
        int id PK "Unique node identifier"
        int p_id FK "Parent node identifier"
    }

Classifying Tree Nodes Using Conditional Logic

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