Leetcode Problem 2196. Create Binary Tree From Descriptions

2196. Create Binary Tree From Descriptions

Leetcode Solutions

HashMap and HashSet Approach

  1. Initialize a HashMap nodes to map integer values to TreeNode objects.
  2. Initialize a HashSet children to keep track of all child node values.
  3. Iterate over each description in descriptions. a. Retrieve or create the TreeNode for the parent. b. Retrieve or create the TreeNode for the child. c. Link the parent and child nodes according to isLeft. d. Add the child node value to children.
  4. Find the root by looking for a node value in nodes that is not in children.
  5. Return the TreeNode associated with the root value.
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