Grokking Tree Coding Patterns for Interviews
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Create Binary Tree From Descriptions (medium)
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Problem Statement

You are given a 2D list called descriptions. Each element in descriptions represents a relationship in a binary tree. The element descriptions[i] = [parent<sub>i</sub>, child<sub>i</sub>, isLeft<sub>i</sub>] tells us that parent<sub>i</sub> is the paent of child<sub>i</sub>. The isLeft<sub>i</sub> value can be either 1 or 0:

  • If isLeft<sub>i</sub> is 1, childi is the left child of parent<sub>i</sub>.
  • If isLeft<sub>i</sub> is 0, child<sub>i</sub> is the right child of parent<sub>i</sub>.

Build this binary tree from the given description and return its root node

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