Grokking the Coding Interview: Patterns for Coding Questions
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Problem Challenge 1: Connect All Level Order Siblings (medium)

Problem Statement

Given a binary tree, connect each node with its level order successor. The last node of each level should point to the first node of the next level.

Constraints:

  • The number of nodes in the tree is in the range [0, 2<sup>12</sup> - 1].
  • -1000 <= Node.val <= 1000

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