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Grokking the Coding Interview Patterns in Go

Solution: Populating Next Right Pointers in Each Node

Explore how to connect each node's next pointer to its immediate right node in a perfect binary tree without using extra space. Understand both the naive queue-based approach and an optimized in-place breadth-first search method. This lesson helps you grasp tradeoffs in time and space complexity while mastering tree traversal patterns important for coding interviews.

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Statement

Given a perfect binary treeA binary tree in which all the levels are completely filled with nodes, and all leaf nodes (nodes with no children) are at the same level., where each node contains an additional pointer called next. This pointer is initially set to NULL for all nodes. Your task is to connect all nodes of the same hierarchical level by setting the next pointer to its immediate right node.

The next pointer of the rightmost node at each level is set to NULL.

Constraints:

  • The number of nodes in the tree is in the range [0,500][0, 500].
  • −1000≤-1000 \leq Node.data ≤1000\leq 1000

Solution

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