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Grokking the Coding Interview Patterns in Python

Solution: Populating Next Right Pointers in Each Node

Discover how to connect the next pointers of nodes at the same level in a perfect binary tree. Learn both naive and optimized breadth-first search methods, understand their time and space complexities, and practice traversing tree levels without extra data structures.

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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
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