Connect All Siblings of a Binary Tree

Understand how to connect all sibling nodes of a perfect binary tree using breadth-first search techniques. This lesson teaches you to use a next pointer to link nodes left to right and across tree levels, improving your grasp of tree traversal and manipulation for coding interviews.

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Statement

Given the root of 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 is equipped with an additional pointer, next, connect all nodes from left to right. Do so in such a way that the next pointer of each node points to its immediate right sibling except for the rightmost node, which points to the first node of the next level.

The next pointer of the last node of the binary tree (i.e., the rightmost node of the last level) should be set to NULL.

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