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Connect Same Level Siblings of a Binary Tree

Explore how to connect siblings at the same level in a binary tree by using next pointers. This lesson teaches a level-order traversal approach that links all nodes horizontally with constant space and linear time complexity. Understand the algorithm step-by-step to efficiently handle node connections across tree levels.

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Statement

Given a binary tree, connect all nodes at the same hierarchical level. We need to connect them from left to right, such that the next pointer of each node points to the node on its immediate right. The next pointer of the right-most node at each level will be NULL.

For this problem, each node in the binary tree has one additional pointer (the next pointer), along with the left and right pointers.

Example

Let’s consider the following binary tree as an example:

G root 100 node1 50 root->node1 node2 200 root->node2 node3 25 node1->node3 node4 75 node1->node4 node5 125 node2->node5 node6 300 node2->node6 node7 10 node3->node7 node9 15 node8 350 node6->node8 node7->node9
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