Problem: Connect All Siblings of a Binary Tree

med

30 min

Understand how to connect each node in a perfect binary tree to its next sibling node from left to right using a breadth-first search approach. Explore the use of additional pointers to link nodes efficiently at each level and learn to implement an optimal O(n) time and O(1) space solution.

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 each node to the next node from left to right. For nodes that have a right sibling, next points to that sibling. For the rightmost node of each level, next points to the first node of the next level. The rightmost node of the final level points to NULL.

Constraints:

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

Connect All Siblings of a Binary Tree

Which node will the next pointer of node $5$ be pointing toward after connecting all the siblings in the given tree?

         _______ 1 _______
        |                  |
     __ 2 _             __ 3__
    |       |          |       |
   _4_    _ 5 _      - 6 -    --7--
  |   |  |     |    |     |  |     |
  8   9  10    11  12    13  14    15

1 / 4

Problem: Connect All Siblings of a Binary Tree

med

30 min

Statement

Constraints:

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

Connect All Siblings of a Binary Tree

Which node will the next pointer of node $5$ be pointing toward after connecting all the siblings in the given tree?

         _______ 1 _______
        |                  |
     __ 2 _             __ 3__
    |       |          |       |
   _4_    _ 5 _      - 6 -    --7--
  |   |  |     |    |     |  |     |
  8   9  10    11  12    13  14    15

1 / 4

Problem: Connect All Siblings of a Binary Tree

Statement

Examples

Understand the problem

Figure it out!

Try it yourself

Problem: Connect All Siblings of a Binary Tree

Statement

Examples

Understand the problem

Figure it out!

Try it yourself