Update 102. Binary Tree Level Order Traversal - BFS.cpp

[Starlaps-365]

Given the root of a binary tree, return the level order traversal of its nodes' values. The level order traversal should be from left to right, level by level. Therefore to perform a level order traversal of a binary tree, we can utilize a queue to keep track of nodes at each level. We start by pushing the root node into the queue. Then, we iterate through the queue, processing nodes level by level.

[Starlaps-365]

In this implementation, we maintain a queue to process nodes level by level. We iterate through each level, adding node values to the result vector. By pushing child nodes into the queue, we ensure the traversal proceeds level by level from left to right. This approach guarantees the correct level order traversal of the binary tree.