Which tree traversal method visits the nodes level by level starting from the root?

Question

BlackTom AI · Accepted Answer

To determine which tree traversal visits nodes level by level starting from the root, let's consider how each traversal operates.
Option 1: Level-order traversal. This method is defined as visiting nodes level by level, starting at the root, and proceeding left to right within each level. It is also known as breadth-first traversal, which directly matches the description in the question.
Option 2: Pre-order traversal. This approach visits the root of a subtree first, then recursively traverses the left subtree, followed by the right subtree. It does not respect level-by-level ordering, as deeper descendants may be visited before other nodes on the same level.
Option 3: In-order traversal. In a binary tree, in-order traversal visits the left subtree, then the root, and finally the right subtree. This sequence emphasizes visiting nodes in a sorted order for binary search trees, not level-wise progression.
Option 4: Post-order traversal. Here, the traversal processes the left subtree, the right subtree, and then the root. Again, this prioritizes bottom-up visitation and does not follow a level-by-level pattern.
In summary, the distinguishing feature of level-order traversal is its breadth-first, level-by-level visitation starting at the root, which sets it apart from the depth-first patterns of pre-order, in-order, and post-order traversals.

Which tree traversal method visits the nodes level by level starting from the root?

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