Binary Tree Traversals

Derive preorder, inorder, and postorder visit positions from the recursive root–left–right traversal template.

Calculate the time and auxiliary-space complexity of a binary-tree traversal in terms of node count and tree height.

Implement recursive preorder traversal of a binary tree in Java.

Implement recursive inorder traversal of a binary tree in Java.

Implement recursive postorder traversal of a binary tree in Java.

Implement level-order traversal in Java using a queue.

Choose among preorder, inorder, and postorder by identifying whether a task requires processing a parent before, between, or after its subtrees.

Choose between depth-first and level-order traversal based on whether a task depends on subtree structure, node depth, or memory constraints.

Use inorder traversal to return the keys of a binary search tree in sorted order.

Validate a distinct-key binary search tree by checking the ordering produced by an inorder traversal.

Determine whether given traversal sequences and structural constraints are sufficient to reconstruct a unique binary tree.

Reconstruct a distinct-key binary tree from its preorder and inorder traversal sequences.