Western Governors University (WGU) ICSC2100 C949 Data Structures and Algorithms I Practice Exam

To remove a leaf node from a tree, the appropriate method involves unlinking the node from its parent. A leaf node is defined as a node that has no children, making its removal straightforward since there are no additional connections to update beyond removing its reference from the parent.

When unlinking a node, the parent node will simply need to set its pointer/reference to the leaf node to null (or equivalent), effectively removing the leaf node from the tree structure without altering any other nodes. This approach maintains the integrity of the tree since it does not require complex reorganization of the data structure.

Other methods such as re-linking the node, promoting the sibling, or replacing with a dummy node are not necessary or applicable when dealing specifically with leaf nodes, as these actions pertain more to nodes that have children or require additional modification of the tree structure.

Understanding the simplicity of removing a leaf node by unlinking reinforces the key principles of tree operations, emphasizing that leaf nodes can be removed with minimal changes to the overall structure.