Table of Contents
How do I remove nodes?
To delete a node from the linked list, we need to do the following steps.
- Find the previous node of the node to be deleted.
- Change the next of the previous node.
- Free memory for the node to be deleted.
What are the three cases for deleting a node in the BST?
Here are the three cases that arise while performing a delete operation on a BST:
- Case 1: Node to be deleted is a leaf node. Directly delete the node from the tree.
- Case 2: Node to be deleted is an internal node with two children.
- Case 3: Node to be deleted is an internal node with one child.
How do you delete a node with only one child?
The node to be deleted has only one child. In this case, replace the node with its child and delete the child node, which now contains the value which is to be deleted. Simply replace it with the NULL and free the allocated space. In the following image, the node 12 is to be deleted. It has only one child.
How we can delete a node with two childs in a binary search tree using its right sub tree?
The same approach can be utilized to remove a node, which has two children:
- find a minimum value in the right subtree;
- replace value of the node to be removed with found minimum. Now, right subtree contains a duplicate!
- apply remove to the right subtree to remove a duplicate.
How do you delete the first node in a linked list?
Logic to Delete First Node of a Linked List.
- If head is NULL, return. There is no element in the linked list.
- Assign the head pointer to a temporary variable, tmp.
- Move the head to the next node. If the linked list has only one node, head will move to NULL.
- Delete the temporary pointer, tmp.
How do you remove an object from a linked list?
remove(Object O) method is used to remove any particular element from the linked list. Parameters: The parameter O is of the object type of linked list and specifies the element to be removed from the list. Return Value: Returns true if the specified element is found in the list.
How do you delete a node from a binary tree?
Deletion in a Binary Tree. Given a binary tree, delete a node from it by making sure that tree shrinks from the bottom (i.e. the deleted node is replaced by bottom most and rightmost node). This different from BST deletion. Here we do not have any order among elements, so we replace with last element. Examples :
What is a binary search tree?
A binary search tree is a rooted tree where each node can have at most 2 child nodes namely – left child and the right child. The value of the left child must be smaller than that of the root node. The value of the right child must be larger than that of the root node. Finally, all the values in the Binary Search tree must be unique.
How do you delete a node from a BST?
Binary Search Tree If we want to delete a node from BST, we basically have 3 different situations: Delete a leaf node For example, if we want to delete 19 from the above BST example, we can just simply wipe out the link and reclaim the memory by deleting the node and making its parent pointing to NULL (cut the link and wipe out the memory).
How do I delete a node in a leaf node?
If the node to be deleted is a leaf node, deleting the node alone is enough and no additional changes are needed. 2. The node to be deleted has one child: Copy the contents of the one-child to the current node and delete the child and no other modifications are needed.