When removing an element from a binary search tree that has two children, replacing with it only child will ensure that the resulting tree is still a binary search tree. A binary search tree (BST) is a rooted binary tree that satisfies the binary search property.
The nodes are organized in total order, the nodes with keys larger than any given node are stored on the right subtrees, and the nodes with keys equal to or less than are put on the left subtrees. The root node (at the top) of every tree has some value. There are 0 or more child nodes of the root node. There are zero or more child nodes for each child node, and so forth. As a result, the tree gains a subtree. Each node has a separate subtree that consists of his children, their children, etc. This implies that any node can function as a tree on its own. Each node in a binary search tree (BST) has a maximum of two children, and each node's left descendant node's value is less than the value of the current node, which is less than the value of the right descendent nodes (if any).
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