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In this lesson, were going to write code to delete a node from binary search tree. In most data structures deletion is tricky. In case of binary search trees too, its not so straightforward. So lets first see what all complications we may have while trying to delete a node from binary search tree. I have drawn a binary search tree of integers here. As we know in a binary search tree for each node value of all nodes in its left subtree is lesser and value of all nodes right subtree is greater. For example, in this tree if Ill pick this node with value 5 then we have 3 and 1 in its left subtree which are lesser and we have 7 and 9 in its right subtree which are greater, and you can pick any other node in the tree and this property will be true else the tree is not a BST. Now when we need to delete a node, this property must be conserved. Lets try to delete some nodes from this example tree and see if we can rearrange these things and conserve the property of binary search tree or no
