# Number of edges binary tree with n leaf nodes

Did k 23 In any case, my answer was only intended to cover a specific type of tree. Thank you for your interest in this question. Of course you mean leaves rather than nodes.

This equation implies that every time you add another leaf, then the total number of nodes will increase by 2. An almost complete binary tree with N leaves that is not strictly binary has 2 N nodes. This reduces the size of the list by 1, no matter how we choose the nodes to give parents to. A number of edges binary tree with n leaf nodes tree consists of a finite set of nodes that is either empty, or consists of one specially designated node called the root of the binary tree, and the elements of two disjoint binary trees called the left subtree and right subtree of the root.

Any pointer in the tree structure that does not point to a node will normally contain the value NULL. Ned 1, 8 9. Now adding two children means taking away one leaf the parent used to be a leaf and adding two new leaves, which gives a total of one new leaf. Try deleting a leaf node

Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Each tree node has two pointers usually named left and right. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. I think Ned's answer is quite good for the more general case. Of course you mean leaves rather than nodes.

Of course you mean leaves rather than nodes. Questions Tags Users Badges Unanswered. For instance, consider the case where the root has a left and right child, the left child of the root has no children, and the right child of the root has a left and right child neither of which has any children. Try deleting a leaf node Tree terminology is generally derived from the terminology of family trees specifically, the type of family tree called a lineal chart.

I didn't actually see that bolded sentence below the question title before, and wrote this on the assumption that "complete" meant, well, complete. I haven't however been able to find a description of how this relation was derived. We will have finished constructing the tree only when there is one node left with no parent: This reduces the size of the list by 1, no matter how we choose the nodes to give parents to.

Try deleting a leaf node Tree terminology is generally derived from the terminology of family trees specifically, the type of family tree called a lineal chart. If "full" is the more common term for that, well, a rose by any other name