**Important tips on General Trees, Binary Trees, Forest Trees, Extended Binary Trees Data structures**

*1. General Trees are data structures that store data elements hierarchically.*

*2 The top node of a tree is the ROOT NODE and each node, except the root, has a parent.*

*3. A Node in a general tree ( except the leaf node ) may have zero or more sub-trees.*

*4. General trees which have 3 sub-trees per node is known as ternary trees.*

*5. General trees which have 2 sub-trees per node is known as Binary trees.*

*6. The total number of sub-trees in general trees may be variable. For example, a node can have 1 sub-tree, whereas some other nodes have 3 sub-trees.*

*7. The overcome the complexity of general trees it should be converted into Binary Trees.*

*8. A Forest tree is a disjoint union of trees.*

*9. A set of disjoint trees is obtained by deleting the ROOT NODE and the edges connecting the root node to nodes of level 1.*

*10. Every node of a tree is the root node of some sub-tree. Therefore all the sub-trees immediately below a node form a forest.*

*11. In a Binary Trees, The topmost element is called as ROOT Node, and each node has 0, 1 and at the most 2 children.*

*12. A NODE that has 0 children is known as LEAF NODE.*

*13. Every node of trees has three different parts like INFO parts, LEFT Pointers for left sub-tree field and RIGHT Pointers for right sub-tree.*

*14. The ROOT element is pointed by "root pointer" and if root==NULL then it means the tree is empty.*

*15. The complete Binary tree is a Binary Tree that satisfies two more properties. First, all level is completely filled except the last one and secondly, all nodes appear as far left as possible.*

*16. In Complete Binary tree, there are exactly n nodes and level r of T can have at most 2 ^ n nodes.*

*17. A Binary Trees T is said to be Extended Binary Tree if each node in the tree has either no child or exactly two children.*

**Thanks**

**Mukesh Rajput**
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Thanks

Mukesh Rajput