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**nagasupreeth**

Given a binary tree, you need to compute the length of the diameter of the tree. The diameter of a binary tree is the length of the **longest** path between any two nodes in a tree. This path may or may not pass through the root.

**Example:**

Given a binary tree

1 / \ 2 3 / \ 4 5

Return **3**, which is the length of the path [4,2,1,3] or [5,2,1,3].

**Note:**
The length of path between two nodes is represented by the number of edges between them.

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