Maurice Tutor

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About Maurice Tutor

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Expertise:
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Teaching Since: May 2017
Last Sign in: 398 Weeks Ago, 2 Days Ago
Questions Answered: 66690
Tutorials Posted: 66688

Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 16 Sep 2017 My Price 5.00

undirected tree

Problem Desrcription

Shil likes to play with trees a lot.He is playing with an undirected tree containing N nodes.He wants to find out total number of unordered triplets (A,B,C) such that A is not connected to B, B is not connected to C and A is not connected to C by a direct edge (No two of A, B, C are mutually connected). Since he doesn't like to play with this alone , he asks for your help.

 

Input

The first line of each test case contains a single integer N denoting the number of nodes.
Next N - 1 lines consists of two integers u and v describing an edge from u to v

Output

Output a single line containing total number of triplets.

Constraints

  • 1 = N = 105
  • 1 = u, v = N

 

Example

Input:
5 1 2 1 3 3 4 2 5 Output:
1

 

Explanation

The only possible triplet is (1,4,5)

Answers

Maurice Tutor
(5)
Status NEW Posted 16 Sep 2017 02:09 PM My Price 5.00

Hel-----------lo -----------Sir-----------/Ma-----------dam-----------Tha-----------nk -----------You----------- fo-----------r u-----------sin-----------g o-----------ur -----------web-----------sit-----------e a-----------nd -----------and----------- ac-----------qui-----------sit-----------ion----------- of----------- my----------- po-----------ste-----------d s-----------olu-----------tio-----------n.P-----------lea-----------se -----------pin-----------g m-----------e o-----------n c-----------hat----------- I -----------am -----------onl-----------ine----------- or----------- in-----------box----------- me----------- a -----------mes-----------sag-----------e I----------- wi-----------ll

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