In this post, we will solve **Kundu and Bubble Wrap HackerRank Solution**. This problem **(Kundu and Bubble Wrap)** is a part of **HackerRank Functional Programming** series.

**Task**

Kundu has a Bubble Wrap and like all of us she likes popping it. The Bubble wrap has dimensionsÂ *NxM*, i.e. it hasÂ *N*Â rows and each row hasÂ *M*Â cells which has a bubble. Initially all bubbles in filled with air and can be popped.

What Kundu does is randomly picks one cell and tries to pop it, there might be a case that the bubble Kundu selected is already popped. In that case he has to ignore this. Both of these steps take 1 second of time. Tell the totalÂ expected numberÂ of seconds in which Kundu would be able to pop them all.

**Input**

Input contains a single line containing two space seperated integers,Â *N M*, representing the dimension of Bubble wrap.

**Output**

Output the required answer in one line. The answer will be considered correct, if its absolute error doesn’t exceed 10^{-2}.

**Constraints**

- 1 â‰¤Â
*N, M*Â â‰¤ 1000

**Sample Input #00**

`1 1`

**Sample Output #00**

`1`

**Sample Input #01**

`1 2`

**Sample Output #01**

`3`

**Sample Input #02**

`2 2`

**Sample Output #02**

`8.3333333333`

**Explanation**

* Test Case #00:*Â There is only one bubble, so he needs only one chance to pop it.

*Â Expected number of steps of popping two bubbles is 3.*

**Test Case #01:***Â There are 4 bubbles with equal probability of popping out. Expected number of steps to pop all of them is 8.333333…*

**Test Case #02:****Solution – Kundu And Bubble Wrap – HackerRank Solution**

**Scala**

import java.util.Scanner object Solution { val count = 100000000000000000L def main(args: Array[String]): Unit = { val sc = new Scanner(System.in) val m = sc.nextInt val n = sc.nextInt sc.close() val q = m * n println((1 to q).map(v => calc(v, q)).sum) } def calc(v: Int, q: Int): Double = { val pNo = (q - v).toDouble / q (1 - math.pow(pNo, count)) / (1 - pNo) } }

**Note:** This problem **(Kundu and Bubble Wrap)** is generated by **HackerRank** but the solution is provided by **CodingBroz**. This tutorial is only for **Educational** and **Learning** purpose.