MountBlue-Job-Challenge (Important Questions)

HackerRank Strategy for Beginners

HackerRank Challenge: https://www.hackerrank.com/mountblue-technologies

• The problems in the challenge are ordered from easy to medium level of difficulty.
• There are ~120 problems.
• You can start off with problems on the following topics: Arrays, Strings, 2D Arrays.
• Once you are comfortable with these topics, you can move to topics like Hashmap, Mathematics, Recursion.
• Check https://bit.ly/submit_mb_prep for resources.

Once complete, submit on https://bit.ly/submit_mb_prep for getting interviewed

For more debugging and problem solving content in detail, check out https://github.com/mountblue/prep

Process :

1. Complete the MountBlue Job Challenge at https://www.hackerrank.com/mountblue-technologies. It has ~120 problems. We estimate it should take you 4-8 weeks to complete it. Also, there is no deadline to complete the challenge.
2. To submit the challenge, join Discord Community Server- https://discord.gg/FB7jmbbY6k and follow the instructions in the welcome channel.
3. Short interview with a MountBlue mentor. This is to verify if you have completed the challenge sincerely. In the interview, we will ask you to solve a few problems from the challenge itself.
4. Get a job offer from MountBlue

Important Questions - by me

1. Plus Minus Sum - https://p.ip.fi/5Vvr
2. Between-two-sets https://p.ip.fi/54st
3. Quicksort 1- Partition https://p.ip.fi/Yoq4
4. Breaking the Records https://p.ip.fi/MDBi
5. DrawingBook.java https://p.ip.fi/nn2f
6. Strong Password

Concept -

1. How do I call .get() on a 2d ArrayList

ArrayList<ArrayList<String>> list = new ArrayList<ArrayList<String>>();

arr.get(i).get(j);

2. precision problems. The test cases are scaled to six decimal places

    Formatter fm=new Formatter();
    
    fm.format("%.6f", pos/n);
    
    System.out.println(fm);

3. Sort Array,Arraylist

    sort in ascending order
   ArrayList- Collections.sort(arr);
   //sort in reverse order
   Collections.sort(calorie,Collections.reverseOrder());
   Array- Arrays.sort(arr)