# AthenaHealth Interview Experience (On – Campus)

Round 1: Hakerrank – 12 Questions – 90 mins

10 MCQ: Based on core subjects like OS, CN, and OOPS concepts. Also, Code related questions to predict the output of the given code.

2 Coding Questions:

1. Profit Target: Given an array of n elements where each element gives the yearly profit of a corresponding stock, find the max number of distinct pairs (pairs differing in at least one element) from the array that adds up to the given profit target.

Sample Input 1:

```[1,3,46,1,3,9] , sum = 47
possible pairs are: (1,46), (46,1), (46,1), (1,46)
indexes:  [0][2]  [2][0]  [2][3]  [3][2]
- four times due to repetition of '1'
- return only once - (46,1)
Hence, output = 1```

Sample Input 2:

```[5,7,9,13,11,6,6,3,3] sum = 12
possible pairs are: (5,7), (7,5), (9,3),
(9,3), (3,9), (9,3),
(6,6), (6,6)
indexes: [0][1] [1][0] [2][7] [2][8]
[7][2] [8][2] [5][6] [6][5]
return only distinct - (5,7), (9,3), (6,6)
Hence, output = 3```
2. Simple Max Difference: Given an array of size n where elements are closing prices of a particular stock on n days in order, find the maximum profit spread of the stock. Profit spread it the difference between the closing price of a day and the closing price on any of the previous days in history. If the prices remain flat or are continuously decreasing, return -1.

Sample input 1:

```[7,1,2,5]
1<7 -> continue;
2>1 -> 2-1 = 1 : diff
5>2 -> 5-2 = 3
5-1 = 4 : maximum diff = output```

Sample Input 2:

```[7,5,2,1]
5<7 , 2<5 , 1<2 -> continuously decreasing : return -1;```

Round 2: Technical Interview on Hakerrank CodePair – 60 mins

1. Based on projects – Blockchain

• What is blockchain?
• How is it useful?
• How does it ensure data confidentiality and integrity
• Explain its working.
2. Based on projects – MEAN Stack

• What did you do?
• What is mongo?
• What do you know about nonstructural databases?
3. Based on programming languages – C, C++, Java

• What is the difference between C, C++, and Java?
• What are object-oriented and procedural languages?
•  Is java a true object-oriented language? Is C++? Explain.
•  If yes, then how does java use primitive data types like int and char?
•  What is the difference between Integer Class and int data type?
•  For particular application development, how would you choose between C++ and Java
• What constraints would you focus on for the selection?
• What are pointers and how is the memory allocated for them?
• What is the problem with pointers – why were they removed when java was built?
• What are the Object-oriented concepts?
• Explain the difference between Encapsulation and Abstraction
• What is Inheritance?
• What are the types of inheritance?
• Do we need to explicitly call the parent class constructor from the child class constructor?
• Does C++ support all types of inheritance? Does Java support all?
• How are multiple inheritances handled in C++?
• Can Static variables in a class be accessed by the child classes that inherit it?
• What is the memory architecture in C++ Programming? – regarding heap, stack, and code
• If the stack is increased indefinitely due to the number of recursion calls, will it override the heap?
• Difference between String and StringBuilder classes? What is the use of StringBuilder?
4. Coding problem

• Implement Merge Sort
• Show Inheritance using abstract class

Round 3: HR – Basic behavioral questions.

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