NAB Innovation Center India Interview Questions and Answers

There is two rounds of coding test one is offline and another is online
offline has 3 coding test it was easy
online has 1 machine java coding test it was little bit tough i able to pass with 100% uses cases

This came
There is a board made of two rows and N columns. The board is represented by two strings, rowl and row2, made of characters 'R', 'W' and/or '?'. A board is balanced if, in each row and in each column, the number of characters 'R' is equal to the number of characters 'w'. For example, the following board is balanced:
?RW?WR ?WR?RW
and the following board is not balanced:
W?WR? R??W?
(there are two characters 'w' and one character 'R' in the first row).
The question marks ('?') can be replaced with 'w' or 'R'. What is the minimum number of replacements needed to balance the board?
Write a function:
class Solution { public int solution (String row1, String row2);
}
that, given two strings row1 and row2 made of N characters each, returns the minimum number of replacements needed to balance the board. If it is not possible to balance the board, the function should return -1.
Examples:
1. For row1 = "W?WR?" and row2 = "R??W?", the board initially looks as follows:
W?WR?
R??W?
The last question mark in the first row and the second question mark in the second row
can be replaced with 'R'. The last question mark in the second row can be replaced with 'w'. After these replacements, the board is balanced and looks as follows:
W?WRR R?RWW
The function should return 3.
2. For row1 = "R?R??" and row2 = "??W??", five replacements are needed to balance the board:
R?RWW W?WRR
The function should return 5.
3. For row1 = "RR?" and row2 = "?R?", it is not possible to balance the board. The function should return -1.
4. For row1 = "www??" and row2 = "RRR??", it is not possible to balance the board. The function should return -1.
5. For row1 = "?RW?WR" and row2 = "?WR?RW", the board is already balanced. The function should return 0.
Write an efficient algorithm for the following assumptions:
⚫ row1 and row2 are made only of the characters 'W', 'R' and/or '?'";
⚫ row1 and row2 have the same length, equal to N;
• N is an integer within the range [1..100,000].

Q1. How microservices communicate with each other
Ans. 
Microservices communicate with each other through APIs and messaging protocols.
• Microservices communicate via RESTful APIs, allowing them to make requests and receive responses.

• Message brokers like RabbitMQ or Kafka are used for asynchronous communication between microservices.

• Service discovery tools like Consul or Eureka help microservices locate and communicate with each other.

• Microservices can also use gRPC for high-...read more
Answered by AI
Add your answer
Q2. Simple java use case scenario which include sorting
Ans. 
A Java use case scenario demonstrating sorting of an array of strings alphabetically.
• Create an array of strings: String[] fruits = {"Banana", "Apple", "Cherry"};

• Use Arrays.sort() method to sort: Arrays.sort(fruits);

• Print sorted array: System.out.println(Arrays.toString(fruits)); // Output: [Apple, Banana, Cherry]

• Sorting can be customized using a Comparator for case-insensitive sorting.
Answered by AI
Add your answer

Q1. About project implemented
Add your answer
Q2. What technologies used in current company
Ans. 
Our current company uses a variety of technologies including cloud computing, data analytics, and machine learning.
• Cloud computing services such as AWS or Azure

• Data analytics tools like Tableau or Power BI

• Machine learning algorithms implemented using Python or R
Answered by AI
Add your answer
Q3. Some general technical scenarios how it will be solved
Add your answer

Q1. They ask your expectations no negotiation you need to accept whatever they have in your budget
Add your answer

Q1. What questions did the interviewers ask regarding data structures, testing frameworks, Git, and your project during the tester interview?
Add your answer
Q2. What is the 3 bulbs and 3 switches puzzle, and what is the stock problem in data structures?
Add your answer

Assignment concerning Anti-Money Laundering (AML), transaction monitoring, and fraud analysis.

Q1. Can you introduce yourself and describe your skills, qualities, and the knowledge you have gained over time?
Ans. 
I am a highly skilled Senior Analyst with expertise in data analysis, problem-solving, and project management.
• Proficient in data analysis tools such as Excel, SQL, and Tableau

• Strong problem-solving skills with a track record of improving processes and efficiency

• Experienced in project management, leading cross-functional teams to successful outcomes

• Excellent communication and presentation skills, able to convey complex ...read more
Answered by AI
Add your answer

Q1. What questions do you have about the job profile, the skills you possess, and how you can effectively demonstrate those skills?
Add your answer

Q1. What is your experience with salary negotiations?
Ans. 
I have extensive experience with salary negotiations in previous roles.
• I have successfully negotiated salary increases during annual performance reviews.

• I have negotiated starting salaries for new hires to ensure competitive compensation.

• I am familiar with industry standards and market rates, allowing me to negotiate effectively.

• I have received training on negotiation techniques to improve my skills in this area.
Answered by AI
Add your answer

The first round was the codility test online, we were given 120 minutes to solve 3 problems

1: find the smallest char combination from a alphabet string for example
If String S= “adobe”;
The out put should be: ab

3: if there is five person, two of them 1 single room, and three of them are ok with twin sharing, how many rooms should they require

Int[] A={1,1,2,2,2};

The first two will have 1 room each, the another two would be adjusted in one, and for the last one we would require another room, so total 4 rooms are required