Amdocs Application Developer Interview Questions and Answers

Q1. Stacks queues data structures
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Round duration - 60 Minutes
Round difficulty - Medium

This was a proctured online coding test where we had 2 questions to solve under 60 minutes. Both the questions were of Easy to Medium level of difficulty and can be solved if one has a decent command over Data Structures and Algorithms.

Q1. 
Count Subsequences Problem Statement
Given an integer array ARR of size N, your task is to find the total number of subsequences in which all elements are equal.
Explanation:
A subsequence of an array i...read more
Ans. 
Approach :
1) Store the frequency of each element in a hashmap (say, ‘FREQ’).

2) Maintain a variable ‘RESULT’ which stores the final answer.

3) For each element present in the hashmap,
3.1) Calculate the value of (2^eleCount - 1) % MOD, ‘eleCount’ is frequency of current element.
3.2) Add the above value to ‘RESULT’

4) The final answer is the value of ‘RESULT’ after we are done iterating over all the elements of the hashmap.


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Q2. 
Anagram Pairs Verification Problem
Your task is to determine if two given strings are anagrams of each other. Two strings are considered anagrams if you can rearrange the letters of one string to form the...read more
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Approach :

1) Sort both strings, so that all the same characters come together
2) Then loop through both strings together and check each element in both strings one by one
3) If at any position, the characters are found to be different or if the lengths of the two strings are different, they cannot be anagrams
4) Otherwise, they will be anagrams.

TC : O(N * log(N) + (M * log(M))), where N and M are the lengths of the two in
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Round duration - 60 Minutes
Round difficulty - Medium

This round had one preety simple question related to DSA and then I was asked some questions revolving around DBMS and OOPS. I was also asked to write a simple SQL query at the end.

Q1. 
Matrix Transpose Problem Statement
Given a matrix MAT, your task is to return the transpose of the matrix. The transpose of a matrix is obtained by converting rows into columns and vice versa. Specificall...read more
Ans. 
Approach :

1) Declare2-dimensional array t to store the transpose of the matrix. This array will have the reversed dimensions as of the original matrix.

2) The next step is to loop through the original array and to convert its rows to the columns of matrix t.
2.1) Declare 2 variables i and j.
2.2) Set both i,j=0
2.3) Repeat until i 2.3.1) Repeat until j 2.3.2) t[i][j] = p[j][i]
2.3.3) j=j+1**
2.4) i=i+1

3) The last step is to ...read more
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Q2. What is the main difference between UNION and UNION ALL?
Ans. 
UNION and UNION ALL are used to join the data from 2 or more tables but UNION removes duplicate rows and picks the rows which are distinct after combining the data from the tables whereas UNION ALL does not remove the duplicate rows, it just picks all the data from the tables.
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Q3. What do you mean by virtual functions in C++?
Ans. 
1) A C++ virtual function is a member function in the base class that you redefine in a derived class. It is declared using the virtual keyword.
2) It is used to tell the compiler to perform dynamic linkage or late binding on the function.
3) When the function is made virtual, C++ determines which function is to be invoked at the runtime based on the type of the object pointed by the base class pointer.

Some rules regardi...read more
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Round duration - 60 Minutes
Round difficulty - Medium

This round had questions from Linked List followed by some questions from OS and then at last I was asked an interesting puzzle.

Q1. 
Middle of a Linked List
You are given the head node of a singly linked list. Your task is to return a pointer pointing to the middle of the linked list.
If there is an odd number of elements, return the ...read more
Ans. 
Approach :
1) If the head is NULL, we simply return HEAD.
2) If there is only one element in the linked list, we simply return it as it is the midpoint.
3) Otherwise, we initialise 2 pointers ‘fast’ and ‘slow’ both poiniting to head initially.
4) We traverse the linked list until fast is the last element or fast is beyond the linked list i.e it points to NULL.
5) In each iteration, the ‘fast’ pointer jumps 2 times faster as...read more
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Q2. Can you explain the concepts of multitasking and multiprogramming?
Ans. 
Multitasking :
1) In Multitasking, a single resource is used to process multiple tasks.
2) The process resides in the same CPU.
3 It is time sharing as the task assigned switches regularly.
4) Multitasking follows the concept of context switching.



Multiprogramming : 
1) In multiprogramming, multiple programs execute at a same time on a single device.
2) The process resides in the main memory.
3) It uses batch OS. The CPU ...read more
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Q3. What is the major difference between 32-bit and 64-bit processors?
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A major difference between 32-bit processors and 64-bit processors is the number of calculations per second they can perform, which affects the speed at which they can complete tasks. 64-bit processors can come in dual-core, quad-core, six-core, and eight-core versions for home computing. Multiple cores allow for an increased number of calculations per second that can be performed, which can increase the processing pow...read more
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Round duration - 30 Minutes
Round difficulty - Easy

This was a typical HR round with some standard Behavioral questions.

Q1. Can you tell me something about yourself?
Ans. 
Tip 1 : Prepare the points that you will speak in your introduction prior to the interview.
Tip 2 : Tell about your current cgpa, achievements and authenticated certification
Tip 3 : I told about my role in current internship and what all I do
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Q2. Why do you want to be a part of Oracle?
Ans. 
Tip 1 : Oracle technologies are modern, cutting edge and built for enterprise requirements (think world class security, availability, performance, scalability, integrated ML/AI and so forth). Oracle Database is #1 worldwide. 
Tip 2 : Since it’s inception, Oracle has become a market leader when it comes to database. Oracle has its own all possible solution for it’s clients whether it is into IT or Banking.
Tip 3 : Or...read more
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