S B Infowaves Full Stack Developer Interview Questions and Answers

Q1. Print unique numbers in list
Ans. 
Print unique numbers in list
• Iterate through the list and store each number in a set to keep track of unique numbers

• Print out the numbers in the set to display the unique numbers
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Mcq + dsa JavaScript questions

Q1. JavaScript advance topics and database design topics
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Q1. Situation based question and behavioural questions
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Basic Aptitude questions were there which I think anyone can clear.

2 easy level programming questions were asked.

Q1. Introduction, background, interest, vision.
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Coding test consists of easy to medium difficulty problems.

Q1. HashMap in java
Ans. 
HashMap in Java is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• HashMap is part of the Java Collections framework.

• It uses hashing to store key-value pairs, allowing for O(1) retrieval time on average.

• Keys in a HashMap must be unique, but values can be duplicated.

• Example: HashMap map = new HashMap<>(); map.put("key1", 1); int value = map.get("key1");
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Q1. First non repeating character in a string
Ans. 
Find the first non-repeating character in a string.
• Create a hash table to store character frequency

• Iterate through the string and update the hash table

• Iterate through the string again and return the first character with frequency 1
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Q2. Longest substring pallandrome in a string
Ans. 
Find the longest substring that is a palindrome in a given string.
• Use dynamic programming to solve the problem efficiently.

• Create a 2D boolean array to store the results of subproblems.

• Check for palindromes of length 1 and 2 separately.

• For substrings of length greater than 2, check if the first and last characters are the same and the substring between them is also a palindrome.

• Update the result if a longer palindrome
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Basic coding question on array and string.