Algorithms Software Interview Questions and Answers

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Q1. How internally work HashMap ?
Ans. 
HashMap uses key-value pairs, hashing, and buckets for efficient data retrieval and storage.
• HashMap stores data in key-value pairs, where each key is unique.

• It uses a hash function to compute an index (hash code) for each key.

• The computed index points to a bucket in an array where the value is stored.

• If multiple keys hash to the same index (collision), they are stored in a linked list or tree structure.

• Example: For a k...read more
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Q2. Write the logic of prime number
Ans. 
A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.
• A prime number has exactly two distinct positive divisors: 1 and itself.

• Examples of prime numbers include 2, 3, 5, 7, 11, and 13.

• The number 1 is not prime because it has only one positive divisor.

• The number 4 is not prime because it can be divided by 1, 2, and 4.

• To check if a number n is prime, test divisi...read more
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Q3. Difference between hash map and hash set?
Ans. 
HashMap stores key-value pairs; HashSet stores unique keys without values.
• HashMap allows duplicate values but not duplicate keys. Example: {1: 'A', 2: 'B', 1: 'C'} results in {1: 'C', 2: 'B'}.

• HashSet only stores unique elements. Example: {1, 2, 2} results in {1, 2}.

• HashMap provides O(1) average time complexity for get and put operations.

• HashSet provides O(1) average time complexity for add, remove, and contains operati...read more
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Q1. Basic java questions
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Q2. Sql related questions
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Q1. Questions was based on SQL
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Q2. SQL queries and joins and
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