Swajat Interview Questions and Answers

Reverse a singly linked list of integers and return the head of the reversed linked list.

• Iterate through the linked list and reverse the pointers to point to the previous node instead of the next node.

• Use three pointers to keep track of the current, previous, and next nodes while reversing the linked list.

• Update the head of the reversed linked list as the last node encountered during the reversal process.

Yes, I can analyze SQL queries and code snippets to determine correct outputs or errors.

• Understand the SQL syntax and logic to identify errors in queries.

• Check for syntax errors, missing or incorrect keywords, and data type mismatches.

• Analyze the code snippets to identify logical errors or potential bugs.

• Compare the expected output with the provided output to determine correctness.

Joins are used to combine rows from two or more tables based on a related column, while indexing is a technique to improve the performance of queries by creating a data structure that allows for quick lookup of data.

• Joins are used to retrieve data from multiple tables based on a related column, such as INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• Indexing involves creating data structures like B-trees or hash tables to quickly locate rows in a table, improving query perfo...read more

Python is a high-level, interpreted language known for its simplicity and readability, while C++ is a low-level, compiled language known for its performance and efficiency.

• Python is dynamically typed, while C++ is statically typed.

• Python uses indentation for code blocks, while C++ uses curly braces.

• Python has automatic memory management, while C++ requires manual memory management.

• Python is slower in execution compared to C++ due to its interpreted nature.

• Python is commonly u...read more

Count the number of ones in a given number using pseudo code

• Initialize a count variable to 0

• Iterate through each bit of the number and check if it is 1

• Increment the count if the bit is 1

• Return the count as the result