Dev International Interview Questions and Answers

Delivery Boy

• Responsible for delivering packages and goods to customers

• Navigating routes and following delivery schedules

• Maintaining accurate records of deliveries and payments

• Providing excellent customer service

• May require heavy lifting and driving skills

Hash map is a data structure that stores key-value pairs and uses a hash function to map keys to indices in an array.

• Hash function is used to convert the key into an index in the array

• Collisions occur when two keys map to the same index, which can be resolved using separate chaining or open addressing

• Load factor is the ratio of number of elements to the size of the array, and affects the performance of hash map

• Operatio...read more

SQL query to get 2nd highest salary

• Use ORDER BY and LIMIT to get the highest salary

• Use subquery to exclude the highest salary and get the 2nd highest

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 1,1

To sell a product, understand the customer's needs, highlight the benefits, and create a sense of urgency.

• Research the target audience and their pain points

• Highlight the unique features and benefits of the product

• Create a sense of urgency through limited time offers or scarcity

• Provide excellent customer service and follow-up

• Offer incentives or discounts for repeat business

• Use persuasive language and storytelling to con...read more