Lyearn Interview Questions and Answers

Find 2 elements in array that add up to a given sum.

• Use a hash set to store elements as you iterate through the array.

• For each element, check if the difference between the sum and the element is in the hash set.

• Return the pair of elements that add up to the given sum.

Authentication verifies the identity of a user, while authorization determines what a user can access.

• Authentication confirms the user's identity through credentials like passwords or biometrics.

• Authorization controls the user's access to resources based on their authenticated identity.

• Example: Logging into a website (authentication) and then being able to view/edit your profile (authorization).

Design a notification service for sending alerts to users.

• Use a scalable messaging system like Kafka or RabbitMQ for reliable message delivery.

• Implement a notification queue to handle notifications in a timely manner.

• Include different channels for notifications such as email, SMS, and push notifications.

• Allow users to customize their notification preferences and frequency.

• Consider implementing a notification history fe