Q1: Maximize (Min + Max) Subarray

• Problem: Given an array of integers, find a contiguous subarray where the sum of its minimum element and maximum element is maximized.

Q2: Chat System Logger (System Design/Coding)

• Problem: Implement a Logger class with two main functions:
  1. logMessage(sender, receiver, message, timestamp): Records chat activity.
  2. getMostActiveUser(): Returns the user who sent the most messages.

Follow-up: Top K Active Users

• Requirement: Modify the system to return the top $K$ most active members.