Left and Right Sum Differences (Optimal O(1) Approach) | Amazon SDE Interview Approach

Most candidates solve LeetCode 2574 (Left and Right Sum Differences) using three separate arrays, but what if I told you there’s a mathematical cheat code that lets you solve this in O(1) auxiliary space? In today’s whiteboard breakdown, we tackle the problem from the perspective of a real tech interview. We’ll start with the "brute force" approach, discuss why combining loops might actually slow down your CPU, and finally, drop the O(1) space optimization that gets you the "Strong Hire" rating. Welcome back to the weekend interview series on Hey It's Sparsh! Drop a comment if this mathematical cancellation trick blew your mind, and let me know which POTD we should tear down next week. #leetcode #codinginterview #softwareengineer #datastructures #HeyItsSparsh #LeetCode2574 #prefixsum #techinterviewprep