12. Insert-Delete-GetRandom O(1) – LeetCode 380 ⚡ Vector + HashMap Trick | Clean & Optimal!
Notes
Unlock the mechanics behind achieving true O(1) performance for insert, delete, and random retrieval — a pattern heavily adopted in enterprise-grade systems for low-latency workloads.
In this video, we unpack how a dynamic array + hash map work in tandem to deliver a highly efficient RandomizedSet data structure.
#leetcode150 #dsa #codinginterview #cpp #hashmap #vectors #softwareengineering #bigO #shorts #programming
Discussion
Sign in to ask a question or share what you learned.