LeetCode 190 | Reverse Bits | Bit Manipulation | Fast & Interview-Proven Solution | Pen & Paper

LeetCode 190 | Reverse Bits | Bit Manipulation | Fast & Interview-Proven Solution | Pen & Paper In this video we solve LeetCode 190 — Reverse Bits step-by-step with: • a clear bit-by-bit implementation (easy to code in interviews), • a fast bit-hack / swap-mask method (optimal constant-time operations), and • a lookup-table optimization for repeated calls. This lesson is tailored for manned preparation and general interview prep — ideal for coding rounds at big tech companies. Asked in interviews by: Amazon and other major companies (reported in prep resources and interview logs). Resources & references • Problem: LeetCode 190 — Reverse Bits. leetcode.com • Explanations & optimized patterns (bit masks, divide-and-conquer, lookup table). • Company-question logs / interview trackers that list this problem (Airbnb, Microsoft, Grofers, Texas Instruments in some trackers). Why watch this (short) video? • You’ll learn 3 distinct patterns you can pull out in interviews (bit-by-bit, bit-hacks, memoized lookup). • I explain which approach the interviewer expects vs which impresses (practical vs micro-optimized). • Perfect for quick last-minute review for onsite/phone rounds. Call to action Want more bit-manipulation & Blind 75 walkthroughs? Subscribe to Pen & Paper and visit: penpaperpreparation.com — practice problems, notes, and cheat sheets.