LeetCode 2582: Pass the Pillow | CSharp Solution | Simulation

Solve LeetCode 2582 Pass the Pillow, an Easy simulation problem that tests your ability to model cyclic back-and-forth patterns — a surprisingly common pattern in interviews and assessments. --- 🎯 Simulate a bouncing index pattern using simple division and modulo arithmetic 🧠 How to recognize direction-reversal cycles and reduce them to math before writing a single line of code 💻 Clean, readable CSharp implementation with no extra arrays or state tracking 📊 Why this runs in O(1) time and O(1) space once you see the cycle structure ⚡ Off-by-one errors on cycle boundaries and why the direction flips exactly where beginners get tripped up --- 00:00 - Understanding problem statement 00:50 - Problem breakdown 01:30 - Dry run without extra time 03:04 - Dry run with extra time 03:32 - Big O Notation 03:53 - Coding in C# --- ⏱️ Time Complexity : O(1) 💾 Space Complexity : O(1) 📌 Difficulty : Easy 🔧 Technique : Simulation / Cycle Math --- 1. LeetCode 1518 – Water Bottles (Easy) 2. LeetCode 2169 – Count Operations to Obtain Zero (Easy) 3. LeetCode 2011 – Final Value of Variable After Performing Operations (Easy) 4. LeetCode 1232 – Check If It Is a Straight Line (Easy) --- 🔗 LeetCode Problem : https://leetcode.com/problems/pass-the-pillow/ --- If this helped you, hit the like button and subscribe so you never miss a solution. Drop your questions or alternative approaches in the comments — I read and reply to all of them. --- #leetcode #csharp #codinginterview #dsa #leetcodeeasy #simulation #dotnet #csharpdev #problemsolving #techinterview #competitiveprogramming #leetcodesolution #softwareengineer #interviewprep #algorithmspractice ---