Number of ZigZag Arrays I | Brute Force | Better | Optimal | Leetcode 3699 | codestorywithMIK

Whatsapp Community Link : https://www.whatsapp.com/channel/0029... Hi Everyone, this is the 146th video of our Playlist "Dynamic Programming : Popular Interview Problems" by codestorywithMIK. Today we will be solving a very good problem based on DP : Number of ZigZag Arrays I | Brute Force | Better | Optimal | Leetcode 3699 | codestorywithMIK Problem Name : Number of ZigZag Arrays I | Brute Force | Better | Optimal | Leetcode 3699 | codestorywithMIK Company Tags : will update later My solutions on Github(C++ & JAVA) : https://github.com/MAZHARMIK/Intervie... Leetcode Link : https://leetcode.com/problems/number-... We will start solving right from pure brute force and then we will get to a better approach and ultimately we will move to the Optimal approach. We will see the reason behind everything during the entire explanation. My DP Concepts Playlist :    • Roadmap for DP | How to Start DP ? | Topic...   My Graph Concepts Playlist :    • Graph Concepts & Qns - 1 : Graph will no m...   My Segment Tree Concepts Playlist :    • Segment Tree | Introduction | Basics | Bui...   My Recursion Concepts Playlist :    • Introduction | Recursion Concepts And Ques...   Trie Playlist -    • Word Search II | Leetcode 212 | Detailed |...   Difference Array Technique: Concepts & Qns :    • Introduction | What | How | Difference Arr...   My Line Sweep Technique Playlist :    • Introduction | What | Why | Line Sweep Tec...   Small Dopamine Java Videos -    • Small Java Dopamine Videos | codestorywithMIK   My GitHub Repo for interview preparation : https://github.com/MAZHARMIK/Intervie... Instagram :   / codestorywithmik   Facebook :   / 100090524295846   Twitter :   / cswithmik   Subscribe to my channel :    / @codestorywithmik   ╔═╦╗╔╦╗╔═╦═╦╦╦╦╗╔═╗ ║╚╣║║║╚╣╚╣╔╣╔╣║╚╣═╣ ╠╗║╚╝║║╠╗║╚╣║║║║║═╣ ╚═╩══╩═╩═╩═╩╝╚╩═╩═╝ Video Summary : Approach-1 : Think recursively — at each position, given the previous value and whether we must now go up or down, try every valid next value and count the ways to complete the array. Memoize to avoid recomputing the same (position, prevVal, direction) states. Approach-2 : Same idea, but built bottom-up. Start from the last position (every value is a valid ending) and fill the table backward, so each state is computed directly from already-known states instead of recursion. Approach-3 : The inner loop in Approach-2 just sums a contiguous range of next values, so replace it with prefix sums. Each transition becomes O(1), bringing the total work down from O(n·m²) to O(n·m). ✨ Timelines✨ 00:00 Introduction 00:07 Motivation 00:30 Problem Explanation 03:39 Thought Process + range Simplification ? 12:24 Why Recursion 23:03 Story of Recursion 29:49 Coding Recursion Memo 37:41 Bottom Up 46:30 Coding Bottom Up 52:05 Optimal Prefix Sum 01:03:33 Coding Optimal #MIK #mik #Mik #coding #helpajobseeker #easyrecipes #leetcode #leetcodequestionandanswers #leetcodesolution #leetcodedailychallenge #leetcodequestions #leetcodechallenge #hindi #india #coding #helpajobseeker #easyrecipes #leetcode #leetcodequestionandanswers #leetcodesolution #leetcodedailychallenge #leetcodequestions #leetcodechallenge #hindi #india #hindiexplanation #hindiexplained #easyexplaination #interview#interviewtips #interviewpreparation #interview_ds_algo #hinglish #github #design #data #google #video #instagram #facebook #leetcode #computerscience #leetcodesolutions #leetcodequestionandanswers #code #learning #dsalgo #dsa #coding #programming #100daysofcode #developers #techjobs #datastructures #algorithms #webdevelopment #softwareengineering #computerscience #pythoncoding #codinglife #coderlife #javascript #datascience #leetcode #leetcodesolutions #leetcodedailychallenge #codinginterview #interviewprep #technicalinterview #interviewtips #interviewquestions #codingchallenges #interviewready #dsa #hindi #india #hindicoding #hindiprogramming #hindiexplanation #hindidevelopers #hinditech #hindilearning #helpajobseeker #jobseekers #jobsearchtips #careergoals #careerdevelopment #jobhunt #jobinterview #github #designthinking #learningtogether #growthmindset #digitalcontent #techcontent #socialmediagrowth #contentcreation #instagramreels #videomarketing #codestorywithmik #codestorywithmick #codestorywithmikc #codestorywitmik #codestorywthmik #codstorywithmik #codestorywihmik #codestorywithmiik #codeistorywithmik #codestorywithmk #codestorywitmick #codestorymik #codestorwithmik