Number of Ways to Assign Edge Weights II | Leetcode 3559 | Binary Lifting | Concepts & Questions - 4

Whatsapp Community Link : https://www.whatsapp.com/channel/0029... Hi Everyone, this is the 4th video of our playlist “Binary Lifting – DP on Trees – Concepts & Questions” by codestorywithMIK. In this video we tackle the LeetCode 3559 – “Number of Ways to Assign Edge Weights II”. The problem can be solved elegantly with the Binary‑Lifting (Power‑of‑Two Jump) pattern – the same machinery used for k‑th ancestors and LCA. You will see the step‑by‑step reasoning that converts a naïve O(N²) approach into an O(N log N) solution, a complete dry‑run on a small tree, and a ready‑to‑copy C++ implementation (the Java version is identical). 🎯 What the Video Covers - Why a brute‑force enumeration of all paths is impossible for large N. Building the ancestor table ancestorTable[v][j] (2^j‑th ancestor) in O(N log N). Using binary lifting to obtain LCA(u, v) in O(log N). Turning the distance d = depth[u] + depth[v] – 2·depth[lca] into the answer 2^{d‑1} (mod 1e9+7). Full story‑to‑code walkthrough (C++ / Java). 📂 Resources Video Name : Number of Ways to Assign Edge Weights II | Leetcode 3559 | Binary Lifting | Concepts & Questions - 4 | codestorywithMIK GitHub Code (C++/Java) : https://github.com/MAZHARMIK/Intervie... LeetCode Link : https://leetcode.com/problems/number-... Company Tags : Will update later 📚 Other Playlists - DP Concepts Playlist :    • Roadmap for DP | How to Start DP ? | Topic...   Graph Concepts Playlist :    • Graph Concepts & Qns - 1 : Graph will no m...   Segment Tree Concepts Playlist :    • Segment Tree | Introduction | Basics | Bui...   Recursion Concepts Playlist :    • Introduction | Recursion Concepts And Ques...   Trie Playlist :    • Word Search II | Leetcode 212 | Detailed |...   Difference‑Array Technique :    • Introduction | What | How | Difference Arr...   Line‑Sweep Technique :    • Introduction | What | Why | Line Sweep Tec...   Top K from Sorted Structures Pattern :    • Introduction | Top K from Sorted Structure...   Small Dopamine Java Videos :    • Small Java Dopamine Videos | codestorywithMIK   GitHub Repo (full interview prep) : https://github.com/MAZHARMIK/Intervie... Social - Instagram :   / codestorywithmik   Facebook :   / 100090524295846   Twitter :   / cswithmik   Subscribe :    / @codestorywithmik   ╔═╦╗╔╦╗╔═╦═╦╦╦╦╗╔═╗ ║╚╣║║║╚╣╚╣╔╣╔╣║╚╣═╣ ╠╗║╚╝║║╠╗║╚╣║║║║║═╣ ╚═╩══╩═╩═╩═╩╝╚╩═╩═╝ 📝 Video Summary Pre‑process the tree into an ancestor table where ancestorTable[v][j] stores the 2^j‑th ancestor of node v. LCA is found by lifting the deeper node to the same depth and then jumping both nodes together using the binary‑lifting table. The distance between two nodes is d = depth[u] + depth[v] – 2·depth[lca]. The answer for each query is 2^{d‑1} (mod 1e9+7) (or 0 when d = 0). ✨ Timelines✨ 00:00 - Introduction 00:09 - Motivation 00:24 - Problem Explanation 05:40 - Revisiting Part I 08:28 - How to find distance ? 15:20 - Step by Step 23:31 - LCA Corner Case 25:06 - Coding line by line #BinaryLifting #DPOnTrees #AncestorTable #KthAncestor #LCA #TreeQueries #Heap #PriorityQueue #CodingInterview #LeetCode #Hackerrank #DataStructures #Algorithms #InterviewPrep #TechInterview #CodestorywithMIK #HindiCoding #Hinglish #CompetitiveProgramming #SoftwareEngineer #Google #Amazon #Microsoft #Facebook #TechCareer #LearningTogether #100DaysOfCode #GrowthMindset #GitHub #YouTubeEducation #ContentCreator #MIK #mik #TopK #TopKPatterns #coding #leetcode #dsa #dsalgo #interviewpreparation #hindicoding #algorithms #priorityqueue #heappatterns #topkproblems #bestfirstsearch #matrixproblems #pairsums #subarraysums #mergeksortedlists #kthsmallest #codestorywithmik #developers #careergoals #careerdevelopment #designthinking #youtubeeducation #contentcreator #BinaryLifting #DPOnTrees #AncestorTable #LCA #TreeQueries #EdgeWeights #LeetCode3559 #NumberOfWays #BinaryLiftingTemplate #CodingInterview #LeetCode #Hackerrank #DataStructures #Algorithms #InterviewPrep #TechInterview #CodestorywithMIK #HindiCoding #Hinglish #CompetitiveProgramming #SoftwareEngineer #Google #Amazon #Microsoft #Facebook #TechCareer #LearningTogether #100DaysOfCode #GrowthMindset #GitHub #YouTubeEducation #ContentCreator #MIK #mik #coding #dsa #dsalgo #interviewpreparation #hindicoding #algorithms #priorityqueue #heappatterns #topkproblems #bestfirstsearch #matrixproblems #pairsums #subarraysums #mergeksortedlists #kthsmallest #codestorywithmik #developers #careergoals #careerdevelopment #designthinking #youtubeeducation #contentcreator