Leetcode 733: Flood Fill | DSA Basics for Interview Prep

Leetcode 733 - Flood Fill Algorithm Explained | DFS & BFS | Perfect for DSA & Tech Interview Prep In this video, we solve Leetcode Problem 733: Flood Fill, one of the fundamental problems that tests your understanding of graph traversal, particularly Depth-First Search (DFS) and Breadth-First Search (BFS). This is a perfect beginner-friendly question that is often used in FAANG-level interviews to test how well you understand recursive logic and grid-based traversal. We’ll cover both DFS and BFS solutions, with code walkthrough, time and space complexity analysis, and insights on how interviewers evaluate such problems. ⭐️⭐️ Don't forget to subscribe to my channel! ⭐️⭐️ ■ Subscribe URL : https://www.youtube.com/channel/UCPGnMQDh7gdkmI_IadKdmfA?sub_confirmation=1 Thank you for your support! Susbcribe @MohitChhabraTech ╔═╦╗╔╦╗╔═╦═╦╦╦╦╗╔═╗ ║╚╣║║║╚╣╚╣╔╣╔╣║╚╣═╣ ╠╗║╚╝║║╠╗║╚╣║║║║║═╣ ╚═╩══╩═╩═╩═╩╝╚╩═╩═╝ 📌 Problem Summary: You're given a 2D image represented by a grid and a pixel position. The task is to "flood fill" the connected area of that pixel with a new color, replacing the original color. The goal is to traverse all connected pixels sharing the same color and apply the new color. 🔍 What You'll Learn in This Video: Understanding the Flood Fill algorithm and its real-world applications. DFS vs BFS approaches to solving grid-based problems. Writing clean and efficient recursive and iterative code. How to avoid common pitfalls such as infinite recursion or stack overflow. A step-by-step explanation of Leetcode 733 with visual grid examples. Building the right intuition for DSA problems that often appear in interviews. Tips for explaining your solution clearly in coding interviews. 💡 Why This Problem Is Important: Core DSA Concept: Grid traversal using DFS/BFS is foundational for many advanced problems. Interview Favorite: Frequently asked by companies like Amazon, Google, Facebook, and Microsoft. Visual Thinking: Enhances your ability to visualize recursion and problem state, a key interview skill. Real-World Application: Similar logic is used in paint-fill tools, map coloring, and game development. 🧠 Who Should Watch This? College students preparing for internships and placements. Aspiring software engineers preparing for coding interviews. Self-taught programmers building their foundations in DSA. Anyone working through Leetcode’s 75 Must-Do Problems. Beginner to Intermediate learners aiming to master recursion and graph-based logic. ✅ Approach Breakdown: Identify the base cases and constraints. Explore neighbors recursively or iteratively using DFS or BFS. Avoid re-visiting pixels using smart condition checks. Optimize for clean, readable code that’s easy to debug and explain. 🧮 Time and Space Complexity: Time Complexity: O(n × m), where n is the number of rows and m is the number of columns. Every pixel is visited at most once. Space Complexity: O(n × m) in worst-case for recursion stack or BFS queue. Leetcode 733,Flood Fill algorithm,DFS BFS tutorial,Leetcode solutions,Flood fill DFS,BFS grid traversal,Tech interview prep,DSA for beginners,Crack coding interviews,Leetcode Python solution,Recursion grid problem,Leetcode flood fill,Leetcode 733 Python,Graph traversal DSA,Flood fill explanation,FAANG coding questions,Leetcode must do problems,Grid based problems,Image fill algorithm,Coding interview tips,DSA grid problems #Leetcode733 #FloodFill #DSA #CodingInterview #TechInterviewPrep #DFS #BFS #GraphTraversal #LeetcodeSolution #DataStructures #Recursion #PythonCoding #DSAForBeginners #FAANGPrep #CodingPractice #InterviewQuestions #CodingTips #SoftwareEngineerPrep #LeetcodeTutorial #GridProblems This SEO content strategy is designed to: Leetcode 733 Flood Fill Explained – Step-by-Step Solution for Tech Interviews Leetcode 733: Flood Fill | DFS/BFS Explained | DSA Basics for Interview Prep Flood Fill (Leetcode 733) – Easy & Optimal Solution | Tech Interview Prep 2025 Leetcode 733 Solution | Master Flood Fill using DFS/BFS | DSA for Beginners Leetcode Flood Fill Problem (733) – Top Solution Using DFS | Beat Interviews! 733. Flood Fill – Crack It with DFS/BFS | Leetcode Solution + Code Learn Flood Fill Algorithm with Leetcode 733 | DSA & Coding Interview Prep Leetcode 733: Flood Fill – Explained for Beginners | DSA Must-Know Problem - Learn Java From Basics Playlist: https://www.youtube.com/watch?v=vkUTIhTuZyM&list=PL0zBvCLNlDwHSZYuHHMHerb02mmKC8tJe Instagram Handle: https://www.instagram.com/mohitchhabra_tech/ DISCLAIMER: All opinions shared on this channel are our own and don't express views or opinions of our employers. We only use our experiences and public knowledge to make our content. NO CONFIDENTIAL INFORMATION of our employers is used or shared on this channel.