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 [](https://algo.monster/) [Log In](https://algo.monster/login?signInSuccessUrl=%2F) [🎉 Unlock 50% off right now — claim your discount instantly\!](https://algo.monster/subscribe) # The Most Structured Way to Prepare for Coding Interviews Master key patterns to solve any interview question and gain the systematic knowledge you need to prove your expertise. [Get started for free](https://algo.monster/problems/stats) Join 1 million+ developers working in companies like  At AlgoMonster, we help you master the key patterns to solve any coding interview problem, save you time with our cutting-edge tools and highly optimized curriculum, and land your dream job with confidence. ## Explore the Most Common Interview Patterns Use AlgoMonster to learn the patterns. The internet has no short supply of problems, however like an unsolved puzzle it can be a daunting task to see the big picture and patterns. Luckily interviews are centered around a small set of patterns. These are repeated over and over. Learn these building blocks, you'll be able to apply them to any problem. [Top LeetCode Patterns Know exactly what to study next](https://algo.monster/problems/stats) [Binary Search A foolproof template for every binary search](https://algo.monster/problems/binary_search_intro) [Backtracking Template Learn Backtracking in 30 minutes or we pay](https://algo.monster/problems/backtracking) [Everything about Dynamic Programming The most comprehensive DP resource on the internet](https://algo.monster/problems/dynamic_programming_intro) [Explore more content](https://algo.monster/problems/stats) ## Systematically Solve Any Problem with AlgoMonster Flowchart We solved so many problems that we even created a flowchart to help you systematically solve any problem. This powerful tool guides you step-by-step to systematically break down and solve any coding problem—taking the guesswork out of interview preparation and helping you feel confident and ready. ## What is it? The AlgoMonster flowchart, developed by ex-Googlers and competitive programmers, is based on solving thousands of problems and identifying common patterns. Its purpose is to provide a structured method for solving coding problems. ## How to use it? Internal nodes (diamonds) are decisions based on problem descriptions. Leaf nodes (purple boxes) are the algorithms you would need to solve the problem. Traverse the tree from the root until you reach a leaf node, and that is the algorithm you need to solve the problem. Select a node to see more explanations, or watch the video below for a walkthrough. ## Do I memorize this? This is a common question, and the answer is NO. The flowchart is a tool and a reference to help you understand the patterns. As you work through problems using the flowchart, you will naturally get better at recognizing the patterns. "Education is not the learning of facts, but the training of the mind to think." Practice and you shall learn. No memorization needed\! ## What else is there? The flowchart is just one tool; there are many other tools and techniques to help you solve problems. - If you like quick references, check out the [runtime to algo cheatsheet](https://algo.monster/problems/runtime_summary). - If you like to get an overview of how patterns can help you learn and prepare for interviews faster, check out the [pattern-based learning](https://algo.monster/problems/stats). - If you want to jump right in to start learning a pattern, check out the [binary search intro](https://algo.monster/problems/binary_search_intro). ## AlgoMonster Pro Finally, may I suggest checking out the limited time offer on [AlgoMonster Pro](https://algo.monster/subscribe) to get everything you need to master the interview and land your dream job. yes yes no yes no no no yes yes no yes yes yes no yes yes no no yes yes yes yes yes no no yes no yes no yes yes no no yes no yes no yes no yes no yes no yes no yes no no yes Is it a graph? Is it a tree? DFS Is problem related to directed acyclic graphs? Topological Sort Is the problem related to shortest paths? Is the graph Weighted? Dijkstra's Algorithm BFS Does the problem involve connectivity Disjoint Set Union Does the problem have small constraints? DFS/backtracking BFS Need to solve for kth smallest/largest? Heap / Sortings Involves Linked Lists? Two pointers Small constraint bounds? Is brute force fast enough? Brute force / Backtracking Dynamic Programming About subarrays or substrings? Deals with sums or additive Prefix Sums Sliding Window Calculating max/min of something? Monotonic condition? Can be split into sub-problems? Greedily calculate answer? Binary Search Dynamic Programming Greedy Algorithms Asking for number of ways? Is brute force fast enough? Brute Force / Backtracking Dynamic Programming Multiple sequences? Monotonic conditions? Can split into sub-problems? Two pointers Dynamic Programming Find or enumerate indices? Monotonic Condition? Two pointers O(1) memory required Involves monotonic condition? Two pointers Do you need to parse symbols? Stack Press enter or space to select a node.You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel. Press enter or space to select an edge. You can then press delete to remove it or escape to cancel. [Learn More About the Flowchart](https://algo.monster/flowchart) ## Ready to land your dream job? Unlock your dream job with a 5- minute evaluator for a personalized learning plan\! [Start Quiz](https://algo.monster/evaluator) ## Tools to Boost your Learning Speed Mastering algorithms takes time and effort—but with AlgoMonster, you don't have to go it alone. Our cutting-edge tools are designed to streamline your learning process, helping you grasp concepts faster and maximize your prep time. Get the support you need to boost your learning speed and confidence Inline IDE, AI Assisted Learn a concept and practice it right away in the web page. Have AI help clearing any remaining doubt or debug your code.  Templates Knowing which pattern to use is half the battle. The other half is to always write bug-free code. Our templates help you do just that, every time.  Speedrun Once you have a good grasp of the fundamentals, what you need is to expand your horizon. Write the full code of each problem takes time. Go through problems quickly with the speedrun feature.  ### Algorithm Visualizer Watch algorithms execute step-by-step with animated pointers, code highlighting, and interactive controls. Try it yourself—adjust the input and hit play. arr Reset comma-separated integers target Reset comma-separated integers Corner cases: Example 1 Example 2 Already at ends VISUALIZATION Show Code Full Screen 1x 2 / 16 Compute arr\[l\] + arr\[r\] l↓ r↓ 2 0 3 1 4 2 5 3 8 4 11 5 18 6 Call Stack twoSumSorted l:0 r:6 target:8 two\_sum:20 Was this helpful? 👍 👎 [Try More Visualizations](https://algo.monster/problems/two_sum_sorted) *** ## Personalized Learning with AI Everyone learns differently, and with AlgoMonster, you'll never be left behind. Thanks to AI, personalized learning is now a reality. Select any text on our platform, and our AI will break it down and explain it in a way that's easy to understand—no matter where you're starting from. Start learning smarter today—your way. Select any text on AlgoMonster's platform and have AI explain it until you understand it.  ## Ready to land your dream job? Unlock your dream job with a 5 \-minute evaluator for a personalized learning plan\! [Start Quiz](https://algo.monster/evaluator) ## AlgoMonster learners have inspiring stories to tell "You changed my life. Failing a bunch of online assessments when you have no idea how other people are doing it is so heartbreaking. Back when my mental model is of leetcode problems being all ad-hoc and there being no point to working that much at them because they are all different. Changed that whole thing up singlehandedly with algomonster, made me realize how easy it all is. Can't thank you enough!"  Ram Software Engineer at Meta “I am 42 years old and I hadn't touched the subject of algorithms and data structures since college time, when I had learned it in a very limited way. For more than 1 year, I tried to study on my own without a guidance, and I regret all the precious time I lost in this journey, as it was completely unproductive. Then, I found AlgoMonster. Using the guidance provided on the website, I felt the time I reserved for studying was being completely better applied, and in 1 month I had advanced more than I had in one year. After a while, I got the job I wanted at Amazon Alexa and I owe big part of it to AlgoMonster, and even now I still want to keep using it, as I started enjoying the contents! Thanks Sheldon for creating Algo Monster, it was decisive in my journey!”  Marcelo Senior SDE at Amazon [](https://www.linkedin.com/in/mvallebr/) “Dear Algo Monster Team, I hope this message finds you well. I am writing to express my sincere gratitude for the incredible work your team has put into creating such a fantastic platform. As a computer science student, I have been using your resources to deepen my understanding of data structures and algorithms. Your clear, descriptive explanations have been invaluable in helping me grasp complex concepts quickly and solidify my understanding. The structured approach you follow and the practical examples provided on your website have made a significant impact on my learning journey. I can confidently say that my knowledge and problem-solving abilities have greatly improved thanks to the comprehensive materials you offer. Thank you once again for making this knowledge accessible to students like me. Your efforts are truly appreciated, and I look forward to continuing to learn with Algo Monster. Mahesh Mhanta”  Mahesh Computer Science Student [](https://www.linkedin.com/in/mahesh-mhanta-926187234/) [See more love](https://algo.monster/love) ## Ready to land your dream job? Unlock your dream job with a 5 \-minute quiz for a personalized learning plan\! [Start Quiz](https://algo.monster/evaluator) ## FAQ How does this compare to Leetcode? \+ Anyone who has done Leetcode from scratch can understand the struggle to get started. Being presented with 3000+ coding problems can be daunting and overwhelming. Luckily almost all the problems can be condensed to a set of patterns, which are repeated over and over. All you need to learn are these building blocks, and be able to apply them to new problems. We have done the leg work of summarizing the patterns and building it into an interactive platform, so you can get up to speed as fast as possible. Think of it as it A\* path-finding algorithm with AlgoMonster heuristics. Checkout the [statistics](https://algo.monster/problems/stats) we used to compile the patterns. Do you have instructional videos? \+ We have found videos to be suboptimal for learning algorithms because they are less interactive, and do not push you to think. And you really have to think when it comes to learning complex subjects like algorithms. Video is also difficult to glance through and jump around. It's often useful to go back and forth over a new concept. Kind of like how it's easier to read on a physical book than on a Kindle, it's often easier to have all the information easily accessible. Also, watching videos loses the interactivity that is built into our notebook-style articles. That being said, we do realize some people learn best with videos, so we are working on adding them. Check out our [YouTube channel](https://www.youtube.com/@algo.monster) for video content. How does AlgoMonster compare to academic courses, like Princeton's course on Coursera? \+ Tech interviews focus on a specific set of topics. Princeton's algorithm course on Coursera places emphasis on complex academic topics, e.g. Prim's Algorithm, Krushkal's Algorithm for spanning trees, Bellman-Ford etc. These are very rarely, if ever, asked in coding interviews. It may be good intellectual practice, but usually it is not relevant. How does AlgoMonster compare to XXX List of LeetCode Questions? \+ The lists you see floating around the internet are just questions to practice. You still have to figure out how to solve them yourself, summarize and derive the intuitions to solve more problems. AlgoMonster does all the heavy lifting for you. Just as Isaac Newton professed, we enable you to stand on the shoulders of giants. What if I get stuck? \+ We have a **Teaching Assistant** feature, an AI that is trained on all our content. You can ask it questions, ChatGPT-style, and it should answer most of your questions. If you still need help, you can always ask on our [discussion forum](https://discuss.algo.monster/) or [Discord](https://discord.gg/NzM4te47DT). What can I expect to get from AlgoMonster? \+ If you put in the time to learn the material on AlgoMonster, you should be able to solve most of the problems on Leetcode and understand the discussion forums. Most importantly, you will be ready to interview for almost any coding role. How do I sign up? \+ [Get Started](https://algo.monster/login)  © 2024 AlgoMonster. All rights reserved [](https://www.youtube.com/@algo.monster)[](https://discord.com/invite/nHmdZjQ) ##### About [About Us](https://algo.monster/about)[Contact](mailto:support@algo.monster)[Terms of service](https://algo.monster/terms_and_conditions.html)[Pricing](https://algo.monster/subscribe) ##### Resources [System Design Interview](https://systemdesignschool.io/)[The AlgoMonster Flowchart](https://algo.monster/flowchart)[Interview Guides](https://algo.monster/interview-guides)[Blind75](https://algo.monster/blind75)[Monster50](https://algo.monster/monster50)[AlgoMonster vs LeetCode vs Designguru vs NeetCode vs AlgoExpert](https://algo.monster/blog/platform-comparison) ##### Contribute [Affiliate Program](https://algo.firstpromoter.com/)[Referral Credits](https://algo.monster/referral-invite)

Master key patterns to solve any interview question and gain the systematic knowledge you need to prove your expertise. [Get started for free](https://algo.monster/problems/stats) Join 1 million+ developers working in companies like  At AlgoMonster, we help you master the key patterns to solve any coding interview problem, save you time with our cutting-edge tools and highly optimized curriculum, and land your dream job with confidence. ## Explore the Most Common Interview Patterns Use AlgoMonster to learn the patterns. The internet has no short supply of problems, however like an unsolved puzzle it can be a daunting task to see the big picture and patterns. Luckily interviews are centered around a small set of patterns. These are repeated over and over. Learn these building blocks, you'll be able to apply them to any problem. [Explore more content](https://algo.monster/problems/stats) ## Systematically Solve Any Problem with AlgoMonster Flowchart We solved so many problems that we even created a flowchart to help you systematically solve any problem. This powerful tool guides you step-by-step to systematically break down and solve any coding problem—taking the guesswork out of interview preparation and helping you feel confident and ready. ## What is it? The AlgoMonster flowchart, developed by ex-Googlers and competitive programmers, is based on solving thousands of problems and identifying common patterns. Its purpose is to provide a structured method for solving coding problems. ## How to use it? Internal nodes (diamonds) are decisions based on problem descriptions. Leaf nodes (purple boxes) are the algorithms you would need to solve the problem. Traverse the tree from the root until you reach a leaf node, and that is the algorithm you need to solve the problem. Select a node to see more explanations, or watch the video below for a walkthrough. ## Do I memorize this? This is a common question, and the answer is NO. The flowchart is a tool and a reference to help you understand the patterns. As you work through problems using the flowchart, you will naturally get better at recognizing the patterns. "Education is not the learning of facts, but the training of the mind to think." Practice and you shall learn. No memorization needed\! ## What else is there? The flowchart is just one tool; there are many other tools and techniques to help you solve problems. - If you like quick references, check out the [runtime to algo cheatsheet](https://algo.monster/problems/runtime_summary). - If you like to get an overview of how patterns can help you learn and prepare for interviews faster, check out the [pattern-based learning](https://algo.monster/problems/stats). - If you want to jump right in to start learning a pattern, check out the [binary search intro](https://algo.monster/problems/binary_search_intro). ## AlgoMonster Pro Finally, may I suggest checking out the limited time offer on [AlgoMonster Pro](https://algo.monster/subscribe) to get everything you need to master the interview and land your dream job. yes yes no yes no no no yes yes no yes yes yes no yes yes no no yes yes yes yes yes no no yes no yes no yes yes no no yes no yes no yes no yes no yes no yes no yes no no yes Is it a graph? Is it a tree? DFS Is problem related to directed acyclic graphs? Topological Sort Is the problem related to shortest paths? Is the graph Weighted? Dijkstra's Algorithm BFS Does the problem involve connectivity Disjoint Set Union Does the problem have small constraints? DFS/backtracking BFS Need to solve for kth smallest/largest? Heap / Sortings Involves Linked Lists? Two pointers Small constraint bounds? Is brute force fast enough? Brute force / Backtracking Dynamic Programming About subarrays or substrings? Deals with sums or additive Prefix Sums Sliding Window Calculating max/min of something? Monotonic condition? Can be split into sub-problems? Greedily calculate answer? Binary Search Dynamic Programming Greedy Algorithms Asking for number of ways? Is brute force fast enough? Brute Force / Backtracking Dynamic Programming Multiple sequences? Monotonic conditions? Can split into sub-problems? Two pointers Dynamic Programming Find or enumerate indices? Monotonic Condition? Two pointers O(1) memory required Involves monotonic condition? Two pointers Do you need to parse symbols? Stack [Learn More About the Flowchart](https://algo.monster/flowchart) ## Ready to land your dream job? Unlock your dream job with a 5- minute evaluator for a personalized learning plan\! [Start Quiz](https://algo.monster/evaluator) ## Tools to Boost your Learning Speed Mastering algorithms takes time and effort—but with AlgoMonster, you don't have to go it alone. Our cutting-edge tools are designed to streamline your learning process, helping you grasp concepts faster and maximize your prep time. Get the support you need to boost your learning speed and confidence Inline IDE, AI Assisted Learn a concept and practice it right away in the web page. Have AI help clearing any remaining doubt or debug your code.  Templates Knowing which pattern to use is half the battle. The other half is to always write bug-free code. Our templates help you do just that, every time.  Speedrun Once you have a good grasp of the fundamentals, what you need is to expand your horizon. Write the full code of each problem takes time. Go through problems quickly with the speedrun feature.  ### Algorithm Visualizer Watch algorithms execute step-by-step with animated pointers, code highlighting, and interactive controls. Try it yourself—adjust the input and hit play. arrcomma-separated integers targetcomma-separated integers Corner cases: 2 / 16 Compute arr\[l\] + arr\[r\] l↓ r↓ 2 0 3 1 4 2 5 3 8 4 11 5 18 6 twoSumSorted l:0 r:6 target:8 two\_sum:20 Was this helpful? *** ## Personalized Learning with AI Everyone learns differently, and with AlgoMonster, you'll never be left behind. Thanks to AI, personalized learning is now a reality. Select any text on our platform, and our AI will break it down and explain it in a way that's easy to understand—no matter where you're starting from. Start learning smarter today—your way. Select any text on AlgoMonster's platform and have AI explain it until you understand it.  ## Ready to land your dream job? Unlock your dream job with a 5 \-minute evaluator for a personalized learning plan\! [Start Quiz](https://algo.monster/evaluator) ## AlgoMonster learners have inspiring stories to tell "You changed my life. Failing a bunch of online assessments when you have no idea how other people are doing it is so heartbreaking. Back when my mental model is of leetcode problems being all ad-hoc and there being no point to working that much at them because they are all different. Changed that whole thing up singlehandedly with algomonster, made me realize how easy it all is. Can't thank you enough!"  Ram Software Engineer at Meta “I am 42 years old and I hadn't touched the subject of algorithms and data structures since college time, when I had learned it in a very limited way. For more than 1 year, I tried to study on my own without a guidance, and I regret all the precious time I lost in this journey, as it was completely unproductive. Then, I found AlgoMonster. Using the guidance provided on the website, I felt the time I reserved for studying was being completely better applied, and in 1 month I had advanced more than I had in one year. After a while, I got the job I wanted at Amazon Alexa and I owe big part of it to AlgoMonster, and even now I still want to keep using it, as I started enjoying the contents! Thanks Sheldon for creating Algo Monster, it was decisive in my journey!”  Marcelo Senior SDE at Amazon [](https://www.linkedin.com/in/mvallebr/) “Dear Algo Monster Team, I hope this message finds you well. I am writing to express my sincere gratitude for the incredible work your team has put into creating such a fantastic platform. As a computer science student, I have been using your resources to deepen my understanding of data structures and algorithms. Your clear, descriptive explanations have been invaluable in helping me grasp complex concepts quickly and solidify my understanding. The structured approach you follow and the practical examples provided on your website have made a significant impact on my learning journey. I can confidently say that my knowledge and problem-solving abilities have greatly improved thanks to the comprehensive materials you offer. Thank you once again for making this knowledge accessible to students like me. Your efforts are truly appreciated, and I look forward to continuing to learn with Algo Monster. Mahesh Mhanta”  Mahesh Computer Science Student [](https://www.linkedin.com/in/mahesh-mhanta-926187234/) [See more love](https://algo.monster/love) ## Ready to land your dream job? Unlock your dream job with a 5 \-minute quiz for a personalized learning plan\! [Start Quiz](https://algo.monster/evaluator) FAQ Anyone who has done Leetcode from scratch can understand the struggle to get started. Being presented with 3000+ coding problems can be daunting and overwhelming. Luckily almost all the problems can be condensed to a set of patterns, which are repeated over and over. All you need to learn are these building blocks, and be able to apply them to new problems. We have done the leg work of summarizing the patterns and building it into an interactive platform, so you can get up to speed as fast as possible. Think of it as it A\* path-finding algorithm with AlgoMonster heuristics. Checkout the [statistics](https://algo.monster/problems/stats) we used to compile the patterns. We have found videos to be suboptimal for learning algorithms because they are less interactive, and do not push you to think. And you really have to think when it comes to learning complex subjects like algorithms. Video is also difficult to glance through and jump around. It's often useful to go back and forth over a new concept. Kind of like how it's easier to read on a physical book than on a Kindle, it's often easier to have all the information easily accessible. Also, watching videos loses the interactivity that is built into our notebook-style articles. That being said, we do realize some people learn best with videos, so we are working on adding them. Check out our [YouTube channel](https://www.youtube.com/@algo.monster) for video content. Tech interviews focus on a specific set of topics. Princeton's algorithm course on Coursera places emphasis on complex academic topics, e.g. Prim's Algorithm, Krushkal's Algorithm for spanning trees, Bellman-Ford etc. These are very rarely, if ever, asked in coding interviews. It may be good intellectual practice, but usually it is not relevant. The lists you see floating around the internet are just questions to practice. You still have to figure out how to solve them yourself, summarize and derive the intuitions to solve more problems. AlgoMonster does all the heavy lifting for you. Just as Isaac Newton professed, we enable you to stand on the shoulders of giants. We have a **Teaching Assistant** feature, an AI that is trained on all our content. You can ask it questions, ChatGPT-style, and it should answer most of your questions. If you still need help, you can always ask on our [discussion forum](https://discuss.algo.monster/) or [Discord](https://discord.gg/NzM4te47DT). If you put in the time to learn the material on AlgoMonster, you should be able to solve most of the problems on Leetcode and understand the discussion forums. Most importantly, you will be ready to interview for almost any coding role.