LeetCode Was Hard Until I Learned THESE 8 Patterns (With Templates!)

[@yashshukla1637]

- **Introduction:** - 8 important patterns for coding interviews split into two categories: - **Linear structures:** arrays, linked lists, strings. - **Nonlinear structures:** trees, graphs. - Focus on pre-built code templates for these patterns. - **Linear Data Structure Patterns:** 1. **Two Pointers:** - Reduces time complexity to linear time \(O(n)\). - Two methods: - Same direction: used for scanning data in a single pass (e.g., fast and slow pointers to detect cycles or find middle elements). - Opposite directions: used for finding pairs (e.g., sum of two numbers in a sorted array). 2. **Sliding Window:** - Refines two pointers to manage a window of elements dynamically. - Expands or contracts the window to meet specific conditions (e.g., longest substring without repeating characters). - Often combined with hashmaps. 3. **Binary Search:** - Efficiently finds target in logarithmic time \(O(\log n)\). - Extends to lists with monotonic conditions, not just sorted numbers. - Example: finding the minimum in a rotated sorted array. - **Nonlinear Data Structure Patterns:** 4. **Breadth-First Search (BFS):** - Explores nodes level by level. - Uses a queue to keep track of visited nodes (ideal for level order traversal). 5. **Depth-First Search (DFS):** - Dives deep into one path before exploring others. - Often uses recursion and is memory efficient for exploring all paths. - Example: counting islands in a grid. 6. **Backtracking:** - Extension of DFS, explores all possible solutions. - Builds the solution dynamically by making decisions and backtracking on invalid paths. - Example: letter combinations of a phone number. - **Heaps (Priority Queue):** 7. **Heaps:** - Used for questions related to top K, K smallest/largest. - **Min Heap:** smallest value at the root. - **Max Heap:** largest value at the root. - Max Heap is used to find K smallest values, and vice versa for K largest. - **Dynamic Programming (DP):** 8. **Dynamic Programming:** - Optimizes solutions by breaking problems into overlapping subproblems. - Two approaches: - **Top-down:** recursive with memoization to store results. - **Bottom-up:** solves smaller subproblems iteratively using a table. - Too complex for this video but covered in-depth on their website.

[@xEveNxThExOdds]

one of the best videos on the topic i’ve seen, thank you

[@ytrg1]

Excellent! Thank you so much for this video. All of the data structures can be overwhelming to remember, you breaking them down into categories, with their use cases, and providing templates was so useful.

[@sahiljain5979]

thanks a lot man. never thought of solving leetcode as templates .this is really helpful.

[@stanrobertson]

Thanks for the update, Anna! It is great that you are sharing your experience so that others can have hope.

[@KushLemon]

Wtf are you blabbering about?

[@nathsai1658]

Absolutely loved this video! Thanks a lot!

[@manishmahajan6094]

wow ! this gave so much clarity

[@skazahay]

17:54: Does this only apply to solutions where you limit the max size of the heap to k? Couldn’t you use a full-size minHeap, then pop k elements to get the same result of the k smallest numbers? I’m assuming there’s a reasoning behind it that I’m missing. Thank you for the content, this has been very helpful in studying.

[@iamsaranhere]

Best if the best like 3b1b in Math ,your animations is in whole other league bro for dsa

[@sushibot12]

Thanks for making this.

[@PranavRPise]

This is what I was looking for!

[@Aman-xo4yx]

Very helpful bro!

[@ricardosilva3482]

Regarding Binary Search for the "Find Minimum in Rotated Sorted Array" problem, I'm a bit unsure if the boolean array approach works. For example, if we have the rotated array of [50, 60, 70, 80, 90, 10, 20, 30, 40], wouldn't the approach return 20 instead of 10?

[@brandonbraner]

well this video worked, just signed up for the black Friday special :)

[@ivmmos]

Much appreciation from self-learner!👍

[@existentialism_01]

hey man, am self-learner aswell, wanna collaborate?

[@jaskiratsood1643]

Thank you so much.

[@pravinprince3221]

Thank you so much sir for the wonderful video

[@Salah-YT]

thank u so much

[@Website_TV_1]

Struggling with LeetCode? Not anymore! 🚀 These 8 patterns and templates are game-changers for tackling even the toughest problems! 🤯 I wish I learned these earlier - it would have saved me HOURS of frustration. If you're aiming to ace your coding interviews, this video is a MUST-WATCH! 🧑‍💻✨ ⚡ Pro tip: Stick around till the end for an epic bonus! 💡 time stamp: 0:00 - Intro 0:49 - Two Pointers 2:29 - Sliding Window 4:20 - Binary Search 7:34 - BFS 10:08 - DFS 13:08 - Backtracking 16:58 - Priority Queue (Heap) 19:01 - Dynamic Programming

[@Apollon609]

what the fudge are you saying at 9:16

[@IceGamerification]

where do i check this stuff out again?

[@algo.monster]

algo.monster/

[@rohan637]

Unable to buy your course from India. It say "Merchant is non-compliant with RBI guidelines for recurring payments and e-mandate". And yes I have international payments on on my card

[@algo.monster]

Hey Rohan, thanks so much for letting us know. Which bank are you using? There is an issue with subscription in India since we are a foreign entity. Could you send us an email at [e-mail] and we can look into it.

[@PanicAtProduction]

Awesome!

[@algo.monster]

Thank you! Cheers!

[@aliadel1723]

Best Platform

[@robbyoconnor]

16:38 The background music is a huge mistake... it's very relaxing

[@nadeem-cp9is]

great video

[@kayalvizhi3624]

Is any one tell me.. Learning dsa is useful for careee or not?

[@algo.monster]

It's probably the single highest return-on-investment activity you could do for a tech career, opens so many doors once we you master it

[@chandantalreja08]

Thank you so much

[@kishorpustake6682]

I can't think logic of an easy leetcode problems can't solve a single easy leetcode problem till now from 2 years I m learning 😖😖😖

[@nishantsharma8824]

but there are no jobs what would i do after learning all this?

[@datastatacian]

yes. learning for fun.

[@algo.monster]

I hear you-things are tough right now, but the pendulum always swings in both directions. The tech industry (like any other industry) has its ups and downs, but it always picks back up. By building your skills now, you'll be ready to seize opportunities when the market improves. Watch this video on this topic: kzbin.info/www/bejne/b3LJppuknc5kgLM

[@ritik4293]

This content was never about learning or memorizing things just for getting jobs , it's something that if you truly understand and are curious about can help you solve problems that can help you create your own company...!

[@TheSwden]

This is like multi level preaching. You can teach others and they can teach others and they can teach others....

[@TheSwden]

​@@ritik4293kya bhai.. Kuch b

[@roushanv]

Absolutely, i just don't remember how many times i have been asked binary search like finding indices of the numbers repeated in a sorted array 😂

[@AmitNayekamit006]

In `DFS` function 16:07 path.pop() never execute.

[@mobiledevelopmentmastery2024]

Could you share some discount for your subscription?

[@GauravSrivastava-c5q]

dont know why but feel little bit of confident by seeing some medium level could be solved by patterns

[@TheGIQ123]

For the TF question (binary search) you forgot to stipulate that the input only has false, then true (can’t do TFTF) Also, the vocal AI had a hiccup at the 9m mark lmao

[@algo.monster]

input has to be monotonic, which mens F(0) cannot go after T(1)

[@ml_serenity]

Leetcode has nothing to do with the real-world programming in 99% of cases.

[@rickyc46]

Wrong

[@ml_serenity]

@rickyc46 tell me more about it.

[@aakashsrivastava5557]

Please wake up

[@melophylic7469]

I mean when you need to build scalable applications it will be used. Relational databases, pathfinding algorithms, making filters, recommendation algorithms, etc. But non-scalable ones don't really need them ig.

[@ml_serenity]

@@melophylic7469 Inventing algorithms? Cool. Most of us professional programmers don't ever do that stuff.

[@omai225]

This video is very misleading. Important information is left out and some of the examples used don’t really demonstrate the full use of the patterns. The template code is also very clunky. It almost seems like the person narrating the video hasn’t grinded any Leetcode problems before. Is this what you can expect of algomonster?

[@crockz0r]

it's a 20 minutes video, what would you expect?

[@omai225]

@ does it being 20 mins change what I said?