base on A pattern-based approach to learn technical interview questions # Leetcode Patterns [](https://github.com/seanprashad/leetcode-patterns/actions/workflows/github-pages.yml) [](https://github.com/seanprashad/leetcode-patterns/actions/workflows/run-cron.yml) ## Table of Contents - [Background](#background) - [Fundamentals](#fundamentals) - [Notes](#notes) - [Question List](#question-list) - [Solutions](#solutions) - [Suggestions](#suggestions) - [Acknowledgements](#acknowledgements) ## Background This repo is intended for any individual wanting to improve their problem solving skills for software engineering interviews. Problems are grouped under their respective subtopic, in order to focus on repeatedly applying common patterns rather than randomly tackling questions. All questions are available on [leetcode.com] with some requiring [leetcode premium]. ## Fundamentals To find the greatest amount of success when practicing, it is highly recommended to know the methods and runtimes of the following data structures and their operations: - Arrays - Maps - Linked Lists - Queues - Heaps - Stacks - Trees - Graphs In addition, you should have a good grasp on common algorithms such as: - Breadth-first search - Depth-first search - Binary search - Recursion ## Notes [This pdf] contains information for the main data structures in Java. Other useful methods to know include [`substring()`](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#substring-int-int-), [`toCharArray()`](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#toCharArray--), [`Math.max()`](https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#max-int-int-), [`Math.min()`](https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#min-int-int-), and [`Arrays.fill()`](https://docs.oracle.com/javase/8/docs/api/java/util/Arrays.html#fill-int:A-int-). ## Question List The entire question list can be found here: https://seanprashad.com/leetcode-patterns/. ## Solutions Solutions written in Java can be found in the [solutions] branch. ## Suggestions Think a question should/shouldn't be included? Wish there was another feature? Feel free to open an [issue] with your suggestion! ## Acknowledgements This list is heavily inspired from [Grokking the Coding Interview] with additional problems extracted from the [Blind 75 list] and this hackernoon article on [14 patterns to ace any coding interview question]. [leetcode.com]: https://leetcode.com [leetcode premium]: https://leetcode.com/subscribe/ [this pdf]: https://drive.google.com/open?id=1ao4ZA28zzBttDkuS6MLQI52gDs_CJZEm [solutions]: https://github.com/SeanPrashad/leetcode-patterns/tree/solutions [grokking the coding interview]: https://www.educative.io/courses/grokking-the-coding-interview [issue]: https://github.com/SeanPrashad/leetcode-patterns/issues/new [blind 75 list]: https://www.teamblind.com/article/New-Year-Gift---Curated-List-of-Top-100-LeetCode-Questions-to-Save-Your-Time-OaM1orEU?utm_source=share&utm_medium=ios_app [14 patterns to ace any coding interview question]: https://hackernoon.com/14-patterns-to-ace-any-coding-interview-question-c5bb3357f6ed ", Assign "at most 3 tags" to the expected json: {"id":"11428","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"