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hackerrank-solutions

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My solutions to selected HackerRank challenges.

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# Solutions for selected HackerRank challenges

This repository contains my solutions to selected [HackerRank](https://www.hackerrank.com/) challenges. All of them solve the respective challenges with a score of 100%. Of course you should try to solve them yourself first and only use my solutions as guidance if you cannot do them on your own. GL&HF!

## 30 Days of Code

The 30 Days of Code challenges can be found [here](https://www.hackerrank.com/domains/tutorials/30-days-of-code). Once you have started this section, a new challenge will be release every day for your account. This is just a cosmetic feature and if you know the URL to the individual challenges, you can access them right away. I included those URLs as links in the table below, so that you don't have to wait, in case you'd like to progress faster than a single challenge per day.

Please note, that the solutions also contain the fixed stub code of the challenges, which cannot be changed. I didn't fix any code formatting or naming convention issues in those code blocks, so please do expect some weirdness in those areas, as the original stub code  provided by HackerRank isn't as clean as you would like it to be.

| Challenge                                                    | Python 3 Solution                                          |
| :----------------------------------------------------------- | :--------------------------------------------------------- |
| [Day 0: Hello, World.](https://www.hackerrank.com/challenges/30-hello-world) | [Day 0 - Solution](/30-days-of-code-python/day_00.py)      |
| [Day 1: Data Types](https://www.hackerrank.com/challenges/30-data-types) | [Day 1 - Solution](/30-days-of-code-python/day_01.py)      |
| [Day 2: Operators](https://www.hackerrank.com/challenges/30-operators) | [Day 2 - Solution](/30-days-of-code-python/day_02.py)      |
| [Day 3: Intro do Conditional Statements](https://www.hackerrank.com/challenges/30-conditional-statements) | [Day 3 - Solution](/30-days-of-code-python/day_03.py)      |
| [Day 4: Class vs. Instance](https://www.hackerrank.com/challenges/30-class-vs-instance) | [Day 4 - Solution](/30-days-of-code-python/day_04.py)      |
| [Day 5: Loops](https://www.hackerrank.com/challenges/30-loops) | [Day 5 - Solution](/30-days-of-code-python/day_05.py)      |
| [Day 6: Let's Review](https://www.hackerrank.com/challenges/30-review-loop) | [Day 6 - Solution](/30-days-of-code-python/day_06.py)      |
| [Day 7: Arrays](https://www.hackerrank.com/challenges/30-arrays) | [Day 7 - Solution](/30-days-of-code-python/day_07.py)      |
| [Day 8: Dictionaries and Maps](https://www.hackerrank.com/challenges/30-dictionaries-and-maps) | [Day 8 - Solution](/30-days-of-code-python/day_08.py)      |
| [Day 9: Recursion 3](https://www.hackerrank.com/challenges/30-recursion) | [Day 9 - Solution](/30-days-of-code-python/day_09.py)      |
| [Day 10: Binary Numbers](https://www.hackerrank.com/challenges/30-binary-numbers) | [Day 10 - Solution](/30-days-of-code-python/day_10.py)     |
| [Day 11: 2D Arrays](https://www.hackerrank.com/challenges/30-2d-arrays) | [Day 11 - Solution](/30-days-of-code-python/day_11.py)     |
| [Day 12: Inheritance](https://www.hackerrank.com/challenges/30-inheritance) | [Day 12 - Solution](/30-days-of-code-python/day_12.py)     |
| [Day 13: Abstract Classes](https://www.hackerrank.com/challenges/30-abstract-classes) | [Day 13 - Solution](/30-days-of-code-python/day_13.py)     |
| [Day 14: Scope](https://www.hackerrank.com/challenges/30-scope) | [Day 14 - Solution](/30-days-of-code-python/day_14.py)     |
| [Day 15: Linked List](https://www.hackerrank.com/challenges/30-linked-list) | [Day 15 - Solution](/30-days-of-code-python/day_15.py)     |
| [Day 16: Exceptions - String to Integer](https://www.hackerrank.com/challenges/30-exceptions-string-to-integer) | [Day 16 - Solution](/30-days-of-code-python/day_16.py)     |
| [Day 17: More Exceptions](https://www.hackerrank.com/challenges/30-more-exceptions) | [Day 17 - Solution](/30-days-of-code-python/day_17.py)     |
| [Day 18: Queues and Stacks](https://www.hackerrank.com/challenges/30-queues-stacks) | [Day 18 - Solution](/30-days-of-code-python/day_18.py)     |
| [Day 19: Interfaces](https://www.hackerrank.com/challenges/30-interfaces) | [Day 19 - Solution](/30-days-of-code-python/day_19.py)     |
| [Day 20: Sorting](https://www.hackerrank.com/challenges/30-sorting) | [Day 20 - Solution](/30-days-of-code-python/day_20.py)     |
| [Day 21: Generics](https://www.hackerrank.com/challenges/30-generics) | [Day 21 - Not solvable](/30-days-of-code-python/day_21.py) |
| [Day 22: Binary Search Trees](https://www.hackerrank.com/challenges/30-binary-search-trees) | [Day 22 - Solution](/30-days-of-code-python/day_22.py)     |
| [Day 23: BST Level-Order Traversal](https://www.hackerrank.com/challenges/30-binary-trees) | [Day 23 - Solution](/30-days-of-code-python/day_23.py)     |
| [Day 24: More Linked Lists](https://www.hackerrank.com/challenges/30-linked-list-deletion) | [Day 24 - Solution](/30-days-of-code-python/day_24.py)     |
| [Day 25: Running Time and Complexity](https://www.hackerrank.com/challenges/30-running-time-and-complexity) | [Day 25 - Solution](/30-days-of-code-python/day_25.py)     |
| [Day 26: Nested Logic](https://www.hackerrank.com/challenges/30-nested-logic) | [Day 26 - Solution](/30-days-of-code-python/day_26.py)     |
| [Day 27: Testing](https://www.hackerrank.com/challenges/30-testing) | [Day 27 - Solution](/30-days-of-code-python/day_27.py)     |
| [Day 28: RegEx, Patterns, and Intro to Databases](https://www.hackerrank.com/challenges/30-regex-patterns) | [Day 28 - Solution](/30-days-of-code-python/day_28.py)     |
| [Day 29: Bitwise AND](https://www.hackerrank.com/challenges/30-bitwise-and) | [Day 29 - Solution](/30-days-of-code-python/day_29.py)     |

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