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Solutions for Advent of Code 2020 in Go, Java and Kotlin

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Overview

My solutions written in Golang, Java and Kotlin for Advent of Code 2020.

Disclaimer

Note that this code is hacky, not polished or refactored in any way, i.e. it is probably the worst spaghetti code you can imagine. Its sole purpose was to solve the puzzles, it should not be used as example for good code. That means, after I retrieved the correct solution for a puzzle, I left the source code as it is without any cleanup. Or stated otherwise, I intentionally gave myself the permission to hack around...

Day Problem Topic
1 Report Repair Simple equation solving
2 Password Philosophy Implement validation parser
3 Toboggan Trajectory Geometrical analysis on an infinite grid
4 Passport Processing Solve logic puzzle with interdependent variables
5 Binary Boarding Solve a SAT-based problem
6 Custom Customs Interdependent boolean expressions
7 Handy Haversacks Parse and compute recursive expressions
8 Handheld Halting Simulate simple CPU with self-modifying code
9 Encoding Error Numeric puzzle with large number of inputs
10 Adapter Array Computing and processing large number of permutations
11 Seating System Mixture of cellular automata and general 2D geometry
12 Rain Risk Simulate ship movements and relative computations
13 Shuttle Search Number theory (chinese remainder formula)
14 Docking Data Bitwise binary computations
15 Rambunctious Recitation Game simulation with intelligent caching
16 Ticket Translation Set-based combinatorial puzzle solving
17 Conway Cubes Simulating a 3D conway cube
18 Operation Order Parsing mathematical expressions
19 Monster Messages Parsing a BNF grammar
20 Jurassic Jigsaw Tile matching of a split and randomized image. This was probably one of the most difficult puzzles I've ever solved in AOC.
21 Allergen Assessment Breadth-First solver for pattern matching
22 Crab Combat Modulo-based array arithmetic
23 Crab Cups Circular linked list operations
24 Lobby Layout Cellular automata in a hexagonal grid
25 Combo Breaker Public key cryptography

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