tginsberg / advent-2023-kotlin

🎄 Advent of Code 2023: Solutions in Kotlin

Advent of Code 2023 Solutions in Kotlin

This repo is my personal attempt at solving the Advent of Code 2023 set of problems with the Kotlin programming language.

In previous years I have attempted to solve each puzzle on the day they were posted and to blog my solutions. However, given the enormous amount of time that takes, I will not be blogging my solutions this year. I will still attempt to solve each puzzle each day with a nice solution in Kotlin.

Past years, also in Kotlin:

• 2017 - GitHub and Blog Posts
• 2018 - GitHub and Blog Posts
• 2019 - GitHub and Blog Posts
• 2020 - GitHub and Blog Posts
• 2021 - GitHub and Blog Posts
• 2022 - GitHub and Blog Posts

Day	Title	Blog Link	Solution Code	Puzzle Text
1	Trebuchet?!	Blog/Commentary	Code	AoC
2	Cube Conundrum	Blog/Commentary	Code	AoC
3	Gear Ratios	Blog/Commentary	Code	AoC
4	Scratchcards	Blog/Commentary	Code	AoC
5	If You Give A Seed A Fertilizer	Blog/Commentary	Code	AoC
6	Wait For It	Blog/Commentary	Code	AoC
7	Camel Cards	Blog/Commentary	Code	AoC
8	Haunted Wasteland	Blog/Commentary	Code	AoC
9	Mirage Maintenance	Blog/Commentary	Code	AoC
10	Pipe Maze	Blog/Commentary	Code	AoC
11	Cosmic Expansion	Blog/Commentary	Code	AoC
12	Hot Springs	Blog/Commentary	Code	AoC
13	Point of Incidence	Blog/Commentary	Code	AoC
14	Parabolic Reflector Dish	Blog/Commentary	Code	AoC
15	Lens Library	Blog/Commentary	Code	AoC
16	The Floor Will Be Lava	Blog/Commentary	Code	AoC
17	Clumsy Crucible	Blog/Commentary	Code	AoC
18	Lavaduct Lagoon	Blog/Commentary	Code	AoC
19	Aplenty	Blog/Commentary	Code	AoC
20	Pulse Propagation	Blog/Commentary	Code	AoC
21	Step Counter	Blog/Commentary	Code	AoC
22	Sand Slabs	Blog/Commentary	Code	AoC
23	A Long Walk	Blog/Commentary	Code	AoC
24	Never Tell Me The Odds	Blog/Commentary	Code	AoC
25	Snowverload	Blog/Commentary	Code	AoC

Copyright © 2023 by Todd Ginsberg.

advent-2023-kotlin's Issues

Day 17 does not work for all inputs

advent-2023-kotlin/src/main/kotlin/com/ginsberg/advent2023/Day17.kt

Line 46 in 98b628b

State(Point2D(0, 0), EAST, 0).apply {

Hi, I struggled to find the correct solution for part 2. I finally gave up and looked at your code. However, your code produced the same wrong result for my input. I then looked around a bit more and finally realized that for my input, the first step is going south and not east! Thus, adding 2 starting steps to the queue solved the issue.
Thus, I would think you need to use something like

listOf(EAST, SOUTH).map { State(Point2D(0, 0), it, 0) }.forEach {
    queue += Work(it, 0)
    seen += it
}