.gitignore 🔗
@@ -0,0 +1,4 @@
+*.beam
+*.ez
+/build
+erl_crash.dump
initial commit
Amolith created
Change summary
.gitignore | 4
AGENTS.md | 64
README.md | 40
crush.json | 19
gleam.toml | 22
input/day01.txt | 4147 +++++++++++++++++++++++++++++++++++++
input/day01_example.txt | 10
manifest.toml | 21
mix.exs | 15
src/aoc.gleam | 84
src/compare.gleam | 96
src/internal/llm/day01.gleam | 83
src/internal/mine/day01.gleam | 90
src/utils.gleam | 23
test/aoc_test.gleam | 39
15 files changed, 4,757 insertions(+)
Detailed changes
AGENTS.md 🔗
@@ -0,0 +1,64 @@
+# AGENTS.md
+
+Guidelines for AI agents working in this Advent of Code repository.
+
+## Project Overview
+
+Gleam-based Advent of Code solutions with two parallel implementation tracks (`mine/` and `llm/`) for comparing human vs LLM-generated solutions side-by-side with benchmarking.
+
+## Commands
+
+```console
+$ gleam build # Compile the project
+$ gleam test # Run all tests
+$ gleam run # Run all available days with comparison (default)
+$ gleam run -- <day> # Run specific day with comparison
+$ gleam run -- -e # Run with example input (--example)
+$ gleam run -- <day> -n # Run without comparison, mine/ only (--no-compare)
+$ gleam run -- 1 -en # Flags can be combined
+```
+
+## Code Organization
+
+```
+src/
+├── aoc.gleam # CLI entry point, argument parsing, day dispatch
+├── compare.gleam # Benchmarking harness for mine/ vs llm/ comparison
+├── utils.gleam # Input file reading utilities
+└── internal/
+ ├── mine/ # Human-written solutions
+ └── llm/ # LLM-generated solutions
+
+input/
+├── dayXX.txt # Real puzzle input
+└── dayXX_example.txt # Example input from problem description
+
+test/
+└── aoc_test.gleam # Tests for both implementations
+```
+
+## Documentation
+
+When making changes that affect CLI usage, project structure, or workflows, update the relevant documentation (this file and README.md) to reflect those changes.
+
+## Adding a New Day
+
+1. Create `src/internal/mine/dayXX.gleam` with `pub fn part1(input: List(String)) -> Int` and `pub fn part2(input: List(String)) -> Int` and bodies of just `todo`.
+2. Create `src/internal/llm/dayXX.gleam` with the same interface. Make sure to include the `//// Authored-by: [Model] via Crush` header that you're told to use for commits.
+3. Ask the user to paste the input for `input/dayXX_example.txt`, then download the contents of `https://adventofcode.com/2025/day/XX/input` to `input/dayXX.txt`.
+4. Wire up dispatch in `src/aoc.gleam`:
+ - Add import: `import internal/mine/dayXX as mine_dayXX`
+ - Add case to `run_parts`
+5. Wire up comparison in `src/compare.gleam`:
+ - Add imports for both implementations
+ - Add `pub fn dayXX(input: List(String)) -> Nil` function
+ - Add case to `run_comparison` in aoc.gleam
+6. Add the day number to `available_days` in `src/aoc.gleam`
+7. Add tests in `test/aoc_test.gleam`
+
+## Conventions
+
+- Naming: `mine_dayXX` and `llm_dayXX` for imports to distinguish implementations
+- Types: Define custom types for domain concepts (Movement, Rotation, etc.)
+- Constants: Use module-level `const` for magic numbers (e.g., `const starting_position = 50`)
+- Pipeline style: Heavy use of `|>` operator for data transformation
README.md 🔗
@@ -0,0 +1,40 @@
+# Advent of Code 2025 (Gleam)
+
+Includes parallel me- (`mine/`) and LLM- (`llm/`) generated implementations for
+side-by-side comparison. I'm using [Crush] and whatever models interest me. Each
+LLM-authored file includes a header indicating with model was the primary
+author.
+
+[Crush]: https://git.secluded.site/crush
+
+## Usage
+
+```console
+$ gleam run # Run all days with comparison (default)
+$ gleam run -- <day> # Run specific day with comparison
+$ gleam run -- -e # Run all days with example input
+$ gleam run -- <day> -n # Run specific day without comparison (mine/ only)
+$ gleam run -- <day> -en # Combine flags
+```
+
+## Results
+
+```console
+❯ gleam run
+ Compiled in 0.04s
+ Running aoc.main
+=== Day 1 ===
+Comparing implementations...
+
+--- Part 1 ---
+Mine: XXXX (5.3ms)
+LLM: XXXX (18.4ms)
+✓ Results match
+Mine 3.46x faster
+
+--- Part 2 ---
+Mine: XXXX (2.3ms)
+LLM: XXXX (17.3ms)
+✓ Results match
+Mine 7.50x faster
+```
crush.json 🔗
@@ -0,0 +1,19 @@
+{
+ "$schema": "https://charm.land/crush.json",
+ "lsp": {
+ "gleam": {
+ "command": "gleam",
+ "args": ["lsp"]
+ }
+ },
+ "mcp": {
+ "hexdocs": {
+ "type": "stdio",
+ "command": "hexdocs-mcp",
+ "env": {
+ "HEXDOCS_MCP_DEFAULT_EMBEDDING_MODEL": "manutic/nomic-embed-code",
+ "HEXDOCS_MCP_PATH": "$HOME/.config/hexdocs-mcp"
+ }
+ }
+ }
+}
gleam.toml 🔗
@@ -0,0 +1,22 @@
+name = "aoc"
+version = "1.0.0"
+
+# Fill out these fields if you intend to generate HTML documentation or publish
+# your project to the Hex package manager.
+#
+# description = ""
+# licences = ["Apache-2.0"]
+# repository = { type = "github", user = "", repo = "" }
+# links = [{ title = "Website", href = "" }]
+#
+# For a full reference of all the available options, you can have a look at
+# https://gleam.run/writing-gleam/gleam-toml/.
+
+[dependencies]
+gleam_stdlib = ">= 0.44.0 and < 2.0.0"
+argv = ">= 1.0.2 and < 2.0.0"
+simplifile = ">= 2.3.1 and < 3.0.0"
+birl = ">= 1.8.0 and < 2.0.0"
+
+[dev-dependencies]
+gleeunit = ">= 1.0.0 and < 2.0.0"
input/day01.txt 🔗
@@ -0,0 +1,4147 @@
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input/day01_example.txt 🔗
@@ -0,0 +1,10 @@
+L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82
manifest.toml 🔗
@@ -0,0 +1,21 @@
+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+ { name = "argv", version = "1.0.2", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "BA1FF0929525DEBA1CE67256E5ADF77A7CDDFE729E3E3F57A5BDCAA031DED09D" },
+ { name = "birl", version = "1.8.0", build_tools = ["gleam"], requirements = ["gleam_regexp", "gleam_stdlib", "ranger"], otp_app = "birl", source = "hex", outer_checksum = "2AC7BA26F998E3DFADDB657148BD5DDFE966958AD4D6D6957DD0D22E5B56C400" },
+ { name = "filepath", version = "1.1.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "B06A9AF0BF10E51401D64B98E4B627F1D2E48C154967DA7AF4D0914780A6D40A" },
+ { name = "gleam_regexp", version = "1.1.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_regexp", source = "hex", outer_checksum = "9C215C6CA84A5B35BB934A9B61A9A306EC743153BE2B0425A0D032E477B062A9" },
+ { name = "gleam_stdlib", version = "0.67.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "6368313DB35963DC02F677A513BB0D95D58A34ED0A9436C8116820BF94BE3511" },
+ { name = "gleam_yielder", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_yielder", source = "hex", outer_checksum = "8E4E4ECFA7982859F430C57F549200C7749823C106759F4A19A78AEA6687717A" },
+ { name = "gleeunit", version = "1.9.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "DA9553CE58B67924B3C631F96FE3370C49EB6D6DC6B384EC4862CC4AAA718F3C" },
+ { name = "ranger", version = "1.4.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "gleam_yielder"], otp_app = "ranger", source = "hex", outer_checksum = "C8988E8F8CDBD3E7F4D8F2E663EF76490390899C2B2885A6432E942495B3E854" },
+ { name = "simplifile", version = "2.3.1", build_tools = ["gleam"], requirements = ["filepath", "gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "957E0E5B75927659F1D2A1B7B75D7B9BA96FAA8D0C53EA71C4AD9CD0C6B848F6" },
+]
+
+[requirements]
+argv = { version = ">= 1.0.2 and < 2.0.0" }
+birl = { version = ">= 1.8.0 and < 2.0.0" }
+gleam_stdlib = { version = ">= 0.44.0 and < 2.0.0" }
+gleeunit = { version = ">= 1.0.0 and < 2.0.0" }
+simplifile = { version = ">= 2.3.1 and < 3.0.0" }
mix.exs 🔗
@@ -0,0 +1,15 @@
+defmodule Aoc.MixProject do
+ use Mix.Project
+
+ def project do
+ [
+ app: :aoc,
+ version: "1.0.0",
+ deps: deps()
+ ]
+ end
+
+ defp deps do
+ []
+ end
+end
src/aoc.gleam 🔗
@@ -0,0 +1,84 @@
+import argv
+import compare
+import gleam/int
+import gleam/io
+import gleam/list
+import gleam/option.{type Option, None, Some}
+import gleam/result
+import gleam/string
+import internal/mine/day01 as mine_day01
+import utils
+
+const available_days = [1]
+
+pub fn main() -> Nil {
+ let args = argv.load().arguments
+
+ case parse_args(args) {
+ Error(msg) -> io.println("Error: " <> msg)
+ Ok(#(day, example, cmp)) ->
+ case day {
+ Some(d) -> run_day(d, example, cmp)
+ None -> list.each(available_days, fn(d) { run_day(d, example, cmp) })
+ }
+ }
+}
+
+pub type Args {
+ Args(day: Option(Int), example: Bool, compare: Bool)
+}
+
+fn parse_args(
+ args: List(String),
+) -> Result(#(Option(Int), Bool, Bool), String) {
+ let example = list.contains(args, "--example") || list.contains(args, "-e")
+ let no_cmp =
+ list.contains(args, "--no-compare") || list.contains(args, "-n")
+ let day_args = list.filter(args, fn(a) { !string.starts_with(a, "-") })
+
+ use day <- result.try(case day_args {
+ [day_str, ..] ->
+ case int.parse(day_str) {
+ Ok(d) if d >= 1 && d <= 25 -> Ok(Some(d))
+ Ok(_) -> Error("day must be between 1 and 25")
+ Error(_) -> Error("invalid day number: " <> day_str)
+ }
+ [] -> Ok(None)
+ })
+
+ Ok(#(day, example, !no_cmp))
+}
+
+fn run_day(day: Int, example: Bool, cmp: Bool) -> Nil {
+ case utils.read_input(day, example) {
+ Error(e) -> io.println(e)
+ Ok(input) -> {
+ let mode = case example {
+ True -> " (example)"
+ False -> ""
+ }
+ io.println("=== Day " <> int.to_string(day) <> mode <> " ===")
+ case cmp {
+ True -> run_comparison(day, input)
+ False -> run_parts(day, input)
+ }
+ }
+ }
+}
+
+fn run_parts(day: Int, input: List(String)) -> Nil {
+ case day {
+ 1 -> {
+ io.println("Part 1: " <> int.to_string(mine_day01.part1(input)))
+ io.println("Part 2: " <> int.to_string(mine_day01.part2(input)))
+ }
+ _ -> io.println("Day " <> int.to_string(day) <> " not implemented yet")
+ }
+}
+
+fn run_comparison(day: Int, input: List(String)) -> Nil {
+ case day {
+ 1 -> compare.day01(input)
+ _ -> io.println("Day " <> int.to_string(day) <> " comparison not available")
+ }
+}
src/compare.gleam 🔗
@@ -0,0 +1,96 @@
+import birl
+import gleam/int
+import gleam/io
+import gleam/string
+import internal/llm/day01 as llm_day01
+import internal/mine/day01 as mine_day01
+
+pub type TimedResult {
+ TimedResult(result: Int, microseconds: Int)
+}
+
+fn time_fn(f: fn() -> Int) -> TimedResult {
+ let start = birl.now() |> birl.to_unix_micro
+ let result = f()
+ let end = birl.now() |> birl.to_unix_micro
+ TimedResult(result: result, microseconds: end - start)
+}
+
+fn format_time(microseconds: Int) -> String {
+ case microseconds {
+ us if us < 1000 -> int.to_string(us) <> "µs"
+ us if us < 1_000_000 -> {
+ let ms = us / 1000
+ let remainder = us % 1000
+ int.to_string(ms)
+ <> "."
+ <> string.pad_start(int.to_string(remainder / 100), 1, "0")
+ <> "ms"
+ }
+ us -> {
+ let s = us / 1_000_000
+ let ms = { us % 1_000_000 } / 1000
+ int.to_string(s)
+ <> "."
+ <> string.pad_start(int.to_string(ms), 3, "0")
+ <> "s"
+ }
+ }
+}
+
+fn print_comparison(part: String, mine: TimedResult, llm: TimedResult) -> Nil {
+ io.println("")
+ io.println("--- " <> part <> " ---")
+ io.println(
+ "Mine: "
+ <> int.to_string(mine.result)
+ <> " ("
+ <> format_time(mine.microseconds)
+ <> ")",
+ )
+ io.println(
+ "LLM: "
+ <> int.to_string(llm.result)
+ <> " ("
+ <> format_time(llm.microseconds)
+ <> ")",
+ )
+
+ let match = case mine.result == llm.result {
+ True -> "✓ Results match"
+ False -> "✗ Results differ!"
+ }
+ io.println(match)
+
+ let speedup = case mine.microseconds, llm.microseconds {
+ 0, 0 -> "Both too fast to measure"
+ m, _l if m == 0 -> "Mine too fast to measure"
+ _m, l if l == 0 -> "LLM too fast to measure"
+ m, l if m < l -> "Mine " <> format_speedup(l, m) <> " faster"
+ m, l if l < m -> "LLM " <> format_speedup(m, l) <> " faster"
+ _, _ -> "Same speed"
+ }
+ io.println(speedup)
+}
+
+fn format_speedup(slower: Int, faster: Int) -> String {
+ let ratio = { slower * 100 } / faster
+ let whole = ratio / 100
+ let frac = ratio % 100
+ int.to_string(whole)
+ <> "."
+ <> string.pad_start(int.to_string(frac), 2, "0")
+ <> "x"
+}
+
+pub fn day01(input: List(String)) -> Nil {
+ io.println("Comparing implementations...")
+
+ let mine_p1 = time_fn(fn() { mine_day01.part1(input) })
+ let llm_p1 = time_fn(fn() { llm_day01.part1(input) })
+ print_comparison("Part 1", mine_p1, llm_p1)
+
+ let mine_p2 = time_fn(fn() { mine_day01.part2(input) })
+ let llm_p2 = time_fn(fn() { llm_day01.part2(input) })
+ print_comparison("Part 2", mine_p2, llm_p2)
+}
src/internal/llm/day01.gleam 🔗
@@ -0,0 +1,83 @@
+//// Authored-by: Claude Opus 4.5 via Crush
+
+import gleam/int
+import gleam/list
+import gleam/result
+import gleam/string
+
+pub type Rotation {
+ Left(Int)
+ Right(Int)
+}
+
+fn parse_rotation(s: String) -> Result(Rotation, Nil) {
+ let s = string.trim(s)
+ case string.first(s) {
+ Ok("L") -> s |> string.drop_start(1) |> int.parse |> result.map(Left)
+ Ok("R") -> s |> string.drop_start(1) |> int.parse |> result.map(Right)
+ _ -> Error(Nil)
+ }
+}
+
+fn apply_rotation(position: Int, rotation: Rotation) -> Int {
+ let new_pos = case rotation {
+ Left(n) -> position - n
+ Right(n) -> position + n
+ }
+ // Wrap around 0-99 (100 positions)
+ { { new_pos % 100 } + 100 } % 100
+}
+
+pub fn part1(input: List(String)) -> Int {
+ let rotations = list.filter_map(input, parse_rotation)
+ let #(zero_count, _final_pos) =
+ list.fold(rotations, #(0, 50), fn(acc, rotation) {
+ let #(count, pos) = acc
+ let new_pos = apply_rotation(pos, rotation)
+ let new_count = case new_pos {
+ 0 -> count + 1
+ _ -> count
+ }
+ #(new_count, new_pos)
+ })
+ zero_count
+}
+
+fn count_zeros_crossed(position: Int, rotation: Rotation) -> Int {
+ let #(steps, going_right) = case rotation {
+ Left(n) -> #(n, False)
+ Right(n) -> #(n, True)
+ }
+
+ case going_right {
+ True -> {
+ // Right: hit 0 when (position + k) % 100 == 0
+ let first_hit = { 100 - position } % 100
+ case first_hit {
+ 0 -> steps / 100
+ f if f <= steps -> { steps - f } / 100 + 1
+ _ -> 0
+ }
+ }
+ False -> {
+ // Left: hit 0 when (position - k) % 100 == 0, i.e., k == position
+ case position {
+ 0 -> steps / 100
+ p if p <= steps -> { steps - p } / 100 + 1
+ _ -> 0
+ }
+ }
+ }
+}
+
+pub fn part2(input: List(String)) -> Int {
+ let rotations = list.filter_map(input, parse_rotation)
+ let #(zero_count, _final_pos) =
+ list.fold(rotations, #(0, 50), fn(acc, rotation) {
+ let #(count, pos) = acc
+ let zeros = count_zeros_crossed(pos, rotation)
+ let new_pos = apply_rotation(pos, rotation)
+ #(count + zeros, new_pos)
+ })
+ zero_count
+}
src/internal/mine/day01.gleam 🔗
@@ -0,0 +1,90 @@
+import gleam/int
+import gleam/list
+import gleam/result
+import gleam/string
+
+const starting_position = 50
+
+pub type Movement {
+ Left(Int)
+ Right(Int)
+}
+
+pub fn part1(input: List(String)) -> Int {
+ let movements = input |> list.filter_map(parse_movement)
+ let #(zero_count, _final_pos) =
+ list.fold(movements, #(0, starting_position), fn(acc, movement) {
+ let #(count, pos) = acc
+ let new_pos = apply_movement(pos, movement)
+ let new_count = case new_pos {
+ 0 -> count + 1
+ _ -> count
+ }
+ #(new_count, new_pos)
+ })
+ zero_count
+}
+
+pub fn part2(input: List(String)) -> Int {
+ let movements = input |> list.filter_map(parse_movement)
+ let #(zero_count, _final_pos) =
+ list.fold(movements, #(0, starting_position), fn(acc, movement) {
+ let #(count, pos) = acc
+ let new_pos = apply_movement(pos, movement)
+ let zeroes = zeroes_hit(pos, movement)
+ #(count + zeroes, new_pos)
+ })
+ zero_count
+}
+
+pub fn parse_movement(input: String) -> Result(Movement, Nil) {
+ case string.first(input) {
+ Ok("L") ->
+ input
+ |> string.drop_start(1)
+ |> int.parse
+ |> result.map(Left)
+ Ok("R") ->
+ input
+ |> string.drop_start(1)
+ |> int.parse
+ |> result.map(Right)
+ _ -> Error(Nil)
+ }
+}
+
+fn apply_movement(position: Int, movement: Movement) -> Int {
+ let new_pos = case movement {
+ Left(n) -> position - n
+ Right(n) -> position + n
+ }
+ // Wrap around 0-99 (100 positions)
+ { { new_pos % 100 } + 100 } % 100
+}
+
+fn zeroes_hit(position: Int, movement: Movement) -> Int {
+ let #(steps, going_right) = case movement {
+ Left(n) -> #(n, False)
+ Right(n) -> #(n, True)
+ }
+
+ case going_right {
+ True -> {
+ // Right: hit 0 when (position + k) % 100 == 0
+ let first_hit = { 100 - position } % 100
+ case first_hit {
+ 0 -> steps / 100
+ f if f <= steps -> { steps - f } / 100 + 1
+ _ -> 0
+ }
+ }
+ False -> {
+ // Left: hit 0 when (position - k) % 100 == 0, i.e., k == position
+ case position {
+ 0 -> steps / 100
+ p if p <= steps -> { steps - p } / 100 + 1
+ _ -> 0
+ }
+ }
+ }
+}
src/utils.gleam 🔗
@@ -0,0 +1,23 @@
+import gleam/int
+import gleam/string
+import simplifile
+
+/// Read input for a given day. If example is True, reads from dayXX_example.txt
+pub fn read_input(day: Int, example: Bool) -> Result(List(String), String) {
+ let day_str = int.to_string(day) |> string.pad_start(2, "0")
+ let suffix = case example {
+ True -> "_example"
+ False -> ""
+ }
+ let path = "input/day" <> day_str <> suffix <> ".txt"
+
+ case simplifile.read(path) {
+ Ok(content) ->
+ Ok(
+ content
+ |> string.trim
+ |> string.split("\n"),
+ )
+ Error(e) -> Error("failed to read " <> path <> ": " <> string.inspect(e))
+ }
+}
test/aoc_test.gleam 🔗
@@ -0,0 +1,39 @@
+import gleeunit
+import gleeunit/should
+import internal/llm/day01 as llm_day01
+import internal/mine/day01 as mine_day01
+import utils
+
+pub fn main() -> Nil {
+ gleeunit.main()
+}
+
+pub fn mine_day01_part1_example_test() {
+ let assert Ok(input) = utils.read_input(1, True)
+ mine_day01.part1(input)
+ |> should.equal(3)
+}
+
+pub fn mine_day01_part1_test() {
+ let assert Ok(input) = utils.read_input(1, False)
+ mine_day01.part1(input)
+ |> should.equal(1011)
+}
+
+pub fn llm_day01_part1_example_test() {
+ let assert Ok(input) = utils.read_input(1, True)
+ llm_day01.part1(input)
+ |> should.equal(3)
+}
+
+pub fn llm_day01_part1_test() {
+ let assert Ok(input) = utils.read_input(1, False)
+ llm_day01.part1(input)
+ |> should.equal(1011)
+}
+
+pub fn llm_day01_part2_example_test() {
+ let assert Ok(input) = utils.read_input(1, True)
+ llm_day01.part2(input)
+ |> should.equal(6)
+}