Advent of FPGA 2025

My solutions for Advent of FPGA 2025, written in OCaml using Hardcaml.

Building

This project uses the oxcaml compiler and Jane Street's opam repository.

Prerequisites

• opam 2.x
• System dependencies: libgmp-dev, libffi-dev, pkg-config, zlib1g-dev

On Ubuntu/Debian:

sudo apt-get install libgmp-dev libffi-dev pkg-config zlib1g-dev

Setup

1. Add the oxcaml opam repository:

opam repo add ox https://github.com/oxcaml/opam-repository.git

2. Create a switch with the oxcaml compiler:

opam switch create . ocaml-variants.5.2.0+ox

3. Install dependencies:

opam install . --deps-only

Build

dune build

Run tests

dune runtest

Run on manual inputs

First, populate inputs/. Make sure the file names are in the format day{DD}.txt. Then run dune exec bin/run_day{DD}.exe. Replace DD with your day.