ARCHIVED: USE advent-of-code instead

This repo has been archived use https://github.com/matt-gretton-dann/advent-of-code instead, which contains multiple years of Advent of Code.

C++ Solutions to Advent of Code 2015

This repository contains solutions to the Advent of Code 2015 Advent puzzles. All solutions are written in C++. The solutions aren't designed to be nice or pretty. Instead I am using it as an experiment in understanding how I approach solving problems.

Each Puzzle lies in its own directory named puzzle-<day>-<number>.

The solutions are authored by Matthew Gretton-Dann, and Copyright 2020, Matthew Gretton-Dann. Licensed under Apache 2.0 - see license.

Building

The build system uses CMake.

git clone https://github.com/matt-gretton-dann/advent-of-code-2015/
cd advent-of-code-2015
cmake -Bbuild -S.
cmake --build build

Note that some of the puzzles require OpenSSL for the MD5 implementation. On macOS this also requires you to pass an appropariate value for OPENSSL_ROOT_DIR to cmake. On x86 this is -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl and on AArch64 this is -DOPENSSL_ROOT_DIR=/opt/homebrew/opt/openssl.

To run each puzzle then do:

DAY=01
PUZZLE=01
INPUT=input1.txt
./driver.sh $DAY $PUZZLE $INPUT

Sources

All code is written in C++.

Directory Layout

Each puzzle is in a self-contained directory puzzle-DAY-NUMBER.

Within the directory there are the following files:

• Mandatory: CMakeLists.txt which contains the build instructions. Executable should be called puzzle-DAY-NUMBER. See below for the expected command-line interface.
• Optional: exampleNN.txt. The example given in the problem description
• Optional: driver.sh. Driver program to use if you can't just call the executable.
• Optional: *.cc: C++ sources.

Command Line Interface

The executable command line interface should just take the input in on standard-input and print its result on standard-output.

If this is not possible the script driver.sh within the directory should be provided (and made executable). It should take two arguments - the executable to run and the input file to use.