🦌🎅🏻⛄🎁 Advent of Code (AoC) ☃️❄️🤶🎄

Overview of the years

• AoC '15 in Haskell (2 ⭐ out of 50 ⭐)
• AoC '16
• AoC '17
• AoC '18
• AoC '19
• AoC '20
• AoC '21
• AoC '22 in Haskell and C++ (approx. 2/3 completed)
• AoC '23 in Haskell (approx. 2/3 completed)
• AoC '24 in Haskell, Rust and C++ (35 ⭐ out of 50 ⭐)
• AoC '25 in Haskell (in progress)
• AoC '26 (yet to come)

Programming languages used

Why Haskell?

The progamming language Haskell is very well suited for mathematical notions, pure computations and and has a terse syntax. It's often marketed as "an advanced, purely functional programming language", that is declarative and statically typed.

• Haskell

Sometimes, however, one needs stateful computations with e. g. arrays that are better expressed in an imperative language like C++.

Why C++?

I use C++ first and foremost because I'm too lazy to use C which would require me to implement a lot of data structures and algorithms myself.

Since I'm at least as lazy as Haskell, I use therefore sometimes C++, too.

If not necessary, I don't write object oriented code.

Why Rust?

Rust is a good tradeoff between imperative and functional programming:

• Rust

But for AoC '25 I'll do it only in Haskell.

About Advent of Code

Some nice videos about AoC on YouTube:

• Keynote: Advent of Code, Behind the Scenes - Eric Wastl @ CppNorth,
• Eric Wastl – Advent of Code: Behind the Scenes.