Abstract Heresies

For day 17, we are emulating a small processor. The processor has 4 registers, a, b, and c, and a program counter. The program is an a...

For day 16, we are solving a maze. We want to find the lowest cost path from the start to the end. Taking a step straight ahead costs ...

For day 15, we are simulating moving crates around a warehouse. We are give a map of the warehouse which we will read into a grid, and ...

For day 14, we are given the initial positions and velocities of a number of robots that walk a 101x103 grid. These are parsed with a r...

For day 13, we're asked to find the solutions to some linear equations. We use the cl-ppcre library to parse the equations and the...

For day 12, we’re back to a grid of characters. Each character labels a region on the grid. ;;; -*- Lisp -*- (in-package "ADVENT2...

For day 11, we are given a list of stones inscribed with numbers. ;;; -*- Lisp -*- (in-package "ADVENT2024/DAY11") (defun re...