2019.20.org

Day 20

Executing this code

If you have a lisp installation, emacs, org-mode, and org-babel support for lisp installed you can run this by:

1. Starting slime (M-x slime)
2. Typing C-c C-c in the block initialize.
3. In the repl type (in-package :aoc-2019-20)
4. Typing C-c C-c in the block answers

Initial stuffs

Packages to load

(unless (find-package :cl-ppcre)
  (ql:quickload "cl-ppcre"))
(unless (find-package :iterate)
  (ql:quickload "iterate"))
(unless (find-package :parseq)
  (ql:quickload "parseq"))
(unless (find-package :fiveam)
  (ql:quickload "fiveam"))
(unless (find-package :series)
  (ql:quickload "series"))
(unless (find-package :cl-permutation)
  (ql:quickload "cl-permutation"))
(unless (find-package :bordeaux-threads)
  (ql:quickload "bordeaux-threads"))

Create package for this day

<<packages>>
(defpackage :aoc-2019-20
  (:use :common-lisp
        :iterate
        :parseq
        :fiveam)
  (:export :problem-a
           :problem-b))
(in-package :aoc-2019-20)

Input

(defun read-input (file)
  (iter (for line in-file file using #'read-line)
        (collect line)))

(defparameter *input*
  (read-input "input/20.txt"))

Part 1

(defun problem-a () (format t "Problem 20 A: ~a~%" (identity *input*)))

Part 2

(defun problem-b () (format t "Problem 20 B: ~a~%" (identity *input*)))

Putting it all together

<<read-input>>
<<input>>

<<initialize>>
<<structs>>
<<functions>>
<<input>>
<<problem-a>>
<<problem-b>>
(problem-a)
(problem-b)

Answer

Problem 4a: 101194
Problem 4b: 102095

Test Cases

(def-suite aoc.2019.20)
(in-suite aoc.2019.20)

(run! 'aoc.2019.20)

Test Results

Thoughts