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Correl Roush dcb5bcf148 Day 5: Doesn't He Have Intern-Elves For This?

2015-12-11 13:11:45 -05:00

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Advent of Code

Day 1: Not Quite Lisp
- Part 2
Day 2: I Was Told There Would Be No Math
- Part 2
Day 3: Perfectly Spherical Houses in a Vacuum
- Part 2
Day 4: The Ideal Stocking Stuffer
- Part 2
Day 5: Doesn't He Have Intern-Elves For This?

Day 1: Not Quite Lisp

Santa was hoping for a white Christmas, but his weather machine's "snow" function is powered by stars, and he's fresh out! To save Christmas, he needs you to collect fifty stars by December 25th.

Collect stars by helping Santa solve puzzles. Two puzzles will be made available on each day in the advent calendar; the second puzzle is unlocked when you complete the first. Each puzzle grants one star. Good luck!

Here's an easy puzzle to warm you up.

Santa is trying to deliver presents in a large apartment building, but he can't find the right floor - the directions he got are a little confusing. He starts on the ground floor (floor 0) and then follows the instructions one character at a time.

An opening parenthesis, (, means he should go up one floor, and a closing parenthesis, ), means he should go down one floor.

The apartment building is very tall, and the basement is very deep; he will never find the top or bottom floors.

For example:

(()) and ()() both result in floor 0.
((( and (()(()( both result in floor 3.
))((((( also results in floor 3.
()) and ))( both result in floor -1 (the first basement level).
))) and )())()) both result in floor -3.

To what floor do the instructions take Santa?

((((()(()(((((((()))(((()((((()())(())()(((()((((((()((()(()(((()(()((())))()((()()())))))))))()((((((())((()))(((((()(((((((((()()))((()(())()((())((()(()))((()))()))()(((((()(((()()))()())((()((((())()())()((((())()(()(()(((()(())(()(())(((((((())()()(((())(()(()(()(())))(()((((())((()))(((()(()()(((((()()(()(((()(((((())()))()((()(()))()((()((((())((((())(()(((())()()(()()()()()(())((((())((())(()()))()((((())))((((()())()((((())((()())((())(())(((((()((((()(((()((((())(()(((()()))()))((((((()((())()())))(((()(()))(()()(()(((()(()))((()()()())((()()()(((())())()())())())((()))(()(()))(((((()(()(())((()(())(())()((((()())()))((((())(())((())())((((()(((())(())((()()((((()((((((()(())()()(()(()()((((()))(())()())()))(())))(())))())()()(())(()))()((()(()(())()()))(()())))))(()))(()()))(())(((((()(()(()()((())()())))))((())())((())(()(())((()))(())(((()((((((((()()()(()))()()(((()))()((()()(())(())())()(()(())))(((((()(())(())(()))))())()))(()))()(()(((((((()((((())))())())())())()((((((((((((((()()((((((()()()())())()())())())(())(())))())((()())((()(()))))))()))))))))))))))))())((())((())()()))))))(((()((()(()()))((())(()()))()()())))(())))))))(()(((())))())()())))()()(())()))()(()))())((()()))))(()))))()))(()()(())))))))()(((()))))()(()))(())())))))()))((()))((()))())(())))))))))((((())()))()))()))())(())()()(())))())))(()())()))((()()(())))(())((((((()(())((()(((()(()()(())))()))))))()))()(()((()))()(()))(()(((())((((())())(())(()))))))))())))))))())())))))())))))()()(((())()(()))))))))())))))(())()()()))()))()))(()(())()()())())))))))())()(()(()))))()()()))))())(()))))()()))))()())))))(((())()()))(()))))))))))()()))))()()()))))(()())())()()())()(()))))()(()))(())))))))(((((())(())())()()))()()))(())))))()(()))))(())(()()))()())()))()))()))()))))())()()))())())))(()))(()))))))())()(((())()))))))))()))()())))())))())))()))))))))))()()))(()()))))))(())()(()))))())(()))))(()))))(()())))))())())()()))))())()))))))))(()))))()))))))()(()())))))))()))())))())))())))())))))))())(()()))))))(()())())))()())()))))))))))))))())))()(())))()))())()()(())(()()))(())))())()())(()(()(()))))())))))))))))())(()))()))()))))(())()())()())))))))))))()()))))))))))))())())))))(()())))))))))))())(())))()))))))))())())(()))()))(())))()))()()(())()))))))()((((())()))())())))))()))()))))((()())()))))())))(())))))))))))))))))()))))()()())()))()()))))())()))((()())))())))(()))(()())))))))()))()))))(())))))))(())))))())()()(()))())()))()()))))())()()))))())()))())))))))(()))))()())()))))))))(()))())))(()))()))))(())()))())())(())())())))))))((((())))))()))()))()())()(())))()))()))()())(()())()()(()())()))))())())))))(()))()))))())(()()(())))))(())()()((())())))))(())(())))))))())))))))))()(())))))))()())())())()(()))))))))(()))))))))())()()))()(()))))))()))))))())))))))(())))()()(())()())))))(((())))()((())()))())))(()()))())(())())))()(((()())))))()(()()())))()()(()()(()()))())()(()()()))())()()))()())(()))))())))))())))(())()()))))(()))))(())(()))(())))))()()))()))))())()))()()(())())))((()))())()))))))()()))))((()(()))))()()))))))())))))())(()((()())))))))))))()())())))()))(()))))))(()))(())()())))(()))))))))())()()()()))))(()())))))))((())))()))(()))(())(())()())()))))))))(())))())))(()))()()))(()()))(()))())))()(())))())((()((()(())))((())))()))))((((())())()())))(())))()))))))())(()()((())))())()(()())))))(()())()))())))))))((())())))))))(()(()))())()()(()()(((()(((()())))))()))))))()(())(()()((()()(())()()))())()())()))()())())())))))))(((())))))))()()))))))(((())()))(()()))(()()))))(()(()()((((())()())((()()))))(()(())))))()((()()()())()()((()((()()))(()))(((()()()))(((())))()(((())()))))))((()(())())))(()())(((((()(()))(()((()))(()())()))))(()(()))()(()))(())(((())(()()))))()()))(((()))))(()()()()))())))((()()()(())()))()))))()()))()))))))((((((()()()))))())((()()(((()))))(()(())(()()())())())))()(((()()))(())((())))(()))(()()()())((())())())(()))))()))()((()(())()(()()(())(()))(())()))(())(()))))(())(())())(()()(()((()()((())))((()))()((())))(((()()()()((((()))(()()))()()()(((())((())())(()()(()()()))()((())(())()))())(((()()(())))()((()()())()())(()(())())(((())(())())((())(())()(((()()))(())))((())(()())())(())((()()()((((((())))((()(((((())()))()))(())(()()))()))(())()()))(())((()()())()()(()))())()((())))()((()()())((((()())((())())())((()((()))()))((())((()()(()((()()(((())(()()))))((()((())()(((())(()((())())((())(()((((((())())()(()())()(())(((())((((((()(())(()((()()()((()()(()()()())))()()(((((()()))()((((((()))()(()(()(()(((()())((()))())()((()))(())))()))()()))())()()))())((((())(()(()))(((((((())(((()(((((()(((()()((((())(((())())))(()()()(()(()))()))((((((()))((()(((()(())((()((((()((((((())(((((())))(((()(()))))(((()(((())()((())(()((()))(((()()(((())((((()(()(((((()))(((()(((((((()(()()()(()(()(()()())(())(((((()(())())()())(()(()(()))()(()()()())(()()(()((()))()((())())()(()))((())(()))()(()))()(((()(()(()((((((()()()()())()(((((()()(((()()()((()(((((()))((((((((()()()(((((()))))))(()()()(())(()))(()()))))(())()))(((((()(((((()()(()(()())(((()))((((()((()(()(()((()(()((())))()(((()((()))((()))(((((((((()((()((()(())))()((((()((()()))((())(((()(((((()()(()(()()((()(()()()(((((((())())()())))))((((()()(()))()))(()((())()(()(((((((((()()(((()(()())(()((()())((())())((((()(((()(((()((((()((()((((()(()((((((())((((((((((((()()(()()((((((((((((((()((()()))()((((((((((((())((((()(()())((()(()(()))()(((((()()(((()()))()())(())((()(((((()((())(((((()((()(((((()))()()((((())()((((())(((((((((()(())(()(())))())(()((())(((())(())(())())(()(()(())()()((()((())()(((()(((((()(())))()(((()((())))((()()()(((()(((()((()(()(())(()((()())(()(()(((()(((((((((())(()((((()()))(()((((()()()()(((()((((((((()(()()((((((()(()()(()((()((((((((((()()(((((((()())(())))(((()()))(((((()((()()())(()()((((())((()((((()))))(())((()(()()(((()(()(((()((((()(((((()))())())(()((())()))(((()())((())((())((((()((()((((((())(()((((()()))((((((())()(()))((()(((())((((((((((()()(((((()(((((()((()()()((((())))(()))()((()(())()()((()((((((((((()((())(())(((((()(()(()()))((((()((((()()((()(((()(((((((((()(()((()((()))((((((()(((())()()((()(((((((()())))()()(()((()((()()(((()(()()()()((((()((())((((()(((((((((()(((()()(((()(()(((()(((()((())()(()((()(()(()(()))()(((()))(()((((()((())((((())((((((())(()))(()((((())((()(()((((((((()()((((((()(()(()()()(())((()((()()(((()(((((((()()((()(((((((()))(((((()(((()(()()()(()(((()((()()((())(()(((((((((()(()((()((((((()()((())()))(((((()((())()())()(((((((((((()))((((()()()()())(()()(()(()()))()))(()))(()(((()()))())(()(()))()()((())(()())()())()(()))()))(()()(()((((((())((()(((((((((((()(())()((()(()((()((()(()((()((((((((((()()())((())()(())))((())()())()(((((()(()())((((()((()(())(()))(((())()((()))(((((())(()))()()(()))(((())((((()((((()(())))(((((((()))))())()())(())((())()(()()((()(()))()(()()(()()((()())((())((()()))((((()))()()))(()()(())()()(((((()(())((()((((()))()))(()())())(((()()(()()))(())))))(()))((())(((((()((((()))()((((()))()((())(((())))(((()())))((()(()()((

  (defun day1/parse-directions (directions)
    (seq-map
                   (lambda (char)
                     (cond ((eq char ?\() 1)
                           ((eq char ?\)) -1)
                           (t 0)))
                   directions))

  (seq-reduce #'+
              (day1/parse-directions input)
              0)

Part 2

Now, given the same instructions, find the position of the first character that causes him to enter the basement (floor -1). The first character in the instructions has position 1, the second character has position 2, and so on.

For example:

) causes him to enter the basement at character position 1.
()()) causes him to enter the basement at character position 5.

What is the position of the character that causes Santa to first enter the basement?

  (defun day1/steps-until (predicate reduce-fn sequence initial-value)
    (car (seq-reduce
          (lambda (acc next)
            (let ((counter (car acc))
                  (value (cdr acc)))
              (if (funcall predicate value) acc
                (cons (+ 1 counter)
                      (funcall reduce-fn value next)))))
          sequence
          (cons 0 initial-value))))

  (day1/steps-until
   (lambda (floor) (= floor -1))
   #'+
   (day1/parse-directions input)
   0)

Day 2: I Was Told There Would Be No Math

The elves are running low on wrapping paper, and so they need to submit an order for more. They have a list of the dimensions (length l, width w, and height h) of each present, and only want to order exactly as much as they need.

Fortunately, every present is a box (a perfect right rectangular prism), which makes calculating the required wrapping paper for each gift a little easier: find the surface area of the box, which is 2*l*w + 2*w*h + 2*h*l. The elves also need a little extra paper for each present: the area of the smallest side.

For example:

A present with dimensions 2x3x4 requires 2*6 + 2*12 + 2*8 = 52 square feet of wrapping paper plus 6 square feet of slack, for a total of 58 square feet.
A present with dimensions 1x1x10 requires 2*1 + 2*10 + 2*10 = 42 square feet of wrapping paper plus 1 square foot of slack, for a total of 43 square feet.

All numbers in the elves' list are in feet. How many total square feet of wrapping paper should they order?

  (defun day2/surface-area (w h l)
    "Calculate the surface area of a box."
    (+ (* 2 l w)
       (* 2 w h)
       (* 2 h l)))

  (defun day2/slack (w h l)
    "Find the area of the smallest side of a box.

  The smallest side is the side with the smallest area."
    (min (* l w)
         (* w h)
         (* h l)))

  (defun day2/wrapping-paper (w h l)
    "Find the area of wrapping paper needed to wrap a box."
    (+ (day2/surface-area w h l)
       (day2/slack w h l)))

  (ert-deftest day2/wrapping-paper ()
    (should (eq 58 (day2/wrapping-paper 2 3 4)))
    (should (eq 43 (day2/wrapping-paper 1 1 10))))

  (defun day2/parse-dimensions (dimension-string)
    "Parse a string representing the dimensions of a box separated
  by the character 'x' into a list of integers."
    (seq-map #'string-to-int
             (split-string dimension-string "x")))

  (defun day2/sum-list (input)
    (seq-reduce
     #'+
     (seq-map (lambda (dimension-string)
                (let ((dimensions (day2/parse-dimensions dimension-string)))
                  (eval (cons 'day2/wrapping-paper dimensions))))
              (split-string input))
     0))

  (ert-deftest day2/sum-list ()
    (let ((test-data (string-join '("2x3x4" "1x1x10") "\n")))
      (should (eq (+ 58 43)
                  (day2/sum-list test-data)))))

  (day2/sum-list input)

Part 2

The elves are also running low on ribbon. Ribbon is all the same width, so they only have to worry about the length they need to order, which they would again like to be exact.

The ribbon required to wrap a present is the shortest distance around its sides, or the smallest perimeter of any one face. Each present also requires a bow made out of ribbon as well; the feet of ribbon required for the perfect bow is equal to the cubic feet of volume of the present. Don't ask how they tie the bow, though; they'll never tell.

For example:

A present with dimensions 2x3x4 requires 2+2+3+3 = 10 feet of ribbon to wrap the present plus 2*3*4 = 24 feet of ribbon for the bow, for a total of 34 feet.
A present with dimensions 1x1x10 requires 1+1+1+1 = 4 feet of ribbon to wrap the present plus 1*1*10 = 10 feet of ribbon for the bow, for a total of 14 feet.

How many total feet of ribbon should they order?

  (defun day2/smallest-perimeter (w h l)
    (min (* 2 (+ l w))
         (* 2 (+ w h))
         (* 2 (+ h l))))

  (defun day2/volume (w h l)
    (* w h l))

  (defun day2/ribbon (w h l)
    (+ (day2/smallest-perimeter w h l)
       (day2/volume w h l)))

  (ert-deftest day2/ribbon ()
    (should (eq 34 (day2/ribbon 2 3 4)))
    (should (eq 14 (day2/ribbon 1 1 10))))

  (defun day2/sum-ribbon (input)
    (seq-reduce
     #'+
     (seq-map (lambda (dimension-string)
                (let ((dimensions (day2/parse-dimensions dimension-string)))
                  (eval (cons 'day2/ribbon dimensions))))
              (split-string input))
     0))

  (day2/sum-ribbon input)

Day 3: Perfectly Spherical Houses in a Vacuum

Santa is delivering presents to an infinite two-dimensional grid of houses.

He begins by delivering a present to the house at his starting location, and then an elf at the North Pole calls him via radio and tells him where to move next. Moves are always exactly one house to the north (^), south (v), east (>), or west (<). After each move, he delivers another present to the house at his new location.

However, the elf back at the north pole has had a little too much eggnog, and so his directions are a little off, and Santa ends up visiting some houses more than once. How many houses receive at least one present?

For example:

> delivers presents to 2 houses: one at the starting location, and one to the east.
^>v< delivers presents to 4 houses in a square, including twice to the house at his starting/ending location.
^v^v^v^v^v delivers a bunch of presents to some very lucky children at only 2 houses.

  >^^v^<>v<<<v<v^>>v^^^<v<>^^><^<<^vv>>>^<<^>><vv<<v^<^^><>>><>v<><>^^<^^^<><>>vv>vv>v<<^>v<>^>v<v^<>v>><>^v<<<<v^vv^><v>v^>>>vv>v^^^<^^<>>v<^^v<>^<vv^^<^><<>^>><^<>>><><vv><>v<<<><><>v><<>^^^^v>>^>^<v<<vv^^<v<^<^>^^v^^^^^v<><^v><<><^v^>v<<>^<>^^v^<>v<v^>v>^^<vv^v><^<>^v<><^><v^><><><<<<>^vv^>^vvvvv><><^<vv^v^v>v<<^<^^v^<>^<vv><v<v^v<<v<<^^>>^^^v^>v<><^vv<<^<>v<v><><v^^><v<>^^>^^>v^>^<<<<v><v<<>v><^v>^>><v^^<^>v<vvvv<>>>>>^v^^>v<v<^<vv>^>^vv^>vv^^v<<^<^^<>v>vv^v>><>>>v^>^>^^v<>^<v<<>^vv>v^<<v>v<<><v>^vvv<v<vvv^v<vv<v^^^>v><<^<>><v^^>^v^>>^v<^<><v<>>v^<>>v<>>v^^^><^>>vvvv>^v<^><<>>^<>^>vv><v<<>>^^>v^^^><^<<^^v>v<^<<>v>^^vvv^v^>v^<>^^<>v^v>v>v<v^>vv>^^v<>v>>^<>><>v>v^<<vvvv<vvv><v^<^>^v<>>^><v>><>^<v>v<v>vv^>>vvv<>v>v<v^>>^>>v<<>^<>^<>>>^v<<<^<^v>vv^>><<><v^>^v^^^v<>^^vv><>><>>^>v^<v<>v<>>^<<^v>^^^<>^v^><>v<<v>vv^>vv<<>>><<^v^<>v<vv>>>^^<>^><<^>vv>>^<<v^^vv<>>><v>v><^<v<<>>>^^<>>^<^v><>vv^^^v>vvv>^><<>^^>^<<v^<v<^v<<>vvv<^<<>^>^v<vv<^>vvv>v>vv^<v^><>>^vv<^^^vv><^vv<v^<><v^vvv><<^>^^><v<<vv^>v<vv<v>^<>^v<<>v<v^v^>^>^>v<<^vvv<<<v>^^>^<<<<>vv>>^<>^>>>v<v>^^<v^<v<>>>vv>^^v<<>>>^^v><<<v<v<^v<>^^><v<^v<<v^><><^<><v<^^v>>><v^^v<<v^><^<><<v^>><^<>v>v^<><^<v>^v^>^>^vv^>^^<<vv^>vv<^vvv<>>^^<^>v^>^>^<v^><v<v>>>v<<<><^v<<><^<vv^v^^^>v<^^<v^vvv<v<><v<vv<^vv<>vv<v^<>>vvvvv<<>^v^v>vv>>>vvv^^<^<^<><>v<v>><^v><^<<<>><<<v>^>v<>^>^v>>^<>v^<^>><<>^<v>^>^^^>^^<v>>>><>^v^v><<<<vv^<vv<>vv>v<>v^<v^>v><>>>v^<><^vvv>vv^<^<<^<^^v>^>>>v<^<^v^^<^<^>>><v>vv>^<<><>^>>v>^<<>><^<>v<>vv^^>^>vvv^v<<^<^^<vv<>^vvv<^^v^vv^>>v<^>^^<v^<>v<^<^vv>v<<vv>vv>^>vvv>>>^^>v<>^v>v^<^>>v>^^v>>>>v^<v>v<^>v<v<<>>^v<^^<v><^<>>^<<vv^>>v<<v>^v<>><^>vv<v<^>>^^<vvvvvvvvv>>>v<v<>v^<>>^vv<v^^v<<^vvv^<<^><>vv<><<>>v>vv^><>>^^v^>>v^v^><<<>>^^<^v<<^<>>>>^<^>v^><<^>v<^v<^>>^^<<<<><^<^v^v<>>^v<^<<vv^<><^^vv><v^v^v>^>>^>^vv^>^v<v^v<<vvv^><>>^v^^><>v>vv><^>>vv<vvv<<<<^<>vvv^v<v>^<v<^>^<^<v<><>v^^^^<<vv<^^vv<v>><<v^><>>><v^>^v><^>^><vv^<><^<v>><<^vv<>>v^<<v<>v><v<><><vv>^>>v^<^<v>^><>>><^><v^v<>>>^^<^>v<v>vvv<>^<<><v^^>^>>v<^v>^>v>>>vv>v>>v^^^<^<vvv^<>^>^<v^<v^v>v>^>vv>vvv<>v<^>v>^^>>^<vv^^v>v^^^^^v^vv><^<><>^>vv<^>>^vvvv^^^>^<vv>^v<<^><^^>^<>^^>^<<v<^>>>^><<^^>v^v>>^>vvvv>^^v><v>>vv><<<vv<^>v>^^^<v>v^vvv<^><<^>^<>^><<<<<v^<<vv^v>^<>v<v>^>^>><>v^v<^vv^^>vv<<v^v>vv^vvv<<<<>^v<v^^v^v>v<<v>^^<>^vv^^>^>^v^vv^>>v^vv^^<vv><<v^v^^v><vv<^vvv<vv^^<<v>v^v^^^^v<^<^>v>^>v>^vv^v^^<v<^vvvv<<<>^<^^^<^^<>^<><vv<^^<<^>>><v^vvvv>^<>>^^>v^^v^<<v^^^<<<><^<v^v^^v<v^<>v><<v<>^v>v<^><^>vv^^<vvv<^v>>v>^<><v^><^^^<v^>>vv<<<<<^<>^v^v>^vv^<>v>v<^>vv<<^vv>vv<v<><>>v>><v<^<^^>><<v^v<<^><v<^<vv<v<<vv^>^<<><^^>^<^>>^<vv>><v<<vvv<^^v^>^^<^v>^v<v<>v><v^v^<<^<><<v<<^v>v<<>>^>v>>v>>v<^<<^<^>>>v>^^^v><^>^^>>v<<>^v><v>vvv^vv<<<>vvv<<>^>>>v<v<v^<^<^>^<^>v^^v<^^<v<>v<>>^^>^v^>v<<<<^<>v^><<<v>>>><<v^<^vv>v>><>>^<<<^<^^>v<>>v<>vv<<^<<><<^>v^^^vv^>vvvv>>v>v^><<v<>vv^<<><<vvv>^>>>^<<<^<^<<v>^>v<>>v>>vv^^><<<<^^^v>><<^><v><v^^><v<<v^^v^^v>>v<><><<>^><v><^<vv>><^v<>v<vvv<>^>><v>>v<^><<v>^<>^v><^><^^<v>^><^^v^<<><>>^>v^<^v^vv<><^>vv^>v^vvv^<>>^><^<^<>^<<v^v<^v><>^v<v>>^>>^v^vv>><vv><v^^<<^v^<>^v<<>^><^>><v>>v<<<v^^vv<>^^v>>><><><<v^<<<v^<^^><v^>v^^vv<v^<>>vv^<^v<>^v>>v^v>v<^^vv><>^v<<>v^<>v^>>v>vvv<^><><^^>^vv^>>v^>^<^^<><>><<>^^^><^v^v><<<><<^v^vv>v>><^>>><v^>v<v><><v^v<>v^^>>v<<>v>v<v<v<^^<><>v^^<>>v<^v<v>v<><v<v>^<<>v>vv^^<>>^^^<>^^>^v>v>>>^v^v><v^^<><v>^^v^v<^<^^><<v<^<^<>^<>><<>^>>^>^^><v><>v<><>><<<>>>>vv>>>^>>^v<^>v^^^v<<vv>><<<^<<<>>>>>^>vv<^v^<>^<v^>^v><v>vvv<>>>^v^^^v<<<<>>^^<vv<^<^^>^<>v<^<<<>><>>v<^<>^<vvv<^<>><><<v>^^^>^^<<v<v^>^^v^>><<^vv><v>^v>>^<v>v>^^>^v>^vvv<>v^v^^<><vv>vv^>>><>v<^><v<v^<><<<>^v>^v<<<^>^>^>v^v<<><vvv<<v^^<><v>^>>><vv>><v>>v^<vv>>vv<<^v^v<<><^v<vv>>>vv<>>>>^vv>v^<>vv>v^v<v^><v<^^^^^>vv<><<vvv^<v><^<vv><^^^vv^<>^^^^<^><^<>v^<v^v<<^v<<^^<>>^<v^^>>>vv<vvv<>v<<>><^vvv^<<^^<<>>>^<>>>v^^><>><<>><v^v>>>>>><>>><v^<<vvv^>v<>>v^<>vv<><^^^^v^<<^<v^vv><<^^>v<^vvv^v>>v>^>>v>^^><<v^<>v<>vv<^v^vv><v><<vv^v>>v^>>v<^^^>^><<v<>^><>v>>>vvv<v<vv<^>>^v<v>^<^^^^^v><>v><>v^v^v<v^vv^v>vvvv<>vv<<<vv<v<<>^<^>^^v^<<>^<v><^><v<v<><<>v^<<^<><vv>v<<^v>>^v<><v>^>>^^><>v^<^<vvv^>^>^<<<<>vv>^v^v<^^^<vv>><>^^<<v<^<^^>>>v^v<<^^^<v<v<^<>^v<v><v^vv^^v^^v^^<vv<>^<><vv^<^v^<<^><<vvv>^^<^^^<^v>^>^vv><<<^v<v>vv>v<>v^v<v^>v^>>>v^v<>^v<<>^vv>v>v>v^<^>v^^<^>^^^^vv>^^><^>vv^>>^^v>><<<<^><>v<>^<v<vv^>^^><<^><v>v^>^^<^>>><>><v^v<v^<v<vv^v^<<^<vvv>>><vv<^^>>^>^><<v^<>>v>v^v^^><<>vv^v>v^<v><^<>^^<^>v>^<><<<v>^<^<^>^>^>^^v^<<^^v^^<^<>><^>v>>^^<>^^^<<<<v^>^v<^vv>^<<<v<><<v<>vv>>>v><>>><>>v<<<vv><>^v>v<^>><^><><v<>^v^>^v>^v<<><<^<>>v>^><>^>><>><^<v^><v^^<><v><^^>^v^^<>v^<v^<^v<v^^^^^v^<<^>^^^<^v><>^^<<<><<<<<^^>v^vvvv>v<>>vv<^>^v^>v<^vv^v<<><<v>v^v>^^><><^<v^>v><vv><>>><<>^vv<>v>>v<^v>>>v<v>v>v>^vv<<>^^vv<v<^v^<v<v>vv<>^<^<vv<v^<^v^^><<>^>><^v>vv^^v<<^^><<>v^^<><><v^^<v^v>^>^>^>v<^<v>^v^^>v<>vvv<^v<v^v><<v^><<^^><^<<v^v^>v<>^>v><><v>^<v<v>^<^^^>^v<<><<><>vv>v^<>v^><v^v<v><><<v>v<vv><<v>>v>^<<<>vv>>vvv>^^vv^v^^<^^<>v^^<>v>>^^>^>^>v>><^>><>>^<<>><^>v<<<<<<<^v^v<v^<v^^>^<><<v<^>v^>v^vv<<^^vv^>>>>^<>v<^v<>v<vv<^>>v^vv>vv><vv<<^>v>><vv>>>vv^<<<<vv^>v<<<<^^>^^v^><<^<v^>v^>^^<v<>vvv^>^<>vvv<v<^^>v^<<v>><>v<v<>^^<vvv>^>vv><><<<^^vv<v^<v<>v<>><<v><^vv^>^<^>^^^<<<v>vv^<^<<>^>^<vv>v><v<<^><^>^^<vv^v^^>>>>vv^><^^vv><>^<v^v>v<vv>v><<<v>v<v>^><v^^><v>v<^v^>>^^<v^>^^>vv>>vv^><^vv^vv<<^>vv>^v<v><vv><v<vvvvv>^^v^v><v>>>^vv<>v>^^^^<^>><>^v^^^>v<^^<<^^v<vv<>vvv<^>><><^>>^><^<>v<v<<><<v><v^v<>><^>v><<v^<v>v<^<vv^v^v^>vvv^^>v>^<vv^>v^v^<>v>^>>vv>><^^<v<<>^vv<><><<^v<v>v<<vv><>><^v<v>>v^>vvv^v^<<^><v<>^vv^>v^<v<^>>v<v><v><v>>^<<<v^<><<>v>^>^^<v<>>^<>^>^><<<^<<^<<^>^v>>><vvv>><<<<v>>>>>>>^<^v<^>v<>vv<><>v>>^>>^>vv^^><<^<v<v>>^^<<^>v<^>>vv>^<>v><^>v<vv>>>>>>^v<^<<<v^><vv<<>>vv<<><v<><<<v<^<v<>>v<^^^^v^^<^^^<^<vv><<^>><>v<<>v<v<>>>><>v^vv>^>^>>vv^v<v<<><^v>vv^><v<<>v^v<^>vv<<^^v><^>>^^vv<^<>>v^^>><v>^v>>>^>>v>v<>v<^vv><>^<<^>vv>>><><>v^><>v^>v>v><^v<><v<v>^v<<^vv^><^^>><^^^<<<^>v>^v>>><^>><^>>>^^^<^>vv<><<<v^>^<^^>>^^^v^v^v>v<v>>>><^>>>v>^vv<<^^^<^^vv>v<<><v<<^^>v>><<v^^><^>^<^>^v^>v><^<^vv>v>><>^<<vv<<v>v<vv<v>^>^>><^^<v>^v^v<><<>vvv<^<v>^><>^>vvv>>>^><<>><v^^<^<<^v>>^v<v<vv>vv^v^>v<<vvv<^^v^v>^<^>>^>v<^>^v<<><<<^>^<^^^>vv<^^^^vv<v<^^v<<<<v<^v^<><v<<^><<>vv>>><^<^<>>>^>^>>^<<<<<^^v>^>^<>vvv^^<^><^>^^v>^vv^><v^<^<<v^<vvv<<^v<><^><^>>>v>^v>^>^v<vv^v>><v><^><v^^>v^>^<><<><>v<v^>vvv^>^>>v<>^><^>^><vvv>^^v^v>v<>^v^><^>>v>v^><<<^>>^<>^<>>v><>>v^>^>^^<>>v^>^<vvvv<^vvvv^>>vv^<v^v>^vv<>v<>^<v<v>v>^^><^>vv^<^v^<<^<^<><vv<^v<^v><>>>^v^<<^><^>vv<v>v<^>vv^>v<<<>^<><v<^^^>v><^^<>^<^<v^vv^<<^>><<v^v<^vvv<<<>>vvvv^v^^^>v<>>><<>vvv<<^^^>v>v>>v<<v<v^v^>^^v>^><^<><<v^<v<v^^^><>v^^^<v>vv<>^>^^vv>^<<^v<^v><v>>>^>>><^<<>^v>>^>vv<<<v<>^<v><v^<^<>v>v^^v^>><<^v<<<<>v>v>v^^<^><>^^<<<v>vv<>>>^>>v<><v^>^<><vv>v>v^v<v^<^>>^>><<^^<^^v<vv<>><<<v<^<<^^^>vvv^<vvv<^>vv><>><<<^<v^v^^<<^vvv^^<^<><<>^<^<>>vvv<>^<>v^v<><>>v^v><<>>>vvv>v<>^>>^><^>vv<<>>v<<^><>v>>^^<v>^>^<<>><^<<vv<^<vv^vv><>>>><^<v>^>vv<v><>^<>vvvvv^vv<<v<>>>^<<><>^^vvv>>>vv<<^^><^v^^v<>^^>^><^>v^^^^v<^<<vv<vv<>vv^^>v^vv>v><>>vv>^<^<v^v^>>v^v^^v>^>vv^>v<vvvv<^v<^v>^v>^^v<<^>^^<<>^><^v>>>vv^>^^>vvvv>>v<^<v>^>>>v^<><^<^^<v>vv^^><v>v^<>^^^>>><^^v>v>^<<>^<v^>vvv^>^^^><v<^>>v<v>>^v><<><<>v<^<<>^><>^>vv>^<v>^^v<<^v^vvv^^>^vv^<^>^>^^v>v^>^<<><<^>v>>vv^vv><v>>^<<^<v^^<^<v^^vv^><^^<^^><v^^>v^^^<^<>^<>>^v<^vvv^^v^<><^>>>>>v><><<<>vv<^v>><<>vvv<><<vv<<<^>v^^>>^>^v>><><^^v<>><>>v^>^<vv><<<>><><<v>^^<>>v<><^<vv>vv<^v>^<<<<v<^<<^^>>^<><^>><<>^>v>^^^v>>^<^^v><v^v>^><<><>>^>>^<<v<>^v<>^>^<v>>vv>^vvv<<v<<^>^>^<<^^<>^^^^vvv<>^vv<vvvvv^^>^^<^>>><>v^<><^<<^>v^^v<>>^vv<>v^^<>>v^vvvvv<<v^<v^^>>><vvvvv>><^>vv>v^v^<v<^>^^><^>^^^^v<><^v<<>v^>v>>vv<<>^<v^^>vvv>^^<v^<>vv^><>><v^^v<>^>>^>v><>>^^v>^>^>>>^>v<^v>v>^<^^^^^>>v<v<>>v<<^>^<v<<>^^>><<^><>v<>^^^vv<>^^>><<^^>v>vv>vv>v^>^v>v^^<>>><<v><v<<>>v><>vvv^^v>^^>^vvvv^>^<>^vvvv><v><v<>>><>^<^vv<>^v<^v<>^vvv<<>><vvv^>>^><<vv^<v^>^<v<<^^>^^<^^v^>v<>v^v><>><v^^>>^vvv><^vv>v^<^<^v>>v^^>^vvv^<v^^v^^>v<^<>>^<>>>^^<><^^vv<>^vv^<>>>>^^<<^^<>vv^^><>^^<v<<v>^<v^^>^v<><><>vvv>^v^>>vv<<^v<<>><v>^><^>>>^<^<^^>vv^<<^<>>^^><><<v>^^<v>>v<<vvvv>^v^vv>><^^<<^>>v>v<^^^<^><^^vv>^vv<^<vv<>v><^<><v><^^^>>^<><^<v>>>>v^<v>>>>>v<><^^>v<^<^>><v<>^>vv>^^v^v^<<v<><<<^v^><<^<><<<<v<^>><<<>v>>vv><vv<><<^<^<><vv>^^^^<>v<<<<v>vv<>vv^^^>><>vv^><>>^vv<<><^^vv<>v^>>^<<>^<v^<^>v<

  (defun day3/make-coord (x y)
    (cons x y))

  (defun day3/coord-x (coord)
    (car coord))

  (defun day3/coord-y (coord)
    (cdr coord))

  (defun day3/add-coords (a b)
    (day3/make-coord
     (+ (day3/coord-x a)
        (day3/coord-x b))
     (+ (day3/coord-y a)
        (day3/coord-y b))))

  (defun day3/arrow-to-coord (arrow)
    (cond ((eq arrow ?>) (day3/make-coord 1 0))
          ((eq arrow ?<) (day3/make-coord -1 0))
          ((eq arrow ?^) (day3/make-coord 0 1))
          ((eq arrow ?v) (day3/make-coord 0 -1))
          (t (day3/make-coord 0 0))))

  (defun day3/make-map ()
    (make-hash-table :test #'equal))

  (defun day3/map-visit (map coord)
    (puthash coord
             (+ 1 (gethash coord map 0))
             map))

  (defun day3/deliver (directions)
    (let ((map (day3/make-map)))
      (day3/map-visit map (day3/make-coord 0 0))
      (cdr (seq-reduce
            (lambda (acc next)
              (let* ((loc (car acc))
                     (map (cdr acc))
                     (next-loc (day3/add-coords loc
                                                (day3/arrow-to-coord next))))
                (day3/map-visit map next-loc)
                (cons next-loc map)))
            directions
            (cons (day3/make-coord 0 0)
                  map)))))

  (defun day3/map-count-visited (map)
    (hash-table-count map))

  (ert-deftest day3/map-count-visited ()
    (should (eq 2 (day3/map-count-visited
                   (day3/deliver ">"))))
    (should (eq 4 (day3/map-count-visited
                   (day3/deliver "^>v<"))))
    (should (eq 2 (day3/map-count-visited
                   (day3/deliver "^v^v^v^v^v")))))

  (day3/map-count-visited
   (day3/deliver input))

Part 2

The next year, to speed up the process, Santa creates a robot version of himself, Robo-Santa, to deliver presents with him.

Santa and Robo-Santa start at the same location (delivering two presents to the same starting house), then take turns moving based on instructions from the elf, who is eggnoggedly reading from the same script as the previous year.

This year, how many houses receive at least one present?

For example:

^v delivers presents to 3 houses, because Santa goes north, and then Robo-Santa goes south.
^>v< now delivers presents to 3 houses, and Santa and Robo-Santa end up back where they started.
^v^v^v^v^v now delivers presents to 11 houses, with Santa going one direction and Robo-Santa going the other.

  (require 'dash)

  (defun day3/alternate (count sequence)
    (->> (-zip (seq-into sequence 'list)
               (number-sequence 1 (seq-length sequence)))
         (-group-by (lambda (x) (mod (cdr x) count)))
         (-map (lambda (x) (-map #'car (cdr x))))))

  (defun day3/map-visit-n (map coord times)
    (puthash coord
             (+ times (gethash coord map 0))
             map))

  (defun day3/map-visits (map coord)
    (gethash coord map 0))

  (defun day3/map-locations (map)
    (hash-table-keys map))

  (defun day3/map-merge (a &rest maps)
    (-map (lambda (map)
            (-map (lambda (coord)
                    (day3/map-visit-n a coord (day3/map-visits map coord)))
                  (day3/map-locations map)))
          maps)
    a)

  (defun day3/deliver-with-robosanta (directions)
    (let* ((alternated (day3/alternate 2 (string-to-list directions)))
           (santa-directions (car alternated))
           (robot-directions (cadr alternated)))
      (day3/map-merge
       (day3/deliver santa-directions)
       (day3/deliver robot-directions))))

  (ert-deftest day3/deliver-with-robosanta ()
    (should (eq 3 (day3/map-count-visited
                   (day3/deliver-with-robosanta "^v"))))
    (should (eq 3 (day3/map-count-visited
                   (day3/deliver-with-robosanta "^>v<"))))
    (should (eq 11 (day3/map-count-visited
                    (day3/deliver-with-robosanta "^v^v^v^v^v")))))

  (day3/map-count-visited
   (day3/deliver-with-robosanta input))

Day 4: The Ideal Stocking Stuffer

Santa needs help mining some AdventCoins (very similar to bitcoins) to use as gifts for all the economically forward-thinking little girls and boys.

To do this, he needs to find MD5 hashes which, in hexadecimal, start with at least five zeroes. The input to the MD5 hash is some secret key (your puzzle input, given below) followed by a number in decimal. To mine AdventCoins, you must find Santa the lowest positive number (no leading zeroes: 1, 2, 3, …) that produces such a hash.

For example:

If your secret key is abcdef, the answer is 609043, because the MD5 hash of abcdef609043 starts with five zeroes (000001dbbfa...), and it is the lowest such number to do so.
If your secret key is pqrstuv, the lowest number it combines with to make an MD5 hash starting with five zeroes is 1048970; that is, the MD5 hash of pqrstuv1048970 looks like 000006136ef....

  ckczppom

  (defun day4/mine-hash (key n)
    (md5 (format "%s%d" key n)))

  (defun day4/adventcoin-hash-p (hash)
    (string-equal
     "00000"
     (substring hash 0 5)))

  (defun day4/first-adventcoin (secret)
    (loop for x from 0
          while (not (day4/adventcoin-hash-p (day4/mine-hash secret x)))
          count x))

  (ert-deftest day4/first-adventcoin ()
    (should (eq 609043 (day4/first-adventcoin "abcdef")))
    (should (eq 1048970 (day4/first-adventcoin "pqrstuv"))))

  (day4/first-adventcoin (string-trim input))

Part 2

Now find one that starts with six zeroes.

  (defun day4/adventcoin-hash-6-p (n hash)
    (string-equal
     "000000"
     (substring hash 0 6)))

  (defun day4/first-adventcoin-n (n secret)
    (loop for x from 0
          while (not (day4/adventcoin-hash-6-p n (day4/mine-hash secret x)))
          count x))

  (day4/first-adventcoin-n 6 (string-trim input))

Day 5: Doesn't He Have Intern-Elves For This?

Santa needs help figuring out which strings in his text file are naughty or nice.

A nice string is one with all of the following properties:

It contains at least three vowels (aeiou only), like aei, xazegov, or aeiouaeiouaeiou.
It contains at least one letter that appears twice in a row, like xx, abcdde (dd), or aabbccdd (aa, bb, cc, or dd).
It does not contain the strings ab, cd, pq, or xy, even if they are part of one of the other requirements.

For example:

ugknbfddgicrmopn is nice because it has at least three vowels (u...i...o...), a double letter (...dd...), and none of the disallowed substrings.
aaa is nice because it has at least three vowels and a double letter, even though the letters used by different rules overlap.
jchzalrnumimnmhp is naughty because it has no double letter.
haegwjzuvuyypxyu is naughty because it contains the string xy.
=dvszwmarrgswjxmb- is naughty because it contains only one vowel.

How many strings are nice?

  sszojmmrrkwuftyv
  isaljhemltsdzlum
  fujcyucsrxgatisb
  qiqqlmcgnhzparyg
  oijbmduquhfactbc
  jqzuvtggpdqcekgk
  zwqadogmpjmmxijf
  uilzxjythsqhwndh
  gtssqejjknzkkpvw
  wrggegukhhatygfi
  vhtcgqzerxonhsye
  tedlwzdjfppbmtdx
  iuvrelxiapllaxbg
  feybgiimfthtplui
  qxmmcnirvkzfrjwd
  vfarmltinsriqxpu
  oanqfyqirkraesfq
  xilodxfuxphuiiii
  yukhnchvjkfwcbiq
  bdaibcbzeuxqplop
  ivegnnpbiyxqsion
  ybahkbzpditgwdgt
  dmebdomwabxgtctu
  ibtvimgfaeonknoh
  jsqraroxudetmfyw
  dqdbcwtpintfcvuz
  tiyphjunlxddenpj
  fgqwjgntxagidhah
  nwenhxmakxqkeehg
  zdoheaxqpcnlhnen
  tfetfqojqcdzlpbm
  qpnxkuldeiituggg
  xwttlbdwxohahwar
  hjkwzadmtrkegzye
  koksqrqcfwcaxeof
  wulwmrptktliyxeq
  gyufbedqhhyqgqzj
  txpunzodohikzlmj
  jloqfuejfkemcrvu
  amnflshcheuddqtc
  pdvcsduggcogbiia
  yrioavgfmeafjpcz
  uyhbtmbutozzqfvq
  mwhgfwsgyuwcdzik
  auqylgxhmullxpaa
  lgelzivplaeoivzh
  uyvcepielfcmswoa
  qhirixgwkkccuzlp
  zoonniyosmkeejfg
  iayfetpixkedyana
  ictqeyzyqswdskiy
  ejsgqteafvmorwxe
  lhaiqrlqqwfbrqdx
  ydjyboqwhfpqfydc
  dwhttezyanrnbybv
  edgzkqeqkyojowvr
  rmjfdwsqamjqehdq
  ozminkgnkwqctrxz
  bztjhxpjthchhfcd
  vrtioawyxkivrpiq
  dpbcsznkpkaaclyy
  vpoypksymdwttpvz
  hhdlruwclartkyap
  bqkrcbrksbzcggbo
  jerbbbnxlwfvlaiw
  dwkasufidwjrjfbf
  kkfxtjhbnmqbmfwf
  vmnfziwqxmioukmj
  rqxvcultipkecdtu
  fhmfdibhtjzkiqsd
  hdpjbuzzbyafqrpd
  emszboysjuvwwvts
  msyigmwcuybfiooq
  druyksfnbluvnwoh
  fvgstvynnfbvxhsx
  bmzalvducnqtuune
  lzwkzfzttsvpllei
  olmplpvjamynfyfd
  padcwfkhystsvyfb
  wjhbvxkwtbfqdilb
  hruaqjwphonnterf
  bufjobjtvxtzjpmj
  oiedrjvmlbtwyyuy
  sgiemafwfztwsyju
  nsoqqfudrtwszyqf
  vonbxquiiwxnazyl
  yvnmjxtptujwqudn
  rrnybqhvrcgwvrkq
  taktoxzgotzxntfu
  quffzywzpxyaepxa
  rfvjebfiddcfgmwv
  iaeozntougqwnzoh
  scdqyrhoqmljhoil
  bfmqticltmfhxwld
  brbuktbyqlyfpsdl
  oidnyhjkeqenjlhd
  kujsaiqojopvrygg
  vebzobmdbzvjnjtk
  uunoygzqjopwgmbg
  piljqxgicjzgifso
  ikgptwcjzywswqnw
  pujqsixoisvhdvwi
  trtuxbgigogfsbbk
  mplstsqclhhdyaqk
  gzcwflvmstogdpvo
  tfjywbkmimyyqcjd
  gijutvhruqcsiznq
  ibxkhjvzzxgavkha
  btnxeqvznkxjsgmq
  tjgofgauxaelmjoq
  sokshvyhlkxerjrv
  ltogbivktqmtezta
  uduwytzvqvfluyuf
  msuckpthtgzhdxan
  fqmcglidvhvpirzr
  gwztkqpcwnutvfga
  bsjfgsrntdhlpqbx
  xloczbqybxmiopwt
  orvevzyjliomkkgu
  mzjbhmfjjvaziget
  tlsdxuhwdmghdyjb
  atoecyjhwmznaewi
  pyxpyvvipbqibiox
  ajbfmpqqobfsmesj
  siknbzefjblnohgd
  eqfhgewbblwdfkmc
  opylbscrotckkrbk
  lbwxbofgjkzdxkle
  ceixfjstaptdomvm
  hnkrqxifjmmjktie
  aqykzeuzvvetoygd
  fouahjimfcisxima
  prkzhutbqsyrhjzx
  qqwliakathnsbzne
  sayhgqtlcqqidqhj
  ygduolbysehdudra
  zricvxhdzznuxuce
  ucvzakslykpgsixd
  udirhgcttmyspgsb
  yuwzppjzfsjhhdzi
  gtqergjiuwookwre
  xvxexbjyjkxovvwf
  mlpaqhnnkqxrmwmm
  ezuqbrjozwuqafhb
  mcarusdthcbsonoq
  weeguqeheeiigrue
  pngtfugozxofaqxv
  copphvbjcmfspenv
  jiyahihykjjkdaya
  gdqnmesvptuyrfwp
  vbdscfywqmfxbohh
  crtrfuxyjypzubrg
  seihvevtxywxhflp
  fvvpmgttnapklwou
  qmqaqsajmqwhetpk
  zetxvrgjmblxvakr
  kpvwblrizaabmnhz
  mwpvvzaaicntrkcp
  clqyjiegtdsswqfm
  ymrcnqgcpldgfwtm
  nzyqpdenetncgnwq
  cmkzevgacnmdkqro
  kzfdsnamjqbeirhi
  kpxrvgvvxapqlued
  rzskbnfobevzrtqu
  vjoahbfwtydugzap
  ykbbldkoijlvicbl
  mfdmroiztsgjlasb
  quoigfyxwtwprmdr
  ekxjqafwudgwfqjm
  obtvyjkiycxfcdpb
  lhoihfnbuqelthof
  eydwzitgxryktddt
  rxsihfybacnpoyny
  bsncccxlplqgygtw
  rvmlaudsifnzhcqh
  huxwsyjyebckcsnn
  gtuqzyihwhqvjtes
  zreeyomtngvztveq
  nwddzjingsarhkxb
  nuqxqtctpoldrlsh
  wkvnrwqgjooovhpf
  kwgueyiyffudtbyg
  tpkzapnjxefqnmew
  ludwccvkihagvxal
  lfdtzhfadvabghna
  njqmlsnrkcfhtvbb
  cajzbqleghhnlgap
  vmitdcozzvqvzatp
  eelzefwqwjiywbcz
  uyztcuptfqvymjpi
  aorhnrpkjqqtgnfo
  lfrxfdrduoeqmwwp
  vszpjvbctblplinh
  zexhadgpqfifcqrz
  ueirfnshekpemqua
  qfremlntihbwabtb
  nwznunammfexltjc
  zkyieokaaogjehwt
  vlrxgkpclzeslqkq
  xrqrwfsuacywczhs
  olghlnfjdiwgdbqc
  difnlxnedpqcsrdf
  dgpuhiisybjpidsj
  vlwmwrikmitmoxbt
  sazpcmcnviynoktm
  pratafauetiknhln
  ilgteekhzwlsfwcn
  ywvwhrwhkaubvkbl
  qlaxivzwxyhvrxcf
  hbtlwjdriizqvjfb
  nrmsononytuwslsa
  mpxqgdthpoipyhjc
  mcdiwmiqeidwcglk
  vfbaeavmjjemfrmo
  qzcbzmisnynzibrc
  shzmpgxhehhcejhb
  wirtjadsqzydtyxd
  qjlrnjfokkqvnpue
  dxawdvjntlbxtuqc
  wttfmnrievfestog
  eamjfvsjhvzzaobg
  pbvfcwzjgxahlrag
  omvmjkqqnobvnzkn
  lcwmeibxhhlxnkzv
  uiaeroqfbvlazegs
  twniyldyuonfyzqw
  wgjkmsbwgfotdabi
  hnomamxoxvrzvtew
  ycrcfavikkrxxfgw
  isieyodknagzhaxy
  mgzdqwikzullzyco
  mumezgtxjrrejtrs
  nwmwjcgrqiwgfqel
  wjgxmebfmyjnxyyp
  durpspyljdykvzxf
  zuslbrpooyetgafh
  kuzrhcjwbdouhyme
  wyxuvbciodscbvfm
  kbnpvuqwmxwfqtqe
  zddzercqogdpxmft
  sigrdchxtgavzzjh
  lznjolnorbuddgcs
  ycnqabxlcajagwbt
  bnaudeaexahdgxsj
  rlnykxvoctfwanms
  jngyetkoplrstfzt
  tdpxknwacksotdub
  yutqgssfoptvizgr
  lzmqnxeqjfnsxmsa
  iqpgfsfmukovsdgu
  qywreehbidowtjyz
  iozamtgusdctvnkw
  ielmujhtmynlwcfd
  hzxnhtbnmmejlkyf
  ftbslbzmiqkzebtd
  bcwdqgiiizmohack
  dqhfkzeddjzbdlxu
  mxopokqffisxosci
  vciatxhtuechbylk
  khtkhcvelidjdena
  blatarwzfqcapkdt
  elamngegnczctcck
  xeicefdbwrxhuxuf
  sawvdhjoeahlgcdr
  kmdcimzsfkdfpnir
  axjayzqlosrduajb
  mfhzreuzzumvoggr
  iqlbkbhrkptquldb
  xcvztvlshiefuhgb
  pkvwyqmyoazocrio
  ajsxkdnerbmhyxaj
  tudibgsbnpnizvsi
  cxuiydkgdccrqvkh
  cyztpjesdzmbcpot
  nnazphxpanegwitx
  uphymczbmjalmsct
  yyxiwnlrogyzwqmg
  gmqwnahjvvdyhnfa
  utolskxpuoheugyl
  mseszdhyzoyavepd
  ycqknvbuvcjfgmlc
  sknrxhxbfpvpeorn
  zqxqjetooqcodwml
  sesylkpvbndrdhsy
  fryuxvjnsvnjrxlw
  mfxusewqurscujnu
  mbitdjjtgzchvkfv
  ozwlyxtaalxofovd
  wdqcduaykxbunpie
  rlnhykxiraileysk
  wgoqfrygttlamobg
  kflxzgxvcblkpsbz
  tmkisflhativzhde
  owsdrfgkaamogjzd
  gaupjkvkzavhfnes
  wknkurddcknbdleg
  lltviwincmbtduap
  qwzvspgbcksyzzmb
  ydzzkumecryfjgnk
  jzvmwgjutxoysaam
  icrwpyhxllbardkr
  jdopyntshmvltrve
  afgkigxcuvmdbqou
  mfzzudntmvuyhjzt
  duxhgtwafcgrpihc
  tsnhrkvponudumeb
  sqtvnbeiigdzbjgv
  eczmkqwvnsrracuo
  mhehsgqwiczaiaxv
  kaudmfvifovrimpd
  lupikgivechdbwfr
  mwaaysrndiutuiqx
  aacuiiwgaannunmm
  tjqjbftaqitukwzp
  lrcqyskykbjpaekn
  lirrvofbcqpjzxmr
  jurorvzpplyelfml
  qonbllojmloykjqe
  sllkzqujfnbauuqp
  auexjwsvphvikali
  usuelbssqmbrkxyc
  wyuokkfjexikptvv
  wmfedauwjgbrgytl
  sfwvtlzzebxzmuvw
  rdhqxuechjsjcvaf
  kpavhqkukugocsxu
  ovnjtumxowbxduts
  zgerpjufauptxgat
  pevvnzjfwhjxdoxq
  pmmfwxajgfziszcs
  difmeqvaghuitjhs
  icpwjbzcmlcterwm
  ngqpvhajttxuegyh
  mosjlqswdngwqsmi
  frlvgpxrjolgodlu
  eazwgrpcxjgoszeg
  bbtsthgkjrpkiiyk
  tjonoglufuvsvabe
  xhkbcrofytmbzrtk
  kqftfzdmpbxjynps
  kmeqpocbnikdtfyv
  qjjymgqxhnjwxxhp
  dmgicrhgbngdtmjt
  zdxrhdhbdutlawnc
  afvoekuhdboxghvx
  hiipezngkqcnihty
  bbmqgheidenweeov
  suprgwxgxwfsgjnx
  adeagikyamgqphrj
  zzifqinoeqaorjxg
  adhgppljizpaxzld
  lvxyieypvvuqjiyc
  nljoakatwwwoovzn
  fcrkfxclcacshhmx
  ownnxqtdhqbgthch
  lmfylrcdmdkgpwnj
  hlwjfbvlswbzpbjr
  mkofhdtljdetcyvp
  synyxhifbetzarpo
  agnggugngadrcxoc
  uhttadmdmhidpyjw
  ohfwjfhunalbubpr
  pzkkkkwrlvxiuysn
  kmidbxmyzkjrwjhu
  egtitdydwjxmajnw
  civoeoiuwtwgbqqs
  dfptsguzfinqoslk
  tdfvkreormspprer
  zvnvbrmthatzztwi
  ffkyddccrrfikjde
  hrrmraevdnztiwff
  qaeygykcpbtjwjbr
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  qzziznlswjaussel
  dfcxkvdpqccdqqxj
  tuotforulrrytgyn
  gmtgfofgucjywkev
  wkyoxudvdkbgpwhd
  qbvktvfvipftztnn
  otckgmojziezmojb
  inxhvzbtgkjxflay
  qvxapbiatuudseno
  krpvqosbesnjntut
  oqeukkgjsfuqkjbb
  prcjnyymnqwqksiz
  vuortvjxgckresko
  orqlyobvkuwgathr
  qnpyxlnazyfuijox
  zwlblfkoklqmqzkw
  hmwurwtpwnrcsanl
  jzvxohuakopuzgpf
  sfcpnxrviphhvxmx
  qtwdeadudtqhbely
  dbmkmloasqphnlgj
  olylnjtkxgrubmtk
  nxsdbqjuvwrrdbpq
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  otqocljrmwfqbxzu
  linfbsnfvixlwykn
  vxsluutrwskslnye
  zbshygtwugixjvsi
  zdcqwxvwytmzhvoo
  wrseozkkcyctrmei
  fblgtvogvkpqzxiy
  opueqnuyngegbtnf
  qxbovietpacqqxok
  zacrdrrkohfygddn
  gbnnvjqmkdupwzpq
  qgrgmsxeotozvcak
  hnppukzvzfmlokid
  dzbheurndscrrtcl
  wbgdkadtszebbrcw
  fdmzppzphhpzyuiz
  bukomunhrjrypohj
  ohodhelegxootqbj
  rsplgzarlrknqjyh
  punjjwpsxnhpzgvu
  djdfahypfjvpvibm
  mlgrqsmhaozatsvy
  xwktrgyuhqiquxgn
  wvfaoolwtkbrisvf
  plttjdmguxjwmeqr
  zlvvbwvlhauyjykw
  cigwkbyjhmepikej
  masmylenrusgtyxs
  hviqzufwyetyznze
  nzqfuhrooswxxhus
  pdbdetaqcrqzzwxf
  oehmvziiqwkzhzib
  icgpyrukiokmytoy
  ooixfvwtiafnwkce
  rvnmgqggpjopkihs
  wywualssrmaqigqk
  pdbvflnwfswsrirl
  jeaezptokkccpbuj
  mbdwjntysntsaaby
  ldlgcawkzcwuxzpz
  lwktbgrzswbsweht
  ecspepmzarzmgpjm
  qmfyvulkmkxjncai
  izftypvwngiukrns
  zgmnyjfeqffbooww
  nyrkhggnprhedows
  yykzzrjmlevgffah
  mavaemfxhlfejfki
  cmegmfjbkvpncqwf
  zxidlodrezztcrij
  fseasudpgvgnysjv
  fupcimjupywzpqzp
  iqhgokavirrcvyys
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  slqyrcurcyuoxquo
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  epzvfkispwqynadu
  dwlpfhtrafrxlyie
  qhgzujhgdruowoug
  girstvkahaemmxvh
  baitcrqmxhazyhbl
  xyanqcchbhkajdmc
  gfvjmmcgfhvgnfdq
  tdfdbslwncbnkzyz
  jojuselkpmnnbcbb
  hatdslkgxtqpmavj
  dvelfeddvgjcyxkj
  gnsofhkfepgwltse
  mdngnobasfpewlno
  qssnbcyjgmkyuoga
  glvcmmjytmprqwvn
  gwrixumjbcdffsdl
  lozravlzvfqtsuiq
  sicaflbqdxbmdlch
  inwfjkyyqbwpmqlq
  cuvszfotxywuzhzi
  igfxyoaacoarlvay
  ucjfhgdmnjvgvuni
  rvvkzjsytqgiposh
  jduinhjjntrmqroz
  yparkxbgsfnueyll
  lyeqqeisxzfsqzuj
  woncskbibjnumydm
  lltucklragtjmxtl
  ubiyvmyhlesfxotj
  uecjseeicldqrqww
  xxlxkbcthufnjbnm
  lhqijovvhlffpxga
  fzdgqpzijitlogjz
  efzzjqvwphomxdpd
  jvgzvuyzobeazssc
  hejfycgxywfjgbfw
  yhjjmvkqfbnbliks
  sffvfyywtlntsdsz
  dwmxqudvxqdenrur
  asnukgppdemxrzaz
  nwqfnumblwvdpphx
  kqsmkkspqvxzuket
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  (defun day5/vowels (string)
    (seq-filter
     (apply-partially 'seq-contains "aeiou")
     string))

  (defun day5/has-doubles? (string)
    (string-match-p "\\([a-z]\\)\\1" string))

  (defun day5/naughty? (string)
       (-any
        (lambda (naughty-pattern)
          (s-contains? naughty-pattern string))
        '("ab" "cd" "pq" "xy")))

  (defun day5/nice? (string)
    (and (<= 3 (length (day5/vowels string)))
         (day5/has-doubles? string)
         (not (day5/naughty? string))))

  (ert-deftest day5/nice? ()
    (should (day5/nice? "ugknbfddgicrmopn"))
    (should (day5/nice? "aaa"))
    (should-not (day5/nice? "jchzalrnumimnmhp"))
    (should-not (day5/nice? "haegwjzuvuyypxyu"))
    (should-not (day5/nice? "dvszwmarrgswjxmb")))

  (length
   (-filter #'day5/nice?
            (split-string input)))

61 KiB Raw Blame History

Advent of Code

Day 1: Not Quite Lisp

Part 2

Day 2: I Was Told There Would Be No Math

Part 2

Day 3: Perfectly Spherical Houses in a Vacuum

Part 2

Day 4: The Ideal Stocking Stuffer

Part 2

Day 5: Doesn't He Have Intern-Elves For This?

61 KiB

Raw Blame History