2024(6): pull in puzzle

2024/06/README.md

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+# Day 6: Guard Gallivant
+
+[https://adventofcode.com/2024/day/6](https://adventofcode.com/2024/day/6)
+
+## Description
+
+### Part One
+
+The Historians use their fancy [device](https://adventofcode.com/2024/day/4) again, this time to whisk you all away to the North Pole prototype suit manufacturing lab... in the year [1518](https://adventofcode.com/2018/day/5)! It turns out that having direct access to history is very convenient for a group of historians.
+
+You still have to be careful of time paradoxes, and so it will be important to avoid anyone from 1518 while The Historians search for the Chief. Unfortunately, a single _guard_ is patrolling this part of the lab.
+
+Maybe you can work out where the guard will go ahead of time so that The Historians can search safely?
+
+You start by making a map (your puzzle input) of the situation. For example:
+
+    ....#.....
+    .........#
+    ..........
+    ..#.......
+    .......#..
+    ..........
+    .#..^.....
+    ........#.
+    #.........
+    ......#...
+    
+
+The map shows the current position of the guard with `^` (to indicate the guard is currently facing _up_ from the perspective of the map). Any _obstructions_ - crates, desks, alchemical reactors, etc. - are shown as `#`.
+
+Lab guards in 1518 follow a very strict patrol protocol which involves repeatedly following these steps:
+
+*   If there is something directly in front of you, turn right 90 degrees.
+*   Otherwise, take a step forward.
+
+Following the above protocol, the guard moves up several times until she reaches an obstacle (in this case, a pile of failed suit prototypes):
+
+    ....#.....
+    ....^....#
+    ..........
+    ..#.......
+    .......#..
+    ..........
+    .#........
+    ........#.
+    #.........
+    ......#...
+    
+
+Because there is now an obstacle in front of the guard, she turns right before continuing straight in her new facing direction:
+
+    ....#.....
+    ........>#
+    ..........
+    ..#.......
+    .......#..
+    ..........
+    .#........
+    ........#.
+    #.........
+    ......#...
+    
+
+Reaching another obstacle (a spool of several _very_ long polymers), she turns right again and continues downward:
+
+    ....#.....
+    .........#
+    ..........
+    ..#.......
+    .......#..
+    ..........
+    .#......v.
+    ........#.
+    #.........
+    ......#...
+    
+
+This process continues for a while, but the guard eventually leaves the mapped area (after walking past a tank of universal solvent):
+
+    ....#.....
+    .........#
+    ..........
+    ..#.......
+    .......#..
+    ..........
+    .#........
+    ........#.
+    #.........
+    ......#v..
+    
+
+By predicting the guard's route, you can determine which specific positions in the lab will be in the patrol path. _Including the guard's starting position_, the positions visited by the guard before leaving the area are marked with an `X`:
+
+    ....#.....
+    ....XXXXX#
+    ....X...X.
+    ..#.X...X.
+    ..XXXXX#X.
+    ..X.X.X.X.
+    .#XXXXXXX.
+    .XXXXXXX#.
+    #XXXXXXX..
+    ......#X..
+    
+
+In this example, the guard will visit _`41`_ distinct positions on your map.
+
+Predict the path of the guard. _How many distinct positions will the guard visit before leaving the mapped area?_