Day 12: Rain Risk

Input: list of actions Output: position, Manhattan distance

Classes:

Orientation(value)	Represent the facing orientation of the ship.
ShipPosition(horizontal, vertical, orientation)	Represent the current ferry position.

Functions:

parse_input(puzzle_input)	Split the puzzle input along the newlines.
update_position(current_position, move)	Execute a single move on current_position and return a new position.
solve(puzzle_input)	Execute the instructions and return the final ship's position.

class Orientation(value)

Represent the facing orientation of the ship.

Attributes:

EAST
SOUTH
WEST
NORTH

EAST = 0

SOUTH = 1

WEST = 2

NORTH = 3

class ShipPosition(horizontal: int, vertical: int, orientation: Orientation)

Represent the current ferry position.

Attributes:

horizontal	Position of the ship in horizontal direction
vertical	Position of the ship in vertical direction
orientation	Orientation of the ship

Methods:

__repr__()	Return repr(self).
__eq__(other)	Return self==value.
__init__(horizontal, vertical, orientation)

horizontal: int

Position of the ship in horizontal direction

vertical: int

Position of the ship in vertical direction

orientation: Orientation

Orientation of the ship

__repr__() → str

Return repr(self).

__eq__(other)

Return self==value.

__init__(horizontal: int, vertical: int, orientation: Orientation) → None

parse_input(puzzle_input: str) → Lines

Split the puzzle input along the newlines.

Requires

• re.fullmatch(r"[NSEWLRF][0-9]+(n[NSEWLRF][0-9]+)*", puzzle_input)

Ensures

• "n".join(result) == puzzle_input

update_position(current_position: ShipPosition, move: str) → ShipPosition

Execute a single move on current_position and return a new position.

Requires

• not (move[0] == "L" or move[0] == "R")
  or int(move[1:]) in [0, 90, 180, 270, 360]
  

• re.match(r"^[NSEWLRF][0-9]+$", move)

solve(puzzle_input: str) → ShipPosition

Execute the instructions and return the final ship’s position.

Requires

• re.match(
      r"^(([NSEWF][0-9]+)|([LR](0|90|180|270|360)))"
      r"(\n(([NSEWF][0-9]+)|([LR](0|90|180|270|360))))*\Z",
      puzzle_input,
  )