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Advent of Code Day 9 for RC
Raw
main.py
# Solution to Advent of Code 2022 Day 9
# https://adventofcode.com/2022/day/9
# Tested only in Python 3.11.0
from typing import Tuple
class Knot:
def __init__(self) -> None:
self._position = (0, 0)
def move(self, prev_knot_pos: Tuple[int, int]) -> None:
xgap = prev_knot_pos[0] - self._position[0]
ygap = prev_knot_pos[1] - self._position[1]
# Means it's touching the previous knot. No movement.
if abs(xgap) <= 1 and abs(ygap) <= 1:
movement = (0, 0)
# Need to move knot horizontally
elif ygap == 0:
assert xgap in (-2, 2)
movement = ((xgap // abs(xgap)), 0)
# Need to move knot vertically
elif xgap == 0:
assert ygap in (-2, 2)
movement = (0, (ygap // abs(ygap)))
# Need to move knot diagonally
else:
movement = ((xgap // abs(xgap)), (ygap // abs(ygap)))
must_move = any(movement)
if must_move:
new_x = self._position[0] + movement[0]
new_y = self._position[1] + movement[1]
self._position = (new_x, new_y)
def get_pos(self) -> Tuple[int, int]:
return self._position
class Rope:
directions = {
"R": (1, 0),
"U": (0, 1),
"L": (-1, 0),
"D": (0, -1),
}
def __init__(self, num_knots) -> None:
self._head_pos = (0, 0)
self._knots = [Knot() for _ in range(num_knots - 1)]
def move_head(self, direction: str) -> None:
movement = self.directions[direction]
new_x = self._head_pos[0] + movement[0]
new_y = self._head_pos[1] + movement[1]
self._head_pos = (new_x, new_y)
self.move_knots()
def move_knots(self) -> None:
prev_knot_pos = self.get_head_pos()
for knot in self._knots:
knot.move(prev_knot_pos=prev_knot_pos)
new_pos = knot.get_pos()
has_moved = new_pos != prev_knot_pos
if has_moved is False:
break
prev_knot_pos = new_pos
def get_head_pos(self) -> Tuple[int, int]:
return self._head_pos
def get_tail_pos(self) -> Tuple[int, int]:
return self._knots[-1]._position
def part1():
rope = Rope(num_knots=2)
tail_positions = set()
with open("puzzle_input.txt") as f:
for row in f:
row = row.strip()
direction, howmany = row.split()
for _ in range(int(howmany)):
rope.move_head(direction)
tail_positions.add(rope.get_tail_pos())
return len(tail_positions)
def part2():
rope = Rope(num_knots=10)
tail_positions = set()
with open("puzzle_input.txt") as f:
for row in f:
row = row.strip()
direction, howmany = row.split()
for _ in range(int(howmany)):
rope.move_head(direction)
tail_positions.add(rope.get_tail_pos())
return len(tail_positions)
if __name__ == "__main__":
print(part1())
print(part2())
Raw
puzzle_description_reduced.txt
REDUCED PUZZLE DESCRIPTION
ORIGINAL DESCRIPTION HERE: https://adventofcode.com/2022/day/9
--- Day 9: Rope Bridge ---
This rope bridge creaks as you walk along it. You aren't sure how old it is,
or whether it can even support your weight.
It seems to support the Elves just fine, though. The bridge spans a gorge which
was carved out by the massive river far below you.
You step carefully; as you do, the ropes stretch and twist. You decide to
distract yourself by modeling rope physics; maybe you can even figure out
where not to step.
Consider a rope with a knot at each end; these knots mark the head and the
tail of the rope. If the head moves far enough away from the tail, the tail is
pulled toward the head.
Due to nebulous reasoning involving Planck lengths, you should be able to
model the positions of the knots on a two-dimensional grid. Then, by following
a hypothetical series of motions (your puzzle input) for the head, you can
determine how the tail will move.
Due to the aforementioned Planck lengths, the rope must be quite short; in
fact, the head (H) and tail (T) must always be touching (diagonally adjacent
and even overlapping both count as touching):
....
.TH.
....
....
.H..
..T.
....
...
.H. (H covers T)
...
If the head is ever two steps directly up, down, left, or right from the tail,
the tail must also move one step in that direction so it remains close enough:
..... ..... .....
.TH.. -> .T.H. -> ..TH.
..... ..... .....
... ... ...
.T. .T. ...
.H. -> ... -> .T.
... .H. .H.
... ... ...
Otherwise, if the head and tail aren't touching and aren't in the same row or
column, the tail always moves one step diagonally to keep up:
..... ..... .....
..... ..H.. ..H..
..H.. -> ..... -> ..T..
.T... .T... .....
..... ..... .....
..... ..... .....
..... ..... .....
..H.. -> ...H. -> ..TH.
.T... .T... .....
..... ..... .....
You just need to work out where the tail goes as the head follows a series of
motions. Assume the head and the tail both start at the same position,
overlapping.
After simulating the rope, you can count up all of the positions the tail
visited at least once.
Simulate your complete hypothetical series of motions. How many positions does
the tail of the rope visit at least once?
The puzzle answer was 6098.
--- Part Two ---
A rope snaps! Suddenly, the river is getting a lot closer than you remember.
The bridge is still there, but some of the ropes that broke are now whipping
toward you as you fall through the air!
The ropes are moving too quickly to grab; you only have a few seconds to
choose how to arch your body to avoid being hit. Fortunately, your simulation
can be extended to support longer ropes.
Rather than two knots, you now must simulate a rope consisting of ten knots.
One knot is still the head of the rope and moves according to the series of
motions. Each knot further down the rope follows the knot in front of it using
the same rules as before.
Now, you need to keep track of the positions the new tail, visits.
Simulate your complete series of motions on a larger rope with ten knots. How
many positions does the tail of the rope visit at least once?
The puzzle answer was 2597.
Raw
puzzle_input.txt
D 2
L 2
U 1
L 1
U 2
R 1
L 1
D 2
U 2
R 2
U 1
L 2
R 1
D 1
L 2
R 1
U 2
L 1
U 1
D 1
R 1
U 2
D 2
L 1
D 1
U 1
L 1
U 1
D 2
U 1
L 2
D 1
L 1
D 2
U 1
D 2
R 1
L 2
R 1
U 1
R 2
U 2
D 2
R 1
D 1
R 1
U 2
D 1
U 2
D 2
L 1
D 2
R 2
U 1
L 1
R 1
U 2
D 2
R 1
D 2
U 1
L 2
R 1
L 2
D 2
U 2
D 2
L 2
U 1
L 1
D 2
L 1
R 2
U 2
D 1
R 1
U 2
D 2
U 1
R 2
L 1
R 1
L 1
U 2
D 2
L 2
D 1
L 2
U 2
R 2
L 1
D 1
L 2
U 1
L 2
D 2
L 2
D 2
R 2
L 2
R 1
D 1
L 2
U 2
L 2
R 1
D 1
R 1
D 2
R 1
U 2
R 3
U 1
D 2
U 3
R 2
U 3
D 3
U 1
L 3
R 1
U 1
D 2
U 1
D 2
R 1
L 3
R 1
L 3
D 1
L 2
D 3
U 2
R 3
D 2
L 2
D 1
U 2
R 2
L 3
R 3
L 1
R 1
U 3
D 3
L 2
U 2
L 2
R 1
U 2
L 2
D 3
R 2
U 2
L 3
D 1
R 1
U 2
R 3
D 2
U 3
D 1
R 2
L 2
D 1
U 3
L 1
D 2
L 1
R 2
L 1
R 1
D 3
L 3
R 2
L 2
R 3
D 3
U 1
L 3
D 1
R 2
L 2
R 1
D 3
R 1
L 2
R 3
U 2
R 3
L 3
D 3
L 3
D 1
U 1
R 1
U 3
D 1
U 2
D 3
R 3
U 1
L 3
D 3
U 1
R 2
D 1
R 3
D 2
R 1
L 2
D 3
L 2
R 2
D 3
U 3
L 1
U 3
L 2
R 2
L 1
U 3
D 1
R 3
U 4
D 1
L 2
R 2
U 2
R 2
D 2
U 1
R 2
D 1
R 4
L 4
D 1
U 2
L 2
D 1
R 2
L 3
U 4
L 1
R 2
D 2
L 1
R 1
D 2
U 1
L 2
R 1
D 2
L 3
R 4
D 3
U 1
R 4
L 1
D 3
R 1
D 1
L 3
R 1
U 4
L 1
R 3
L 3
R 1
U 3
R 3
U 3
L 2
R 4
D 3
L 1
U 1
D 3
U 3
D 3
U 1
R 2
U 2
D 2
U 1
D 3
L 2
D 1
U 3
D 2
U 3
L 2
U 2
R 3
U 4
D 2
R 3
L 2
D 2
R 4
U 2
R 3
L 2
U 3
R 1
U 1
L 2
D 2
U 3
L 2
R 4
U 1
R 3
U 1
R 4
L 2
R 4
D 3
U 3
R 3
L 3
U 3
D 4
R 3
U 3
L 4
D 4
U 4
L 4
R 1
U 3
L 3
U 1
R 1
D 5
R 2
L 3
U 2
D 2
L 2
R 3
D 3
L 2
R 2
L 5
R 1
L 5
D 2
R 3
U 5
L 4
R 3
L 3
U 1
R 1
D 4
U 5
L 4
U 2
L 4
D 1
L 5
U 5
R 3
L 1
U 2
L 2
D 2
L 3
D 5
U 3
R 3
U 2
D 2
U 1
R 4
U 4
L 3
R 2
L 4
U 4
D 2
L 2
D 3
U 5
D 4
L 5
D 3
R 3
U 5
R 2
L 1
U 1
L 5
D 1
R 5
L 3
U 2
L 1
R 5
U 2
R 4
U 2
R 4
L 2
U 5
R 5
U 2
R 3
D 2
L 3
R 5
D 5
L 5
D 2
L 5
R 4
U 1
R 3
D 1
U 5
R 1
U 3
L 1
R 4
D 5
L 4
D 1
U 3
R 4
L 3
R 5
L 5
D 3
L 1
D 5
U 3
D 3
U 1
R 4
L 5
R 1
U 5
D 2
L 2
D 1
U 6
R 6
D 6
U 5
R 6
D 4
R 3
L 3
U 2
L 5
U 6
R 4
U 3
L 4
R 3
L 1
D 3
U 4
D 4
R 4
U 6
D 2
R 1
U 3
D 1
L 1
D 4
L 5
D 4
L 4
D 5
L 5
U 1
R 1
U 6
R 2
U 2
R 3
U 2
L 4
U 5
D 1
L 6
U 2
L 2
U 3
L 1
R 5
U 1
R 2
L 1
R 1
D 5
L 5
D 5
L 3
R 4
L 5
U 3
D 1
U 3
L 5
R 2
D 4
R 6
L 4
D 5
U 5
L 6
U 3
R 1
L 5
D 2
R 4
U 4
D 2
L 5
U 4
D 1
U 3
D 3
R 3
U 1
D 3
U 4
D 3
R 6
D 4
L 6
D 5
U 1
R 2
D 5
R 3
L 2
D 2
U 2
D 6
L 6
U 2
L 5
R 2
U 5
L 6
R 4
D 3
R 3
U 3
L 3
U 5
D 2
L 3
U 7
L 6
U 2
R 6
D 5
U 5
D 5
R 1
L 1
R 6
L 6
R 3
U 1
D 1
U 2
R 7
U 4
R 6
D 4
L 6
U 7
R 1
L 1
D 2
L 6
D 3
L 4
D 3
U 6
D 3
U 3
R 1
U 6
D 5
L 5
D 5
U 2
D 7
L 3
R 4
D 2
R 1
D 4
U 1
D 6
U 1
R 2
U 6
R 4
L 2
U 1
R 4
D 2
L 1
U 3
L 3
D 5
L 6
D 3
R 3
D 1
L 1
D 6
L 3
U 4
D 7
U 2
L 3
U 1
L 6
U 4
D 6
L 3
R 7
U 2
R 5
D 1
L 6
D 6
U 3
D 2
L 6
U 3
L 3
R 3
U 3
L 4
D 3
U 1
L 6
U 2
D 2
U 5
L 4
D 6
L 3
R 7
D 2
U 1
R 1
D 3
U 2
L 7
D 4
U 6
D 6
U 2
D 5
L 4
D 4
L 7
R 1
D 4
U 8
L 1
D 1
U 4
R 3
L 4
R 8
L 1
U 2
L 6
U 7
D 5
R 4
L 5
U 1
D 6
L 6
D 7
R 5
U 4
D 7
U 7
R 5
L 2
D 5
L 5
U 3
R 7
U 6
R 6
D 5
R 4
L 7
U 6
R 6
U 1
R 4
U 7
R 8
D 1
L 3
R 6
L 2
U 7
R 7
U 3
R 7
D 1
U 8
R 2
L 4
U 1
D 6
R 5
U 8
L 8
U 4
D 8
L 8
U 3
R 7
L 3
U 2
R 6
L 5
R 2
L 1
R 8
D 7
R 5
D 3
U 3
R 2
U 2
L 4
D 2
U 1
R 2
D 3
U 7
L 4
D 5
L 6
D 3
R 1
D 7
U 8
R 3
D 5
R 5
D 7
U 3
R 1
L 2
U 8
R 6
D 1
U 7
D 3
U 2
R 3
D 7
R 2
D 4
R 5
U 1
D 8
U 1
D 1
R 4
D 1
L 1
U 3
L 3
U 7
R 1
L 7
U 1
R 5
U 9
R 1
U 5
R 6
U 7
R 1
D 9
L 9
R 6
U 3
L 6
R 8
L 1
U 5
L 9
R 2
U 4
L 9
D 8
R 8
U 6
D 8
U 8
L 5
U 7
R 6
U 5
R 2
L 7
U 9
D 2
U 9
R 7
L 9
R 5
L 1
U 4
D 3
L 3
D 9
L 5
R 9
U 8
D 9
U 6
R 4
D 3
U 9
L 9
U 8
L 6
R 9
L 8
R 1
L 4
D 8
L 1
R 5
L 1
R 7
D 2
L 2
D 4
R 7
U 9
R 3
L 2
R 1
D 9
R 1
U 6
D 7
U 4
D 8
L 6
D 8
L 4
U 5
R 6
U 9
R 7
U 1
R 5
D 1
R 9
D 1
R 7
D 2
U 2
R 5
U 9
R 4
U 4
R 2
D 9
R 7
D 3
U 1
L 2
R 3
U 7
L 5
R 2
U 10
D 4
U 7
L 6
R 5
L 10
U 2
D 7
L 9
D 8
R 5
L 9
D 2
R 10
U 8
D 10
L 2
D 6
R 6
L 3
R 10
D 7
U 2
D 7
R 1
U 9
D 1
R 10
L 6
U 1
L 9
U 7
R 1
U 1
D 7
U 6
L 2
R 8
L 5
D 3
R 7
L 2
D 10
R 1
D 9
L 10
R 3
L 8
D 1
R 5
U 9
L 10
R 9
L 5
D 7
R 7
L 6
D 3
R 10
L 3
D 6
L 9
D 10
R 2
L 10
U 9
R 3
U 9
R 9
L 3
U 6
R 6
D 3
R 10
L 8
D 3
L 8
U 8
D 4
R 1
L 2
D 1
U 9
D 8
R 8
U 10
D 2
U 7
R 3
L 2
D 2
R 1
U 5
L 7
R 6
D 10
U 8
D 8
L 9
D 1
L 6
U 6
L 10
U 10
D 8
U 2
R 2
L 6
R 6
U 11
R 3
D 1
U 8
R 4
L 6
U 3
L 5
D 9
U 8
L 11
D 4
R 5
D 8
U 9
R 7
L 10
U 6
L 9
U 8
D 5
R 7
D 3
U 7
R 7
D 2
U 3
D 1
U 3
D 6
U 11
R 8
L 3
D 5
L 6
D 2
R 4
U 6
R 3
L 11
D 4
R 3
L 9
R 3
L 1
D 11
R 6
D 6
U 4
L 3
R 10
L 6
D 8
U 2
D 7
L 10
R 8
D 5
L 10
D 11
L 6
D 10
L 9
D 2
R 10
D 9
U 9
D 2
R 10
D 9
U 10
L 3
U 1
D 6
L 5
U 5
R 10
L 3
D 6
R 9
L 1
D 5
U 10
R 5
L 9
U 3
R 5
U 3
D 6
R 11
D 9
L 6
R 5
D 3
R 7
D 6
R 1
U 3
L 4
U 8
R 8
L 3
U 4
R 3
U 5
L 10
D 6
U 2
R 1
D 11
R 7
L 7
D 1
L 11
D 2
R 10
D 5
L 6
D 9
L 9
D 2
U 6
L 5
R 3
U 6
D 3
U 3
D 4
R 10
L 8
D 5
R 8
D 10
L 7
D 4
L 10
R 10
U 11
L 4
U 1
D 12
U 8
L 5
R 5
L 9
U 1
L 4
R 4
L 6
D 11
L 9
U 10
D 4
L 6
U 7
R 10
L 3
U 4
D 12
U 9
D 4
L 5
D 11
R 6
D 1
L 4
U 5
D 1
U 8
D 8
R 6
L 4
D 4
U 1
L 1
R 11
L 2
R 4
L 9
U 3
D 6
U 2
R 6
U 4
R 4
D 12
R 4
U 11
L 7
R 2
U 12
R 2
D 12
R 9
L 2
R 9
L 5
U 1
R 5
U 12
L 9
U 7
R 12
D 12
L 12
D 7
L 2
D 9
U 10
R 10
U 3
R 9
D 10
U 4
L 3
U 1
D 2
L 10
U 2
L 10
U 6
R 1
D 5
U 2
L 8
U 12
R 10
U 11
D 10
U 13
D 6
R 11
L 9
U 4
D 5
L 9
U 4
L 5
D 10
U 4
L 9
R 6
D 8
U 10
R 6
L 5
R 13
L 6
R 3
U 11
L 1
U 6
D 6
U 8
D 11
R 3
L 7
R 8
L 11
R 3
U 3
L 2
R 2
D 12
R 3
U 6
R 1
U 11
R 9
U 6
R 12
L 7
D 12
L 6
R 8
D 12
L 1
R 12
D 10
R 2
U 7
L 5
D 6
U 6
D 2
R 13
U 1
D 3
U 5
R 12
L 1
D 12
R 2
D 8
L 12
R 5
L 13
U 4
R 4
L 4
R 12
U 7
D 3
L 12
R 2
D 5
L 13
D 1
L 8
U 13
L 10
U 5
R 10
U 3
L 8
R 4
L 10
D 3
U 4
D 6
L 6
R 11
U 3
D 5
L 4
R 1
U 3
R 2
L 12
R 5
D 7
L 2
U 9
R 5
D 2
U 10
D 7
L 14
U 1
R 1
D 2
U 7
L 13
R 13
D 8
L 3
U 11
R 8
U 8
D 9
U 10
R 2
D 3
U 14
R 12
L 13
R 2
D 13
R 5
D 10
R 12
D 5
R 13
D 4
L 3
U 1
L 5
R 4
L 12
U 5
D 11
U 6
L 1
D 9
R 9
U 1
R 9
D 14
R 6
L 4
R 8
L 9
R 7
L 1
D 8
R 1
L 12
D 12
L 9
U 11
D 1
R 9
U 7
R 14
D 5
R 7
U 5
D 4
R 6
D 1
L 12
U 8
D 4
L 2
U 4
L 6
U 2
D 4
L 11
U 5
R 1
U 5
D 3
U 12
L 1
D 3
L 14
D 6
R 9
U 7
L 14
D 10
L 11
R 1
D 11
R 7
D 8
U 14
L 9
D 11
R 8
D 6
R 11
D 12
R 12
D 7
L 14
R 14
D 13
R 5
L 11
R 3
L 15
R 12
D 9
L 8
R 15
U 3
L 3
D 5
R 13
U 4
L 4
U 1
L 3
R 6
L 9
R 13
D 9
R 14
U 3
L 7
R 2
L 15
R 6
L 12
U 1
L 9
D 7
R 8
L 12
R 2
U 3
R 1
L 10
U 2
L 6
R 3
D 14
L 11
D 10
U 4
D 1
R 15
D 8
R 3
U 3
R 2
U 3
L 2
R 11
D 15
R 4
U 14
D 11
L 12
R 6
D 14
L 5
D 3
R 5
D 9
R 2
D 11
R 5
D 10
R 13
L 11
U 13
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