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# -*- coding: utf-8 -*-
import re
from abc import ABC
from dataclasses import dataclass, field
from typing import Tuple, Iterator, Set, List
from typing import Union
from aoc import BaseAssignment
from aoc.datastructures import Coordinate
@dataclass
class Sensor:
coordinate: Coordinate
nearest: Coordinate
radius: int = None
def __hash__(self):
return hash(self.coordinate)
def __post_init__(self):
self.radius = self.coordinate.manhattan_distance(self.nearest)
def within_radius(self, coordinate: Coordinate) -> bool:
distance = self.coordinate.manhattan_distance(coordinate)
return distance <= self.radius
def x_coordinates_within_radius_at(
self, y: int, min_x: int = None, max_x: int = None
) -> Union[range, list]:
coordinate = Coordinate(self.coordinate.x, y)
if not self.within_radius(coordinate):
return []
dy = abs(self.coordinate.y - y)
left_over = self.radius - dy
left_x = self.coordinate.x - left_over
right_x = self.coordinate.x + left_over
return range(
max(left_x, min_x if min_x is not None else left_x - 1),
min(right_x, max_x if max_x is not None else right_x + 1) + 1,
)
def area_inside(self) -> Set[Coordinate]:
coordinates = set()
for y in range(
self.coordinate.y - (self.radius - 1), self.coordinate.y + self.radius
):
for x in self.x_coordinates_within_radius_at(y):
coordinates.add(Coordinate(x, y))
return coordinates
@dataclass
class Map:
sensors: List[Sensor] = field(default_factory=list)
beacons: Set[Coordinate] = field(default_factory=set)
def __post_init__(self):
all_coordinates = self.beacons | {sensor.coordinate for sensor in self.sensors}
min_x = min(c.x for c in all_coordinates)
max_x = max(c.x for c in all_coordinates)
min_y = min(c.y for c in all_coordinates)
max_y = max(c.y for c in all_coordinates)
self.width = list(range(min_x, max_x + 1))
self.height = list(range(min_y, max_y + 1))
input_pattern = re.compile("x=(-?[-0-9]+), y=(-?[0-9]+)")
class Assignment(BaseAssignment[int, Tuple[Sensor, Coordinate]], ABC):
def parse_item(self, line: str) -> Tuple[Sensor, Coordinate]:
match = input_pattern.findall(line)
if len(match) != 2:
raise RuntimeError()
sensor_match, beacon_match = match
beacon = Coordinate(int(beacon_match[0]), int(beacon_match[1]))
sensor = Sensor(Coordinate(int(sensor_match[0]), int(sensor_match[1])), beacon)
return sensor, beacon
def create_map(self, input: Iterator[Tuple[Sensor, Coordinate]]) -> Map:
sensors = list()
beacons = set()
for sensor, beacon in input:
sensors.append(sensor)
beacons.add(beacon)
return Map(sensors, beacons)
class AssignmentOne(Assignment):
example_result = 26
example_kwargs = {"y": 10}
# Wrong: 4062163
def run(self, input: Iterator[Tuple[Sensor, Coordinate]], y=2000000):
map = self.create_map(input)
x_coordinates = {
x
for sensor in map.sensors
for x in sensor.x_coordinates_within_radius_at(y)
}
return len(x_coordinates) - len(
[beacon.x for beacon in map.beacons if beacon.y == y]
)
class AssignmentTwo(Assignment):
example_result = 56000011
example_kwargs = {"max": 20}
def run(self, input: Iterator[Tuple[Sensor, Coordinate]], max=4000000):
map = self.create_map(input)
coordinates = {Coordinate(x, y) for x in range(max) for y in range(max)}
print("Coordinates generated")
for sensor in map.sensors:
coordinates -= sensor.area_inside()
distress_beacon = (coordinates - map.beacons).pop()
return (distress_beacon.x * 4000000) + distress_beacon.y
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