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# -*- coding: utf-8 -*-
import re
from abc import ABC
from collections import namedtuple
from dataclasses import dataclass, field
from typing import Tuple, Iterator, Any, Set, Union
from typing import Tuple, Iterator, Any, Set, List
from aoc import BaseAssignment
class Coordinate(namedtuple("Coordinate", ["x", "y"])):
def distance(self, other: "Coordinate"):
return abs(self.x - other.x) + abs(self.y - other.y)
@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.distance(self.nearest)
def within_radius(self, coordinate: Coordinate) -> bool:
distance = self.coordinate.distance(coordinate)
return distance <= self.radius
def x_coordinates_within_radius_at(self, y: int, map: "Map") -> 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
return range(
max(self.coordinate.x - left_over, map.width[0]),
min(self.coordinate.x + left_over + 1, map.width[-1]),
)
@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, map)
}
return len(x_coordinates) - len(
[beacon.x for beacon in map.beacons if beacon.y == y]
)
class AssignmentTwo(Assignment):
pass
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