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from __future__ import annotations
from collections import deque
from collections.abc import Iterable, Iterator
from dataclasses import dataclass
from itertools import islice
from math import sqrt
from sys import argv
from typing import TypeVar, Generic, Union, Optional, cast
NumT = TypeVar('NumT', float, int)
@dataclass(frozen=True)
class Point2D(Generic[NumT]):
x: NumT
y: NumT
def __str__(self) -> str:
return f'({self.x}, {self.y})'
def __add__(self, other: Point2D[NumT]) -> Union[Point2D[NumT], bool]:
if isinstance(other, Point2D):
return Point2D(self.x + other.x, self.y + other.y)
return NotImplemented
def __sub__(self, other: Point2D[NumT]) -> Union[Point2D[NumT], bool]:
if isinstance(other, Point2D):
return Point2D(self.x - other.x, self.y - other.y)
return NotImplemented
def __abs__(self) -> Point2D[NumT]:
return Point2D(cast(NumT, abs(self.x)), cast(NumT, abs(self.y)))
def norm_1(p: Point2D[NumT]) -> NumT:
return cast(NumT, abs(p.x) + abs(p.y))
def norm_2(p: Point2D) -> float:
return sqrt(p.x ** 2 + p.y ** 2)
def norm_inf(p: Point2D[NumT]) -> NumT:
return cast(NumT, max(abs(p.x), abs(p.y)))
def inbounds(p: Point2D[NumT], a: Point2D[NumT], _b: Optional[Point2D[NumT]] = None) -> bool:
if isinstance(_b, Point2D):
b = _b
else:
b = a
a = cast(Point2D[NumT], Point2D(0, 0) if isinstance(a.x, int) else Point2D(0.0, 0.0))
return p.x >= a.x and p.y >= a.y and p.x < b.x and p.y < b.y
def adjacent(p: Point2D[int], diagonal: bool = True) -> Iterator[Point2D[int]]:
for dx in range(-1, 2):
for dy in range(-1, 2):
if dx == 0 and dy == 0: continue
if dx != 0 and dy != 0 and not adjacent: continue
yield Point2D(p.x + dx, p.y + dy)
def adjacent_bounded(p: Point2D[int], bound: Point2D[int], diagonal: bool = True) \
-> Iterator[Point2D[int]]:
return filter(lambda p: inbounds(p, bound), adjacent(p, diagonal))
T = TypeVar('T')
def sliding_window(iterable: Iterable[T], n: int) -> Iterator[tuple[T, ...]]:
# sliding_window('ABCDEFG', 4) -> ABCD BCDE CDEF DEFG
it: Iterator[T] = iter(iterable)
window: deque[T] = deque(islice(it, n), maxlen=n)
if len(window) == n:
yield tuple(window)
for x in it:
window.append(x)
yield tuple(window)
def open_day(n: int):
if len(argv) == 2:
return open(argv[1])
return open(f'{n}.in')
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