113 lines
2.2 KiB
Python
113 lines
2.2 KiB
Python
with open('input.text', 'r') as file:
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data: list[str] = file.readlines()
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y_bound = len(data)
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x_bound = len(data[0])
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class Vector:
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x: int
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y: int
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def __init__(self, x: int, y: int):
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self.x = x
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self.y = y
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def __add__(self, other):
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return Vector(self.x + other.x, self.y + other.y)
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def __str__(self):
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return f'{self.x}, {self.y}'
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def __eq__(self, value):
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return self.x == value.x and self.y == value.y
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class Guard:
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pos: Vector
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dir: Vector
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def __init__(self, p: Vector, d: Vector):
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self.pos = p
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self.dir = d
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def move(self, ob) -> Vector | None | int:
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new_pos = self.pos + self.dir
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# Check if need to turn
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if new_pos in ob:
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return new_pos
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# Check if move out of bounds
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if new_pos.y < 0 or new_pos.y >= y_bound or new_pos.x < 0 or new_pos.x >= x_bound:
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return -1
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self.pos = new_pos
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return None
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def turn(self):
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temp_x = self.dir.x
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self.dir.x = -self.dir.y
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self.dir.y = temp_x
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# Parse Data
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obstacles = []
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guard = None
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for y, line in enumerate(data):
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for x, char in enumerate(line):
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match char:
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case '#':
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obstacles.append(Vector(x, y))
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case '^':
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guard = Guard(Vector(x, y), Vector(0, -1))
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starting_pos = guard.pos
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# Part 1
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been = [starting_pos]
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while True:
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ob = guard.move(obstacles)
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if type(ob) == Vector:
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guard.turn()
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elif type(ob) == int:
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break
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if guard.pos not in been:
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been.append(guard.pos)
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print(f'Part 1: {len(been)}')
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# Part 2
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total = 0
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been.remove(starting_pos)
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for i, place in enumerate(been):
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print(i)
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temp_obstacles = obstacles.copy()
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temp_obstacles.append(place)
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guard.pos = starting_pos
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guard.dir = Vector(0, -1)
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steps = 0
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while True:
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ob = guard.move(temp_obstacles)
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if type(ob) == Vector:
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guard.turn()
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elif type(ob) == int:
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break
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else:
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steps += 1
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# Yup, this is what I count as in a loop...
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if steps >= 6500:
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total += 1
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break
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print(f'Part 2: {total}')
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