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14.py
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14.py
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# -*- coding: utf-8 -*-
"""
Created on Mon Dec 4 06:32:12 2023
@author: stjse
"""
from aoc_class import AOC
from timeit import default_timer as timer
import matplotlib.pyplot as plt
class Coords():
def __init__(self, row, col):
self.row = row
self.col = col
def __repr__(self):
return f'[Coords: [row: {self.row}, col: {self.col}]]>'
class Stones():
def __init__(self, row, col, fixed):
self.row = row
self.col = col
self.fixed = fixed
self.coords = Coords(row, col)
def __repr__(self):
return f'[Stone: [{self.row}, {self.col}]; fixed: <{self.fixed}]>'
class Today(AOC):
def __init__(self, day, simple):
AOC.__init__(self, day)
self.rock = '#'
self.roll = 'O'
def parse_lines(self, file_path=''):
lines = self.lines
return lines
def part1(self):
lines = self.parse_lines()
columns = self.transpose_lines(lines)
weight = 0
for col in columns:
stackheight = len(col)
for i, char in enumerate(col):
if char == self.rock:
stackheight = len(col) - (i+1)
elif char == self.roll:
weight += stackheight
stackheight -= 1
self.result1 = weight
self.time1 = timer()
return self.result1
def get_rock_ranks(self):
rows = len(self.lines)
columns = len(self.lines[0])
rockranks = {}
for row in range(rows):
rockranks[(row, -1)] = [stone for stone in self.fixpos if stone.row == row]
for col in range(columns):
rockranks[(-1, col)] = [stone for stone in self.fixpos if stone.col == col]
self.rockranks = rockranks
def slide(self, direction):
# for each possible direction, for the given rank (row or column number)
# first get all stones on that rank
# then move all stones as far as possible
if direction in ['north', 'south']:
for col in range(len(self.lines[0])):
fixed = self.rockranks[(-1, col)]
rankstones = [stone for stone in self.loose if stone.col == col]
if direction == 'north':
steps = 1
stackheight = 0
reverse = False
else:
steps = -1
stackheight = len(self.lines) -1
reverse = True
all_rankstones = fixed + rankstones
all_rankstones.sort(key=lambda x: x.row, reverse=reverse) # sort by their direction
for i, stone in enumerate(all_rankstones):
if stone.fixed:
stackheight = stone.row + steps
else:
all_rankstones[i].row = stackheight
stackheight += + steps
if direction in ['west', 'east']:
for row in range(len(self.lines)):
fixed = self.rockranks[(row, -1)]
rankstones = [stone for stone in self.loose if stone.row == row]
if direction == 'west':
steps = 1
stackheight = 0
reverse = False
else:
steps = -1
stackheight = len(self.lines[0])-1
reverse = True
all_rankstones = fixed + rankstones
all_rankstones.sort(key=lambda x: x.col, reverse=reverse) # sort by their direction
for i, stone in enumerate(all_rankstones):
if stone.fixed:
stackheight = stone.col + steps
else:
all_rankstones[i].col = stackheight
stackheight += + steps
def calc_north_weight(self):
return sum([len(self.lines) - stone.row for stone in self.loose])
def part2(self):
lines = self.parse_lines()
stones = []
self.directions = ['north', 'west','south', 'east']
for row in range(len(lines)):
for col in range(len(lines[0])):
char = lines[row][col]
if char != '.':
stones.append(Stones(row, col, fixed=char==self.rock))
self.loose = {stone for stone in stones if not stone.fixed}
self.fixed = {stone for stone in stones if stone.fixed}
self.fixpos = {stone for stone in self.fixed}
self.get_rock_ranks()
weights = {}
self.turn = -1
# self.plot_stones()
repeated = False
extend = 400
start = 1
while not repeated:
end = start + extend
print(f'running from {start} to {end}')
for i in range(start, end):
self.turn = i
self.direction = self.directions[(i-1)%4]
self.slide(self.direction)
north_weight = self.calc_north_weight()
weights[i] = north_weight
self.weights = weights
self.result2 = weights
pickup = (end // 2) + (end // 2)%4 # starting to watch for repetitions this value while ensuring it is after a drift eastwards
i = 5
while not repeated and i*2 <= end:
if list(self.weights.values())[pickup:pickup+i] == list(self.weights.values())[pickup+i:pickup+i*2]:
repeated = True
print(i, list(self.weights.values())[pickup:pickup+i], list(self.weights.values())[pickup+i:pickup+i*2])
period = i
else:
i += 1
start += extend
print(f'starting from {pickup}, the sequence repeates itself every {i//4} full cycles ({i} slides towards a new direction.)')
length = (1000000000 * 4 - pickup) % period
self.result2 = self.weights[pickup+length]
self.time2 = timer()
return self.result2
def plot_stones(self):
rows = len(self.lines)
cols = len(self.lines[0])
# Sample coordinates for rock and roll
rock = [(abs(stone.col-cols), abs(stone.row-rows)) for stone in self.fixed]
roll = [(abs(stone.col-cols), abs(stone.row-rows)) for stone in self.loose]
# Extract x and y values from the lists
x_a, y_a = zip(*rock)
x_b, y_b = zip(*roll)
# Create a scatter plot
plt.scatter(x_a, y_a, marker='X', label='fixed')
plt.scatter(x_b, y_b, marker='o', label='loose')
# Add labels and legend
plt.xlabel('X-axis')
plt.ylabel('Y-axis')
plt.legend()
# Set equal spacing for x and y axes
plt.axis('equal')
if self.turn == -1:
plt.title(f'This is turn {self.turn + 1}')
else:
plt.title(f'This is [Cycle {self.turn//4+1}] turn {self.turn}. Just turned {self.direction}')
plt.xticks(range(int(min(min(x_a), min(x_b))), int(max(max(x_a), max(x_b))) + 1))
plt.yticks(range(int(min(min(y_a), min(y_b))), int(max(max(y_a), max(y_b))) + 1))
# Invert the x-axis
plt.gca().invert_xaxis()
plt.grid(True)
# Show the plot
plt.show()
def print_final(self):
print(f'Part 1 result is: {self.result1}. (time: {round(self.time1 - self.beginning_of_time, 2)})')
print(f'Part 2 result is: {self.result2} (time: {round(self.time2 - self.time1, 2)})')
if __name__ == '__main__':
# prep
today = Today(day='14', simple=True)
today.create_txt_files()
# simple part 1
today.set_lines(simple=True)
today.part1()
print(f'Part 1 <SIMPLE> result is: {today.result1}')
# hard part 1
today.set_lines(simple=False)
today.part1()
print(f'Part 1 <HARD> result is: {today.result1}')
today.stop()
# simple part 2
today.set_lines(simple=True)
today.part2()
print(f'Part 2 <SIMPLE> result is: {today.result2}')
# hard part 2
today.set_lines(simple=False)
today.part2()
print(f'Part 2 <HARD> result is: {today.result2}')
today.stop()
today.print_final()