Jake Pullen
106 lines
3.2 KiB
Python
106 lines
3.2 KiB
Python
from queue import Queue
|
|
# import os
|
|
|
|
with open(r'advent_of_code\2023\day_11\input.txt', 'r') as file:
|
|
input = file.readlines()
|
|
|
|
# print(input)
|
|
|
|
test_input = '''...#......
|
|
.......#..
|
|
#.........
|
|
..........
|
|
......#...
|
|
.#........
|
|
.........#
|
|
..........
|
|
.......#..
|
|
#...#.....'''
|
|
|
|
#print(test_input)
|
|
#input = test_input.split('\n')
|
|
|
|
def expand_universe(input):
|
|
'''add an extra row or column of empty spaces to each row or column that has no # in it'''
|
|
print('Expanding universe')
|
|
# expand empty rows
|
|
new_input = []
|
|
for row in input:
|
|
if '#' in row:
|
|
new_input.append(row)
|
|
else:
|
|
new_input.append(row)
|
|
new_input.append(row)
|
|
|
|
# expand empty columns
|
|
|
|
# Transpose the input
|
|
transposed_input = list(map(list, zip(*new_input)))
|
|
|
|
new_input = []
|
|
for row in transposed_input:
|
|
if '#' in row:
|
|
new_input.append(row)
|
|
else:
|
|
new_input.append(row)
|
|
new_input.append(row)
|
|
|
|
# Transpose the input back
|
|
new_input = list(map(list, zip(*new_input)))
|
|
|
|
# Convert rows back to strings
|
|
new_input = [''.join(row) for row in new_input]
|
|
|
|
return new_input
|
|
|
|
input = expand_universe(input)
|
|
|
|
def number_galaxies(input):
|
|
'''gives a unique number to each galaxy(#) in the input grid'''
|
|
print('Numbering galaxies')
|
|
# make a copy of the input
|
|
input_copy = [list(row) for row in input] # Convert strings to lists
|
|
# replace the galaxies with their numbers
|
|
galaxy_number = 1
|
|
galaxy_coordinates = {} # This dictionary will store the coordinates of each galaxy
|
|
for i in range(len(input_copy)):
|
|
for j in range(len(input_copy[i])):
|
|
if input_copy[i][j] == '#':
|
|
input_copy[i][j] = str(galaxy_number) # Convert number back to string
|
|
galaxy_coordinates[galaxy_number] = (i, j) # Store the coordinates of the galaxy
|
|
galaxy_number += 1 # Increment the galaxy number
|
|
# Convert lists back to strings
|
|
input_copy = [''.join(row) for row in input_copy]
|
|
return input_copy, galaxy_coordinates
|
|
|
|
input, galaxy_coordinates = number_galaxies(input)
|
|
#print(galaxy_coordinates)
|
|
|
|
def manhattan_distance(point1, point2):
|
|
return abs(point1[0] - point2[0]) + abs(point1[1] - point2[1])
|
|
|
|
# find the shortest path between each pair of galaxies
|
|
print('Finding the shortest path between each pair of galaxies')
|
|
galaxy_distances = {}
|
|
for galaxy in galaxy_coordinates:
|
|
galaxy_distances[galaxy] = {}
|
|
for other_galaxy in galaxy_coordinates:
|
|
if galaxy != other_galaxy:
|
|
galaxy_distances[galaxy][other_galaxy] = manhattan_distance(galaxy_coordinates[galaxy], galaxy_coordinates[other_galaxy])
|
|
#print(galaxy_distances)
|
|
|
|
# remove the duplicate distances ie 1->2 and 2->1
|
|
print('Removing the duplicate distances')
|
|
for galaxy in galaxy_distances:
|
|
for other_galaxy in galaxy_distances[galaxy]:
|
|
if other_galaxy in galaxy_distances:
|
|
del galaxy_distances[other_galaxy][galaxy]
|
|
#print(galaxy_distances)
|
|
|
|
# sum up all the distances
|
|
print('Summing up all the distances')
|
|
total_distance = 0
|
|
for galaxy in galaxy_distances:
|
|
for other_galaxy in galaxy_distances[galaxy]:
|
|
total_distance += galaxy_distances[galaxy][other_galaxy]
|
|
print(total_distance) |