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part2.py
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part2.py
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# Description: Day 3 Part 2 of Advent of Code
import string
def is_adjacent_to_digits(lines: list[str], line_index: int, char_index: int) -> list:
"""Returns a list of positions of the adjacent digits"""
length_of_line = len(lines[line_index])
length_of_lines = len(lines)
digits_positions = []
if line_index == 0:
if char_index == 0:
if lines[line_index][char_index+1] in string.digits:
digits_positions.append([line_index, char_index+1])
if lines[line_index+1][char_index] in string.digits:
digits_positions.append([line_index+1, char_index])
if lines[line_index+1][char_index+1] in string.digits:
digits_positions.append([line_index+1, char_index+1])
elif char_index == length_of_line - 1:
if lines[line_index][char_index-1] in string.digits:
digits_positions.append([line_index, char_index-1])
if lines[line_index+1][char_index] in string.digits:
digits_positions.append([line_index+1, char_index])
if lines[line_index+1][char_index-1] in string.digits:
digits_positions.append([line_index+1, char_index-1])
else:
if lines[line_index][char_index-1] in string.digits:
digits_positions.append([line_index, char_index-1])
if lines[line_index][char_index+1] in string.digits:
digits_positions.append([line_index, char_index+1])
if lines[line_index+1][char_index] in string.digits:
digits_positions.append([line_index+1, char_index])
if lines[line_index+1][char_index-1] in string.digits:
digits_positions.append([line_index+1, char_index-1])
if lines[line_index+1][char_index+1] in string.digits:
digits_positions.append([line_index+1, char_index+1])
elif line_index == length_of_lines - 1:
if char_index == 0:
if lines[line_index][char_index+1] in string.digits:
digits_positions.append([line_index, char_index+1])
if lines[line_index-1][char_index] in string.digits:
digits_positions.append([line_index-1, char_index])
if lines[line_index-1][char_index+1] in string.digits:
digits_positions.append([line_index-1, char_index+1])
elif char_index == length_of_line - 1:
if lines[line_index][char_index-1] in string.digits:
digits_positions.append([line_index, char_index-1])
if lines[line_index-1][char_index] in string.digits:
digits_positions.append([line_index-1, char_index])
if lines[line_index-1][char_index-1] in string.digits:
digits_positions.append([line_index-1, char_index-1])
else:
if lines[line_index][char_index-1] in string.digits:
digits_positions.append([line_index, char_index-1])
if lines[line_index][char_index+1] in string.digits:
digits_positions.append([line_index, char_index+1])
if lines[line_index-1][char_index] in string.digits:
digits_positions.append([line_index-1, char_index])
if lines[line_index-1][char_index-1] in string.digits:
digits_positions.append([line_index-1, char_index-1])
if lines[line_index-1][char_index+1] in string.digits:
digits_positions.append([line_index-1, char_index+1])
else:
if char_index == 0:
if lines[line_index][char_index+1] in string.digits:
digits_positions.append([line_index, char_index+1])
if lines[line_index-1][char_index] in string.digits:
digits_positions.append([line_index-1, char_index])
if lines[line_index-1][char_index+1] in string.digits:
digits_positions.append([line_index-1, char_index+1])
if lines[line_index+1][char_index] in string.digits:
digits_positions.append([line_index+1, char_index])
if lines[line_index+1][char_index+1] in string.digits:
digits_positions.append([line_index+1, char_index+1])
elif char_index == length_of_line - 1:
if lines[line_index][char_index-1] in string.digits:
digits_positions.append([line_index, char_index-1])
if lines[line_index-1][char_index] in string.digits:
digits_positions.append([line_index-1, char_index])
if lines[line_index-1][char_index-1] in string.digits:
digits_positions.append([line_index-1, char_index-1])
if lines[line_index+1][char_index] in string.digits:
digits_positions.append([line_index+1, char_index])
if lines[line_index+1][char_index-1] in string.digits:
digits_positions.append([line_index+1, char_index-1])
else:
if lines[line_index][char_index-1] in string.digits:
digits_positions.append([line_index, char_index-1])
if lines[line_index][char_index+1] in string.digits:
digits_positions.append([line_index, char_index+1])
if lines[line_index-1][char_index] in string.digits:
digits_positions.append([line_index-1, char_index])
if lines[line_index-1][char_index-1] in string.digits:
digits_positions.append([line_index-1, char_index-1])
if lines[line_index-1][char_index+1] in string.digits:
digits_positions.append([line_index-1, char_index+1])
if lines[line_index+1][char_index] in string.digits:
digits_positions.append([line_index+1, char_index])
if lines[line_index+1][char_index-1] in string.digits:
digits_positions.append([line_index+1, char_index-1])
if lines[line_index+1][char_index+1] in string.digits:
digits_positions.append([line_index+1, char_index+1])
return digits_positions
def get_number(line: str, line_index: int, char_index: int) -> int:
"""Returns the number at the position"""
number = ''
number_positions = []
char = line[char_index]
char_index_save = char_index
length_of_line = len(line)
while char in string.digits:
number += char
number_positions.append([line_index, char_index])
char_index -= 1
if char_index == -1:
break
char = line[char_index]
number = number[::-1]
char_index = char_index_save + 1
if char_index != length_of_line:
char = line[char_index]
while char in string.digits:
number += char
number_positions.append([line_index, char_index])
char_index += 1
if char_index == length_of_line:
break
char = line[char_index]
return number, number_positions
def solution(textfile: str) -> int:
"""Returns the sum of the line's engine part"""
# Artifact due to change of the template
lines = textfile.splitlines()
lines = [line+"\n" for line in lines]
lines[-1] = lines[-1][:-1]
# End of artifact
sum_of_engine_part = 0
for line_index, line in enumerate(lines):
for char_index, char in enumerate(line):
if char == "*":
digits_positions = is_adjacent_to_digits(lines, line_index, char_index)
if len(digits_positions) == 0:
continue
numbers = []
position_already_used = []
for digit_position in digits_positions:
number, number_positions = get_number(lines[digit_position[0]], digit_position[0], digit_position[1])
already_used = False
for position in number_positions:
if position in position_already_used:
already_used = True
break
if already_used:
continue
numbers.append(int(number))
position_already_used.extend(number_positions)
if len(numbers) == 2:
sum_of_engine_part += numbers[0] * numbers[1]
return sum_of_engine_part