Jake Pullen
71 lines
1.8 KiB
Python
71 lines
1.8 KiB
Python
import re
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with open(r'advent_of_code\2023\01\input.txt', 'r') as file:
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input = file.read()
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def text_to_num(line: str) -> str:
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'''Returns the line with the text numbers replaced with digits
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input: line - string of characters
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output: a string
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example:
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input: 'eightwothree'
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output: '8wo3'
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'''
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text_to_num = {
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"zero": "0",
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"one": "one1one",
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"two": "two2two",
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"three": "three3three",
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"four": "four4four",
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"five": "five5five",
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"six": "six6six",
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"seven": "seven7seven",
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"eight": "eight8eight",
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"nine": "nine9nine"
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}
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#replace a text number with a digit surrounded by the same text numberm to resolve overlaps
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for key, value in text_to_num.items():
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if key in line:
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line = line.replace(key, value)
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return line
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def grab_first_and_last_digit(line: str) -> (int):
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'''Returns the first and last digit of the given line
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input: line - string of characters
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output: a 2 digit integer
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example:
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input: 'pqr3stu8vwx'
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output: 38
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'''
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first_digit = re.findall(r'\d', line)[0]
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last_digit = re.findall(r'\d', line)[-1]
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return int(first_digit + last_digit)
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def day_1_solution(input:str) -> int:
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'''Returns the sum of the first and last digit of each line
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input: input - string of characters
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output: an integer
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example:
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input: '1abc2\npqr3stu8vwx\na1b2c3d4e5f\ntreb7uchet'
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output: 48
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'''
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list = []
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for line in input.split('\n'):
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line = text_to_num(line)
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list.append(grab_first_and_last_digit(line))
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return sum(list)
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test_input = 'two1nine\neightwothree\nabcone2threexyz\nxtwone3four\n4nineeightseven2\nzoneight234\n7pqrstsixteen'
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day_1_test = day_1_solution(test_input)
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print(day_1_test)
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assert day_1_test == 281
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day_1_answer = day_1_solution(input)
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print(day_1_answer)
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