54 lines
1.9 KiB
Markdown
54 lines
1.9 KiB
Markdown
# [Day 1](https://adventofcode.com/2023/day/1)
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## Assignment
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### Day 1: Trebuchet?!
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Something is wrong with global snow production,
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and you've been selected to take a look.
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The Elves have even given you a map;
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on it, they've used stars to mark the top fifty locations
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that are likely to be having problems.
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You've been doing this long enough to know that to restore snow operations,
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you need to check all fifty stars by December 25th.
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Collect stars by solving puzzles.
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Two puzzles will be made available on each day in the Advent calendar;
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the second puzzle is unlocked when you complete the first.
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Each puzzle grants one star. Good luck!
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You try to ask why they can't just use a weather machine ("not powerful enough")
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and where they're even sending you ("the sky") and why your map looks mostly blank
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("you sure ask a lot of questions") and hang on did you just say the sky
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("of course, where do you think snow comes from") when you realize
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that the Elves are already loading you into a trebuchet
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("please hold still, we need to strap you in").
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As they're making the final adjustments,
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they discover that their calibration document (your puzzle input)
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has been amended by a very young Elf who was apparently just excited to show off
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her art skills.
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Consequently, the Elves are having trouble reading the values on the document.
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The newly-improved calibration document consists of lines of text;
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each line originally contained a specific calibration value
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that the Elves now need to recover.
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**On each line, the calibration value can be found by combining the first digit
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and the last digit (in that order) to form a single two-digit number.**
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For example:
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```example
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1abc2
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pqr3stu8vwx
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a1b2c3d4e5f
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treb7uchet
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```
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In this example, the calibration values of these four lines are 12, 38, 15, and 77.
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Adding these together produces 142.
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Consider your entire calibration document.
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What is the sum of all of the calibration values?
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