58 lines
3.4 KiB
Markdown
58 lines
3.4 KiB
Markdown
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# Day 1: Calorie Counting
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[https://adventofcode.com/2022/day/1](https://adventofcode.com/2022/day/1)
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## Description
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### Part One
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Santa's reindeer typically eat regular reindeer food, but they need a lot of [magical energy](https://adventofcode.com/2018/day/25) to deliver presents on Christmas. For that, their favorite snack is a special type of _star_ fruit that only grows deep in the jungle. The Elves have brought you on their annual expedition to the grove where the fruit grows.
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To supply enough magical energy, the expedition needs to retrieve a minimum of _fifty stars_ by December 25th. Although the Elves assure you that the grove has plenty of fruit, you decide to grab any fruit you see along the way, just in case.
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Collect stars by solving puzzles. Two puzzles will be made available on each day in the Advent calendar; the second puzzle is unlocked when you complete the first. Each puzzle grants _one star_. Good luck!
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The jungle must be too overgrown and difficult to navigate in vehicles or access from the air; the Elves' expedition traditionally goes on foot. As your boats approach land, the Elves begin taking inventory of their supplies. One important consideration is food - in particular, the number of _Calories_ each Elf is carrying (your puzzle input).
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The Elves take turns writing down the number of Calories contained by the various meals, snacks, rations, <span title="By "etc", you're pretty sure they just mean "more snacks".">etc.</span> that they've brought with them, one item per line. Each Elf separates their own inventory from the previous Elf's inventory (if any) by a blank line.
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For example, suppose the Elves finish writing their items' Calories and end up with the following list:
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1000
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2000
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3000
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4000
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5000
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6000
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7000
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8000
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9000
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10000
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This list represents the Calories of the food carried by five Elves:
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* The first Elf is carrying food with `1000`, `2000`, and `3000` Calories, a total of `6000` Calories.
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* The second Elf is carrying one food item with `4000` Calories.
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* The third Elf is carrying food with `5000` and `6000` Calories, a total of `11000` Calories.
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* The fourth Elf is carrying food with `7000`, `8000`, and `9000` Calories, a total of `24000` Calories.
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* The fifth Elf is carrying one food item with `10000` Calories.
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In case the Elves get hungry and need extra snacks, they need to know which Elf to ask: they'd like to know how many Calories are being carried by the Elf carrying the _most_ Calories. In the example above, this is `24000` (carried by the fourth Elf).
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Find the Elf carrying the most Calories. _How many total Calories is that Elf carrying?_
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### Part Two
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By the time you calculate the answer to the Elves' question, they've already realized that the Elf carrying the most Calories of food might eventually _run out of snacks_.
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To avoid this unacceptable situation, the Elves would instead like to know the total Calories carried by the _top three_ Elves carrying the most Calories. That way, even if one of those Elves runs out of snacks, they still have two backups.
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In the example above, the top three Elves are the fourth Elf (with `24000` Calories), then the third Elf (with `11000` Calories), then the fifth Elf (with `10000` Calories). The sum of the Calories carried by these three elves is `45000`.
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Find the top three Elves carrying the most Calories. _How many Calories are those Elves carrying in total?_
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