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66 lines
No EOL
3.1 KiB
Markdown
66 lines
No EOL
3.1 KiB
Markdown
# Day 1
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Santa's reindeer typically eat regular reindeer food, but they need a lot of magical energy to deliver presents on
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Christmas. For that, their favorite snack is a special type of star fruit that only grows deep in the jungle. The Elves
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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
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the Elves assure you that the grove has plenty of fruit, you decide to grab any fruit you see along the way, just in
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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
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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
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traditionally goes on foot. As your boats approach land, the Elves begin taking inventory of their supplies. One
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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, etc. that
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they've brought with them, one item per line. Each Elf separates their own inventory from the previous Elf's inventory (
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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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```
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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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```
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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
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Calories are being carried by the Elf carrying the most Calories. In the example above, this is 24000 (carried by the
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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
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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
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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
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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? |