Advent-of-Code

Day 4 assignment

“Looks like the Chief’s not here. Next!” One of The Historians pulls out a device and pushes the only button on it. After a brief flash, you recognize the interior of the Ceres monitoring station!

-- Day 3 - Advent of Code 2024

Solution in Java

Full source can be found: in GitHub

Part 1

For the first part of today I chose to re-use my CharGrid class. With this I can iterate of all of the columns and rows looking for the X in any spot.

Day 3 assignment

“Our computers are having issues, so I have no idea if we have any Chief Historians in stock! You’re welcome to check the warehouse, though,” says the mildly flustered shopkeeper at the North Pole Toboggan Rental Shop. The Historians head out to take a look.

Day 3 - Advent of Code 2024

Solution in Java

Full source can be found: in GitHub

Part 1

For part 1 I decided to use a regular expression (line 4) to extract all the mul(x,y) instructions of the input. For each match we find the result is converted to a number using a multiplication (line 7). Finally all the results are reduced using the sum() operation.

Day 2 assignment

Fortunately, the first location The Historians want to search isn’t a long walk from the Chief Historian’s office.

While the Red-Nosed Reindeer nuclear fusion/fission plant appears to contain no sign of the Chief Historian, the engineers there run up to you as soon as they see you. Apparently, they still talk about the time Rudolph was saved through molecular synthesis from a single electron.

-- Day 2 - Advent of Code 2024

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Day 1 assignment

The Chief Historian is always present for the big Christmas sleigh launch, but nobody has seen him in months! Last anyone heard, he was visiting locations that are historically significant to the North Pole; a group of Senior Historians has asked you to accompany them as they check the places they think he was most likely to visit….

-- Day 1 - Advent of Code 2024

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As you try to figure out what to do next, you notice a poster on a wall near the ferry dock. “Boat races! Open to the public! Grand prize is an all-expenses-paid trip to Desert Island!” That must be where the sand comes from! Best of all, the boat races are starting in just a few minutes.

-- Day 6 - Advent of Code 2023

Solution in Java

Full source can be found: in GitHub

“Oh, we had to stop the water because we ran out of sand to filter it with! Can’t make snow with dirty water. Don’t worry, I’m sure we’ll get more sand soon; we only turned off the water a few days… weeks… oh no.” His face sinks into a look of horrified realization.

-- Day 5 - Advent of Code 2023

Solution in Java

Full source can be found: in GitHub

Tell you what: if you can help me with something quick, I’ll let you borrow my boat and you can go visit the gardener. I got all these scratchcards as a gift, but I can’t figure out what I’ve won."

-- Day 4 - Advent of Code 2023

Solution in Java

Full source can be found: in GitHub

Part 1

I created a class Card to represent the scratch cards from the assignment. Each card has a score() representing the amount of points of the card.

You and the Elf eventually reach a gondola lift station; he says the gondola lift will take you up to the water source, but this is as far as he can bring you. You go inside.

It doesn’t take long to find the gondolas, but there seems to be a problem: they’re not moving.

-- Day 3 - Advent of Code 2023

Solution in Java

Full source can be found: in GitHub

You’re launched high into the atmosphere! The apex of your trajectory just barely reaches the surface of a large island floating in the sky. You gently land in a fluffy pile of leaves. It’s quite cold, but you don’t see much snow. An Elf runs over to greet you.

-- Day 2 - Advent of Code 2023

Solution in Java

Full source can be found: in GitHub

Part 1

The first step for today is the parsing of the input string into Game instances. To do this I created a record representing a single game and a parsing method createGame that processes a single line of the input.

Something is wrong with global snow production, and you’ve been selected to take a look. The Elves have even given you a map; on it, they’ve used stars to mark the top fifty locations that are likely to be having problems.

-- Day 1 - Advent of Code 2023

Solution in Java

Full source can be found: in GitHub

Part 1

In the first part of this years Advent of Code we are requested to find the first and last digit in a string. The input will consists out of multiple of these strings.