Advent of Code 2021

My solution to adventofcode 2021.

Language: Java

IDE: Visual Studio Code

Day 1: Sonar Sweep

Challenge: https://adventofcode.com/2021/day/1

Solution: SonarSweeper.java

Part One:

How many measurements are larger than the previous measurement?

Part Two:

How many sums are larger than the previous sum?

Day 2: Dive!

Challenge: https://adventofcode.com/2021/day/2

Solution: SubmarinePilot.java

Part One:

What do you get if you multiply your final horizontal position by your final depth?

Part Two:

What do you get if you multiply your final horizontal position by your final depth?

Day 3: Binary Diagnostic

Challenge: https://adventofcode.com/2021/day/3

Solution: SubmarineDiagnostor.java

Part One:

What is the power consumption of the submarine?

Part Two:

What is the life support rating of the submarine?

Day 4: Giant Squid

Challenge: https://adventofcode.com/2021/day/4

Solution: BingoSubsystem.java

Part One:

What will your final score be if you choose that board?

Part Two:

Once it wins, what would its final score be?

Day 5: Hydrothermal Venture

Challenge: https://adventofcode.com/2021/day/5

Solution: HydrothermalVentSaver.java

Part One:

Consider only horizontal and vertical lines. At how many points do at least two lines overlap?

Part Two:

Consider all of the lines. At how many points do at least two lines overlap?

Day 6: Lanternfish

Challenge: https://adventofcode.com/2021/day/6

Solution: LanternfishModel.java

Part One:

How many lanternfish would there be after 80 days?

Part Two:

How many lanternfish would there be after 256 days?

Day 7: The Treachery of Whales

Challenge: https://adventofcode.com/2021/day/7

Solution: CrabSubmarineFuelSaver.java

Part One:

How much fuel must they spend to align to that position?

Part Two:

How much fuel must they spend to align to that position?

Day 8: Seven Segment Search

Challenge: https://adventofcode.com/2021/day/8

Solution: SevenSegmentDecoder.java

Part One:

In the output values, how many times do digits 1, 4, 7, or 8 appear?

Part Two:

What do you get if you add up all of the output values?

Day 9: Smoke Basin

Challenge: https://adventofcode.com/2021/day/9

Solution: HeightmapReader.java

Part One:

What is the sum of the risk levels of all low points on your heightmap?

Part Two:

What do you get if you multiply together the sizes of the three largest basins?

Day 10: Syntax Scoring

Challenge: https://adventofcode.com/2021/day/10

Solution: SyntaxScorer.java

Part One:

What is the total syntax error score for those errors?

Part Two:

Find the completion string for each incomplete line, score the completion strings, and sort the scores. What is the middle score?

Day 11: Dumbo Octopus

Challenge: https://adventofcode.com/2021/day/11

Solution: OctopusFlashNavigator.java

Part One:

How many total flashes are there after 100 steps?

Part Two:

What is the first step during which all octopuses flash?

Day 12: Passage Pathing

Challenge: https://adventofcode.com/2021/day/12

Solution: PathExplorer.java

Part One:

How many paths through this cave system are there that visit small caves at most once?

Part Two:

Given these new rules, how many paths through this cave system are there?

Day 13: Transparent Origami

Challenge: https://adventofcode.com/2021/day/13

Solution: ManualDecoder.java

Part One:

How many dots are visible after completing just the first fold instruction on your transparent paper?

Part Two:

What code do you use to activate the infrared thermal imaging camera system?

Day 14: Extended Polymerization

Challenge: https://adventofcode.com/2021/day/14

Solution: PolymerFactory.java

Part One:

10 steps - What do you get if you take the quantity of the most common element and subtract the quantity of the least common element?

Part Two:

40 steps - What do you get if you take the quantity of the most common element and subtract the quantity of the least common element?