108 lines
2.1 KiB
Markdown
108 lines
2.1 KiB
Markdown
You decide to visit the archipelagos of Indonesia. You find a map of the area near South Sulawesi,
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and can see where there is land (marked with an `X`), and where the ocean is (empty space).
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You and your friends decide you want to stay at the islands for the weekend.
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However, there are so many islands to pick from, and you have no way to decide which one to pick to
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stay at. To make a decision, you come up with a plan.
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Firstly, you have decided that the location needs to be a peninsula. That means, water on 3 sides,
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and land on one side.
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### Note:
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> When counting peninsulas, do not consider diagonal tiles. Only consider those directly to the left,
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> right, above and below the tile.
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> The (invisible) edges of the input all count after the water tiles.
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### Example
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Given the following input:
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```
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ABCDE
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1. X XX
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2. X X
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3. X
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4. XX X
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```
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Contains 4 peninsulas:
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* 1D
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* 3D
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* 4A
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* 4B
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---
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Given the following input:
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```
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ABCDEFGH
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1 XXX XX
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2 X XX X
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3 XXXXX X
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4 X X
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5 X XXXX
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6 XX XXXX
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```
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Contains 9 peninsulas:
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* 1C
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* 1H
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* 2B
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* 3A
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* 4D
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* 5A
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* 5H
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* 6B
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* 6D
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To get the answer for part one, **what is the total number of peninsulas you can count on your
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map?**
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{{ if .Part1.Completed -}}
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**Congratulations! You got Part 1 correct. Your answer was `{{ .Part1.Solution }}`.**
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## Part 2
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With the number of peninsulas that are in the lake, you are having trouble determining which one to
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pick. In order to do so, you have devised a plan to try to see which island has the most number of
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peninsulas.
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In order to do this, though, we first need to count how many islands we have.
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An island is a contiguous set of grids, that are connected by water in at least one of the four
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directions, similar to a peninsula.
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### Example
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Given the following input:
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```
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ABCDEFGH
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1 XXX XX
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2 X XX X
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3 XXXXX X
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4 X X
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5 X XXXX
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6 XX XXXX
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```
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There are 3 distinct islands.
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**What is the total number of islands in your map?**
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{{ if .Part2.Completed -}}
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**Congratulations! You have completed both parts! The answer was `{{ .Part2.Solution }}`.**
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{{- end }}
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{{- end }}
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