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frascufrascu
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add day 8
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‎2022/README.md

+2-1
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@@ -28,4 +28,5 @@ In the following table you can find my submissions.
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| 4 | [Camp Cleanup](https://adventofcode.com/2022/day/4) | :heavy_check_mark: Solved | :heavy_check_mark: Solved | [Day04.kt](src/main/kotlin/Day04.kt) |
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| 5 | [Supply Stacks](https://adventofcode.com/2022/day/5) | :heavy_check_mark: Solved | :heavy_check_mark: Solved | [Day05.kt](src/main/kotlin/Day05.kt) |
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| 6 | [Tuning Trouble](https://adventofcode.com/2022/day/6) | :heavy_check_mark: Solved | :heavy_check_mark: Solved | [Day06.kt](src/main/kotlin/Day06.kt) |
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| 7 | [No Space Left On Device](https://adventofcode.com/2022/day/7) | :heavy_check_mark: Solved | :heavy_check_mark: Solved | [Day07.kt](src/main/kotlin/Day07.kt) |
31+
| 7 | [No Space Left On Device](https://adventofcode.com/2022/day/7) | :heavy_check_mark: Solved | :heavy_check_mark: Solved | [Day07.kt](src/main/kotlin/Day07.kt) |
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| 8 | [Treetop Tree House](https://adventofcode.com/2022/day/8) | :heavy_check_mark: Solved | :heavy_check_mark: Solved | [Day08.kt](src/main/kotlin/Day08.kt) |

‎2022/src/main/kotlin/Day08.kt

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fun main() {
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fun isVisible(currentChar: Char, rows: List<String>, currentIndexCol: Int, currentIndexRow: Int) =
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(rows[currentIndexRow].subSequence(0, currentIndexCol).all { it.code < currentChar.code }
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|| rows[currentIndexRow].subSequence(currentIndexCol + 1, rows.size).all { it.code < currentChar.code }
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|| (0 until currentIndexRow).map { rows[it][currentIndexCol] }.all { it.code < currentChar.code }
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|| (currentIndexRow + 1 until rows.size).map { rows[it][currentIndexCol] }.all { it.code < currentChar.code })
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fun part1(rows: List<String>): Int {
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val visibleTreesInside = rows.subList(1, rows.size - 1)
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.withIndex()
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.sumOf { (indexRow, row) ->
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row.subSequence(1, row.length - 1)
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.withIndex()
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.count { (indexCol, currentChar) ->
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isVisible(currentChar, rows, indexCol + 1, indexRow + 1)
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}
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}
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return visibleTreesInside + rows.size * 2 + rows[0].length * 2 - 4
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}
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fun List<Char>.countVisibleTree(currentChar: Char): Int {
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val count = this.takeWhile { it.code < currentChar.code }.count()
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return if (count < this.size) count + 1 else count
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}
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fun calculateVisibility(currentChar: Char, rows: List<String>, currentIndexCol: Int, currentIndexRow: Int): Int {
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val left = rows[currentIndexRow].subSequence(0, currentIndexCol).reversed().toList().countVisibleTree(currentChar)
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val right = rows[currentIndexRow].subSequence(currentIndexCol + 1, rows.size).toList().countVisibleTree(currentChar)
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val up = (0 until currentIndexRow).map { rows[it][currentIndexCol] }.reversed().countVisibleTree(currentChar)
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val down = (currentIndexRow + 1 until rows.size).map { rows[it][currentIndexCol] }.countVisibleTree(currentChar)
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return up * left * right * down
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}
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fun part2(rows: List<String>): Int {
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return rows.subList(1, rows.size - 1)
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.withIndex()
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.maxOf { (indexRow, row) ->
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row.subSequence(1, row.length - 1)
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.withIndex()
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.maxOf { (indexCol, currentChar) ->
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calculateVisibility(currentChar, rows, indexCol + 1, indexRow + 1)
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}
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}
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}
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val testInput = readInput("Day08_test")
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check(part1(testInput) == 21)
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check(part2(testInput) == 8)
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val input = readInput("Day08")
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println(part1(input))
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println(part2(input))
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}
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‎2022/src/main/resources/Day08.txt

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‎2022/src/main/resources/Day08_test.txt

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35390

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