My kotlin solutions to Advent of Code puzzles.
To run all days, adjust year, but run with:
./gradlew advent2022
To run tests, the files must be in unix format when checked out of git, so use
git config --global core.eol lf
git config --global core.autocrlf input
# if you had checked it out without setting above first, you need to fix files with CRLF into LF:
git rm -rf --cached .
git reset --hard HEAD- column of data, separator is EOL
Example 2022 02
// simply split into List<String>
resourceLines(2022, 2)
// then can deal with each line
data.fold(0) { acc, l ->
val (a,b) = l.split(" ", limit = 2)
// ... etc- column data with blank line separator
Example, 2022 01
5538
6760
5212
2842
// first a list of strings for each block (which still have \n in them)
private val data by lazy { totals(resourceStrings(2022, 1)) }
// Then split by \n
data.map { block ->
block.split("\n").sumOf { f -> f.toInt() }
}Example where each line contains information we want to extract parts out of
12-80,12-81
13-94,14-93
...
Use resourceLines to pull each line, and then map that through a regex "Extractor"
private val assignmentExtractor by lazy { Regex("""(\d+)-(\d+),(\d+)-(\d+)""") }
private val data by lazy { toAssignments(resourceLines(2022, 4)) }
fun toAssignments(data: List<String>): List<Assignments> = data.map { line ->
assignmentExtractor.find(line)?.destructured!!.let { (a, b, c, d) ->
Assignments(IntRange(a.toInt(), b.toInt()), IntRange(c.toInt(), d.toInt()))
}
}Example 2022 04
See GridDataUtils for parsing grid information from lines where each point represents 1 datum, either as numbers:
1234
2256
1978
or as characters:
.x.
yz.
There are some good examples of looking from a point to a boundary in 2022 Day 08, using generateSequence on points in a direction until they hit the boundary.
private fun pointsToBoundaryInDir(p: Point, dir: Direction): Sequence<Point> {
return generateSequence(p + dir) { it + dir }.takeWhileInclusive { !onBoundary(it) }
}