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Day18.kts
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Day18.kts
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import java.io.File
import java.util.*
// input processing
val inputs = File("inputs/day18.txt").readLines()
val row = inputs.count()
val col = inputs[0].length
var map = Array(row + 2, { CharArray(col + 2) })
for (i in 0 until row)
for (j in 0 until col)
map[i+1][j+1] = inputs[i][j]
var nextMap = Array(row + 2, { CharArray(col + 2) })
printMap(0)
for (round in 1..10) {
changed = false
for (i in 0 until row)
for (j in 0 until col)
evolve(i+1, j+1)
map = nextMap
nextMap = Array(row + 2, { CharArray(col + 2) })
}
val wood = map.fold(0) { acc, chars -> acc + chars.filter { it == '|' }.count() }
val lumber = map.fold(0) { acc, chars -> acc + chars.filter { it == '#' }.count() }
println(wood * lumber)
fun evolve(i: Int, j: Int) {
val c = map[i][j]
when (c) {
'.' -> {
if (count(i, j, '|') >= 3) nextMap[i][j] = '|'
else nextMap[i][j] = '.'
}
'|' -> {
if (count(i, j, '#') >= 3) nextMap[i][j] = '#'
else nextMap[i][j] = '|'
}
else -> {
if (count(i, j, '#') >= 1 && count(i, j, '|') >= 1) nextMap[i][j] = '#'
else nextMap[i][j] = '.'
}
}
}
fun count(i: Int, j: Int, c: Char): Int {
var ans = 0
val rowDir = intArrayOf(-1, -1, -1, 0, 0, 1, 1, 1)
val colDir = intArrayOf(-1, 0, 1, -1, 1, -1, 0, 1)
for (k in 0 until rowDir.count()) {
if (map[i + rowDir[k]][j + colDir[k]] == c) ans++
}
return ans
}
fun printMap(round: Int) {
println("================== Round $round ================== ")
for (i in 0 until row) {
for (j in 0 until col)
print(map[i + 1][j + 1])
println()
}
}