import platform.posix.*
import kotlin.math.*

typealias Universe = List<String>

const val initial = """
	.#................................................
	..#...............................................
	###........................................#......
	...........................................#......
	...........................................#......
	..................................................
	..................................................
	..................................................
	..................................................
	..................................................
	..................................................
	..................................................
	..................................................
	..................................................
	..................................................
	..................................................
	..................................................
"""


fun main2() {
	var universe = initial.trimIndent().lines()

	while (true) {
		universe.print()
		universe = universe.computeNextGeneration()
		usleep(200_000)
	}
}


fun Universe.print() = println(joinToString("\n"))


fun Universe.computeNextGeneration() =
	mapIndexed { y, row ->
		val vicinityY = max(y - 1, 0)..min(y + 1, lastIndex)
		row.mapIndexed { x, cell ->
			val vicinityX = max(x - 1, 0)..min(x + 1, row.lastIndex)
			val neighbours = vicinityY.sumBy { neighbourY ->
				vicinityX.count { neighbourX -> this[neighbourY][neighbourX] == '#' }
			}.let {
				if (cell == '#') it - 1
				else it
			}

			when (neighbours) {
				3 -> '#'
				2 -> cell
				else -> '.'
			}
		}.joinToString("")
	}