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import java.io.File
import java.math.BigInteger
import java.security.MessageDigest
/**
* Reads lines from the given input txt file.
* @param name name of the file
* @return list of strings containing line contents
*/
fun readInputAsLines(name: String): List<String> = File("src", "$name.txt").readLines()
/**
* Returns a string of contents of the given input txt file.
* @param name name of the file
* @return contents of file as string
*/
fun readInputAsString(name: String): String = File("src", "$name.txt").readText()
/**
* Read lines from the given input txt file and convert them to decimal numbers.
* @param name name of the file
* @return list of ints containing numbers from each of file's lines
*/
fun readInputAsNumbers(name: String): List<Int> = readInputAsLines(name).map(String::toInt)
/**
* Read lines from the given input txt file containing binary numbers and convert them to lists of bits.
* @param name name of the file
* @return list of lists of ints, where each inner list represents bits of one line of input
*/
fun readInputAsBitLists(name: String): List<List<Int>> =
readInputAsLines(name)
.map { binaryString -> binaryString.toList().map { bit -> bit.toString().toInt() } }
data class Pos2D(val x: Int, val y: Int) {
companion object {
val directions4 = listOf(Pos2D(0, 1), Pos2D(1, 0), Pos2D(0, -1), Pos2D(-1, 0))
val directions8 = directions4 + listOf(
Pos2D(1, 1),
Pos2D(1, -1),
Pos2D(-1, -1),
Pos2D(-1, 1),
)
}
operator fun plus(other: Pos2D) = Pos2D(x + other.x, y + other.y)
}
fun parseToMap(input: List<String>): Map<Pos2D, Int> =
input.flatMapIndexed { y, line ->
line.mapIndexed { x, char ->
Pos2D(x, y) to char.toString().toInt()
}
}.toMap()
/**
* Converts string to md5 hash.
* @receiver a string
* @return md5 hash of receiver
*/
fun String.md5(): String = BigInteger(1, MessageDigest.getInstance("MD5").digest(toByteArray())).toString(16)
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