Last active
January 1, 2022 14:53
-
-
Save sungkmi/8f9ed15e8ff98eaa41bfaa78c81c6ea3 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package lascala.aoc2021.day1_10.day3 | |
import javax.tools.Diagnostic | |
case class DiagnosticReport( | |
width: Int, | |
bits: Seq[BigInt], | |
) | |
extension (d: DiagnosticReport) | |
def gammaRate: BigInt = BigInt((0 until d.width).map { i => | |
if d.bits.map(_.testBit(i)).count(_ == true) * 2 > d.bits.size then "1" else "0" | |
}.reverse.mkString, 2) | |
def epsilonRate: BigInt = BigInt((0 until d.width).map { i => | |
if d.bits.map(_.testBit(i)).count(_ == true) * 2 < d.bits.size then "1" else "0" | |
}.reverse.mkString, 2) | |
def powerComsumption: BigInt = | |
gammaRate * epsilonRate | |
def oxygen: BigInt = | |
def loop(index: Int, bits: Seq[BigInt]): BigInt = | |
if bits.size == 1 then bits.head else | |
val countSet = bits.map(_.testBit(index)).count(_ == true) | |
val mostCommon = if countSet * 2 >= bits.size then true else false | |
val nextBits = bits.filter(_.testBit(index) == mostCommon) | |
loop(index - 1, nextBits) | |
loop(d.width - 1, d.bits) | |
def co2: BigInt = | |
def loop(index: Int, bits: Seq[BigInt]): BigInt = | |
if bits.size == 1 then bits.head else | |
val countSet = bits.map(_.testBit(index)).count(_ == true) | |
val leastCommon = if countSet * 2 < bits.size then true else false | |
val nextBits = bits.filter(_.testBit(index) == leastCommon) | |
loop(index - 1, nextBits) | |
loop(d.width - 1, d.bits) | |
def lifeSupporting: BigInt = oxygen * co2 | |
object DiagnosticReport: | |
def parse(s: String): DiagnosticReport = | |
val lines = s.split("\n") | |
DiagnosticReport( | |
width = lines.head.size, | |
bits = lines.map{ line => BigInt(line, 2) } | |
) | |
def solve1(s: String): BigInt = DiagnosticReport.parse(s).powerComsumption | |
def solve2(s: String): BigInt = DiagnosticReport.parse(s).lifeSupporting | |
@main def part1: Unit = | |
val ans = solve1(input) | |
println(ans) | |
@main def part2: Unit = | |
val ans = solve2(input) | |
println(ans) | |
//val input = """111111010011 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package lascala.aoc2021.day1_10.day3 | |
import minitest.SimpleTestSuite | |
import hedgehog.minitest.HedgehogSupport | |
import hedgehog.* | |
object Day3Test extends SimpleTestSuite with HedgehogSupport: | |
val exampleInput: String = """00100 | |
11110 | |
10110 | |
10111 | |
10101 | |
01111 | |
00111 | |
11100 | |
10000 | |
11001 | |
00010 | |
01010""" | |
example("day3 - gammaRate") { | |
val d = DiagnosticReport.parse(exampleInput) | |
d.gammaRate.toString(2) ==== "10110" | |
} | |
example("day3 - epsilonRate") { | |
val d = DiagnosticReport.parse(exampleInput) | |
d.epsilonRate ==== 9 | |
} | |
example("day3 - oxygen") { | |
val d = DiagnosticReport.parse(exampleInput) | |
d.oxygen ==== 23 | |
} | |
example("day3 - co2") { | |
val d = DiagnosticReport.parse(exampleInput) | |
d.co2 ==== 10 | |
} | |
example("day3 - solve1") { | |
solve1(exampleInput) ==== 198 | |
} | |
example("day3 - solve2") { | |
solve2(exampleInput) ==== 230 | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment