39 lines
1.0 KiB
Scala
39 lines
1.0 KiB
Scala
package aoc.y2019
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import aoc.Day
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import aoc.y2019.intcode.{Machine, Step}
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import cats._
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import cats.implicits._
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import cats.data.State
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object Day02 extends Day {
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def initialReplacement(noun: Int, verb: Int): Step = Machine.set(1, noun) *> Machine.set(2, verb)
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def runMachine(memory: Vector[BigInt], noun: Int, verb: Int): BigInt = {
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val initialState = Machine(memory)
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val runMachine = for {
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_ <- initialReplacement(noun, verb)
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ran <- Machine.run()
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} yield ran
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val endState = runMachine.runS(initialState).value
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endState.memory(0)
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}
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override def part1(input: String): String = {
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val memory = input.split(",").map(BigInt(_)).toVector
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runMachine(memory, 12, 2).toString
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}
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override def part2(input: String): String = {
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val memory = input.split(",").map(BigInt(_)).toVector
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val magic = 19690720
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val solutions = for {
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noun <- 0 to 99
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verb <- 0 to 99 if runMachine(memory, noun, verb) == magic
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} yield noun * 100 + verb
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solutions.head.toString
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}
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}
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