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2019/Scala/day07/Day07.scala

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+package day07
+
+import day07.intcode.Solver
+
+class Day07(original: Array[Int])
+{
+  val phases: List[Array[Int]] = Array(0, 1, 2, 3, 4).permutations.toList
+  def solveP1(): (Int, List[Int]) =
+  {
+    val solver = new Solver(original)
+    phases.map(seq => (solver.solveSequenceSingleRun(seq), seq.toList)).maxBy(_._1)
+  }
+
+  val phases2: List[Array[Int]] = Array(5, 6, 7, 8, 9).permutations.toList
+  def solveP2(): (Int, List[Int]) =
+  {
+    val solver = new Solver(original)
+    phases2.map(seq => (solver.solveSequenceMultiRun(seq), seq.toList)).maxBy(_._1)
+  }
+
+}

2019/Scala/day07/Main.scala

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+package day07
+
+import kamlib.{Reader, Wrapper}
+
+object Main {
+
+  def main(args: Array[String]): Unit =
+  {
+    val input: Array[Int] = Reader.readString("/input7.txt").split("[^\\d-]+").map(x => x.toInt)
+    val solution: Day07 = new Day07(input)
+
+    println("Part 1:")
+    Wrapper(solution.solveP1()).print()
+    println("Part 2:")
+    Wrapper(solution.solveP2()).print()
+  }
+}

2019/Scala/day07/intcode/Amplifier.scala

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+package day07.intcode
+
+import day07.intcode.opcode.{Action, Input, Jump, OpCode99, Output}
+
+class Amplifier(input: Array[Int])
+{
+  private[this] val original = input.clone()
+  private[this] var software = input.clone()
+
+  private[this] var pointer = 0
+  private[this] var halted = false
+
+  def isHalted: Boolean = halted
+
+  def reset(): Amplifier = {
+    software = original.clone()
+    halted = false
+    pointer = 0
+    this
+  }
+
+  def runUntilIO(): Amplifier =
+  {
+    val tuple = OpCode99.parseInt(software(pointer));
+    tuple match
+    {
+      case (_, _, _, OpCode99) =>
+        halted = true
+        this
+      case (_, _, m1, outputInstr: Output) => this
+      case (_, _, m1, inputInstr: Input) => this
+      case (m3, m2, m1, instruction: Jump) =>
+        val (bool, jmpPtr) = instruction.checkConditionAndJump(software, software(pointer+1), software(pointer+2), software(pointer+3), m1, m2, m3)
+        if (bool) pointer = jmpPtr
+        else pointer += instruction.length
+        runUntilIO()
+      case (m3, m2, m1, instruction: Action) =>
+        instruction.exec(software, software(pointer+1), software(pointer+2), software(pointer+3), m1, m2, m3)
+        pointer += instruction.length
+        runUntilIO()
+      case _ => throw new Exception("Something went wrong")
+    }
+  }
+
+  def runInput(input: Int): Amplifier =
+  {
+    val tuple = OpCode99.parseInt(software(pointer))
+    tuple match
+    {
+      case (_, _, _, OpCode99) => this
+      case (_, _, m1, inputInstr: Input) =>
+        inputInstr.input(software, software(pointer+1), m1, input)
+        pointer += inputInstr.length
+      case _ => throw new Exception("Unexpected instruction")
+    }
+    this
+  }
+
+  def runOutput(): Int =
+  {
+    val tuple = OpCode99.parseInt(software(pointer))
+    tuple match
+    {
+      case (_, _, _, OpCode99) => 0
+      case (_, _, m1, outputInstr: Output) =>
+        val out = outputInstr.output(software, software(pointer+1), m1)
+        pointer += outputInstr.length
+        out
+      case _ => throw new Exception("Unexpected instruction")
+    }
+  }
+}

2019/Scala/day07/intcode/Solver.scala

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+package day07.intcode
+
+class Solver(software: Array[Int])
+{
+  val amps: Array[Amplifier] = Array(new Amplifier(software), new Amplifier(software), new Amplifier(software), new Amplifier(software), new Amplifier(software))
+
+  def reset(): Unit =
+    amps.foreach(_.reset())
+
+  def setupPhases(phases: Array[Int]): Unit =
+  {
+    amps.foreach(_.runUntilIO())
+    amps(0).runInput(phases(0))
+    amps(1).runInput(phases(1))
+    amps(2).runInput(phases(2))
+    amps(3).runInput(phases(3))
+    amps(4).runInput(phases(4))
+  }
+
+  def solveSequence(lastOutput: Int = 0): Int =
+  {
+    val res0 = amps(0).runUntilIO().runInput(lastOutput).runUntilIO().runOutput()
+    val res1 = amps(1).runUntilIO().runInput(res0).runUntilIO().runOutput()
+    val res2 = amps(2).runUntilIO().runInput(res1).runUntilIO().runOutput()
+    val res3 = amps(3).runUntilIO().runInput(res2).runUntilIO().runOutput()
+    val res4 = amps(4).runUntilIO().runInput(res3).runUntilIO().runOutput()
+    res4
+  }
+
+  def solveSequenceSingleRun(phases: Array[Int]): Int =
+  {
+    reset()
+    setupPhases(phases)
+    solveSequence()
+  }
+
+  @scala.annotation.tailrec
+  final def solveSequenceFeedback(lastOutput: Int = 0): Int =
+  {
+    val res0 = amps(0).runUntilIO().runInput(lastOutput).runUntilIO().runOutput()
+    val res1 = amps(1).runUntilIO().runInput(res0).runUntilIO().runOutput()
+    val res2 = amps(2).runUntilIO().runInput(res1).runUntilIO().runOutput()
+    val res3 = amps(3).runUntilIO().runInput(res2).runUntilIO().runOutput()
+    val res4 = amps(4).runUntilIO().runInput(res3).runUntilIO().runOutput()
+    if (amps.foldLeft(false) {(bool, amp) => bool || amp.isHalted}) lastOutput
+    else solveSequenceFeedback(res4)
+  }
+
+  def solveSequenceMultiRun(phases: Array[Int]): Int =
+  {
+    reset()
+    setupPhases(phases)
+    solveSequenceFeedback()
+  }
+
+}

2019/Scala/day07/intcode/opcode/Action.scala

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+package day07.intcode.opcode
+
+trait Action extends OpCode
+{
+  /** Executes instruction for given parameters and modes */
+  def exec(tape: Array[Int], param1: Int, param2: Int, param3: Int, mode1: Int, mode2: Int, mode3: Int)
+}

2019/Scala/day07/intcode/opcode/Input.scala

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+package day07.intcode.opcode
+
+trait Input extends OpCode
+{
+  /** Executes instruction for given parameters and modes */
+  def input(tape: Array[Int], param1: Int, mode1: Int, input: Int): Unit
+}

2019/Scala/day07/intcode/opcode/Jump.scala

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+package day07.intcode.opcode
+
+trait Jump extends OpCode
+{
+  /** Checks if the condition for jumping is fulfilled, returns boolean and jump pointer */
+  def checkConditionAndJump(tape: Array[Int], param1: Int, param2: Int, param3: Int, mode1: Int, mode2: Int, mode3: Int): (Boolean, Int)
+}
+

2019/Scala/day07/intcode/opcode/OpCode.scala

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+package day07.intcode.opcode
+
+trait OpCode
+{
+  /** length of an instruction */
+  val length: Int
+
+  /** Parse int to full OpCode */
+  def parseInt(code: Int): (Int, Int, Int, OpCode) = // Dunno how to make this static lmao
+  {
+    val opCodeInt: Int = code % 100 // Instruction Code
+    val modeStr = code.toString.substring(0, {if (code.toString.length > 1) code.toString.length - 2 else 0})
+    val modes = "000".substring(modeStr.length) + modeStr
+    (modes(0).asDigit, modes(1).asDigit, modes(2).asDigit, opCodeInt) match
+    {
+      case (a, b, c, 1) => (a, b, c, OpCode1)
+      case (a, b, c, 2) => (a, b, c, OpCode2)
+      case (a, b, c, 3) => (a, b, c, OpCode3)
+      case (a, b, c, 4) => (a, b, c, OpCode4)
+      case (a, b, c, 5) => (a, b, c, OpCode5)
+      case (a, b, c, 6) => (a, b, c, OpCode6)
+      case (a, b, c, 7) => (a, b, c, OpCode7)
+      case (a, b, c, 8) => (a, b, c, OpCode8)
+      case (_, _, _, 99) => (0, 0, 0, OpCode99)
+      case c => throw new Exception("Wrong instruction code " + c)
+    }
+  }
+
+  /** Returns correct value, immediate or positional */
+  protected[this] def accessor(param: Int, mode: Int, tape: Array[Int]): Int =
+  {
+    mode match
+    {
+      case 0 => /* println("Reading "+tape(param)+" from array("+param+")");*/ tape(param)
+      case 1 => /*println("Reading "+param+" immediate");*/ param
+      case p => throw new Exception("HCF: wrong accessor parameter " + p)
+    }
+  }
+
+  /** Writes to the tape in a manner specified by the mode */
+  protected[this] def writer(param: Int, mode: Int, tape: Array[Int], value: Int): Unit =
+  {
+    mode match
+    {
+      case 0 => tape(param) = value//; println("Writing "+value+" to array("+param+")")
+      case 1 => throw new Exception("HCF: unimplemented writer parameter 1")
+      case p => throw new Exception("HCF: wrong writer parameter " + p)
+    }
+  }
+}

2019/Scala/day07/intcode/opcode/OpCode1.scala

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+package day07.intcode.opcode
+
+/** Sum */
+case object OpCode1 extends Action
+{
+  /** length of an instruction */
+  override val length: Int = 4
+
+  /** Executes instruction for given parameters and modes */
+  override def exec(tape: Array[Int], param1: Int, param2: Int, param3: Int, mode1: Int, mode2: Int, mode3: Int): Unit =
+  {
+    val result = accessor(param1, mode1, tape) + accessor(param2, mode2, tape)
+    writer(param3, 0, tape, result) // Write mode is 0 default for now
+  }
+}

2019/Scala/day07/intcode/opcode/OpCode2.scala

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+package day07.intcode.opcode
+
+/** Multiplication */
+case object OpCode2 extends Action
+{
+  /** length of an instruction */
+  override val length: Int = 4
+
+  /** Executes instruction for given parameters and modes */
+  override def exec(tape: Array[Int], param1: Int, param2: Int, param3: Int, mode1: Int, mode2: Int, mode3: Int): Unit =
+  {
+    val result = accessor(param1, mode1, tape) * accessor(param2, mode2, tape)
+    writer(param3, 0, tape, result) // Write mode is 0 default for now
+  }
+}

2019/Scala/day07/intcode/opcode/OpCode3.scala

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+package day07.intcode.opcode
+
+/** Input */
+case object OpCode3 extends Input
+{
+  /** length of an instruction */
+  override val length: Int = 2
+
+  /** Executes instruction for given parameters and modes */
+  override def input(tape: Array[Int], param1: Int, mode1: Int, input: Int): Unit =
+  {
+    //println(s"<< input: $input")
+    writer(param1, 0, tape, input)
+  }
+}

2019/Scala/day07/intcode/opcode/OpCode4.scala

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+package day07.intcode.opcode
+
+/** Output */
+case object OpCode4 extends Output
+{
+  /** length of an instruction */
+  override val length: Int = 2
+
+  /** Executes instruction for given parameters and modes */
+  override def output(tape: Array[Int], param1: Int, mode1: Int): Int =
+  {
+    accessor(param1, mode1, tape)
+  }
+}

2019/Scala/day07/intcode/opcode/OpCode5.scala

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+package day07.intcode.opcode
+
+case object OpCode5 extends Jump
+{
+  /** length of an instruction */
+  override val length: Int = 3
+
+  /** Executes instruction for given parameters and modes */
+  override def checkConditionAndJump(tape: Array[Int], param1: Int, param2: Int, param3: Int, mode1: Int, mode2: Int, mode3: Int): (Boolean, Int) =
+  {
+    if (accessor(param1, mode1, tape) != 0) (true, accessor(param2, mode2, tape))
+    else (false, 0)
+  }
+}

2019/Scala/day07/intcode/opcode/OpCode6.scala

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+package day07.intcode.opcode
+
+case object OpCode6 extends Jump
+{
+  /** length of an instruction */
+  override val length: Int = 3
+
+  /** Executes instruction for given parameters and modes */
+  override def checkConditionAndJump(tape: Array[Int], param1: Int, param2: Int, param3: Int, mode1: Int, mode2: Int, mode3: Int): (Boolean, Int) =
+  {
+    if (accessor(param1, mode1, tape) == 0) (true, accessor(param2, mode2, tape))
+    else (false, 0)
+  }
+}

2019/Scala/day07/intcode/opcode/OpCode7.scala

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+package day07.intcode.opcode
+
+case object OpCode7 extends Action
+{
+  /** length of an instruction */
+  override val length: Int = 4
+
+  /** Executes instruction for given parameters and modes */
+  override def exec(tape: Array[Int], param1: Int, param2: Int, param3: Int, mode1: Int, mode2: Int, mode3: Int): Unit =
+  {
+    if (accessor(param1, mode1, tape) < accessor(param2, mode2, tape))
+      writer(param3, 0, tape, 1)
+    else
+      writer(param3, 0, tape, 0)
+  }
+}

2019/Scala/day07/intcode/opcode/OpCode8.scala

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+package day07.intcode.opcode
+
+case object OpCode8 extends Action
+{
+  /** length of an instruction */
+  override val length: Int = 4
+
+  /** Executes instruction for given parameters and modes */
+  override def exec(tape: Array[Int], param1: Int, param2: Int, param3: Int, mode1: Int, mode2: Int, mode3: Int): Unit =
+  {
+    if (accessor(param1, mode1, tape) == accessor(param2, mode2, tape))
+      writer(param3, 0, tape, 1)
+    else
+      writer(param3, 0, tape, 0)
+  }
+}

2019/Scala/day07/intcode/opcode/OpCode99.scala

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+package day07.intcode.opcode
+
+case object OpCode99 extends OpCode {
+  /** length of an instruction */
+  override val length: Int = 1
+}

2019/Scala/day07/intcode/opcode/Output.scala

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+package day07.intcode.opcode
+
+trait Output extends OpCode
+{
+  /** Executes instruction for given parameters and modes */
+  def output(tape: Array[Int], param1: Int, mode1: Int): Int
+}