Day21.java

package com.sbaars.adventofcode.year19.days;

import com.sbaars.adventofcode.year19.Day2019;
import com.sbaars.adventofcode.year19.intcode.IntcodeComputer;

public class Day21 extends Day2019 {

  public Day21() {
    super(21);
  }

  public static void main(String[] args) {
    new Day21().printParts();
  }

  @Override
  public Object part1() {
    IntcodeComputer ic = new IntcodeComputer(21);
    // !(A && B && C) && D
    ic.setInput("OR A T\n" +
        "AND B T\n" +
        "AND C T\n" +
        "NOT T T\n" +  //flip T
        "AND D T\n" +
        "OR T J\n" +
        "WALK\n");
    long res;
    while ((res = ic.run()) != IntcodeComputer.STOP_CODE)
      if (res > 255) return res;
    return 0;
  }

  @Override
  public Object part2() {
    IntcodeComputer ic = new IntcodeComputer(21);
    // (((!B && H) || !A) || (!C && H)) && D
    ic.setInput("NOT A J\n" +
        "NOT B T\n" +
        "AND H T\n" +
        "OR T J\n" +
        "NOT C T\n" +
        "AND H T\n" +
        "OR T J\n" +
        "AND D J\n" +
        "RUN\n");
    long res;
    while ((res = ic.run()) != IntcodeComputer.STOP_CODE)
      if (res > 255) return res;
    return 0;
  }
}