public static BigInteger GetDay21Part1Answer()
{
// Program the springdroid with logic that allows it to survey the
// hull without falling into space. What amount of hull damage
// does it report?
// Answer: 19360724
BigInteger result = 0;
Console.WriteLine("Starting Day 21 - Part 1...");
var program = GetDay21Input();
var inputProvider = new BufferedInputProvider();
var outputListener = new ListOutputListener();
var computer = new IntcodeComputer(inputProvider, outputListener);
computer.LoadProgram(program);
// Define the robot instructions
// Note - a jump will land 4 spaces ahead
// Jump only if any of A, B, or C are holes
// AND D is not a hole
// ->
// NOT A J <- JUMP is true if A is a hole
// NOT B T <- TEMP is true if B is a hole
// OR T J <- JUMP is true if A or B is a hole
// NOT C T <- TEMP is true if C is a hole
// OR T J <- JUMP is true if A or B or C is a hole
// NOT D T <- TEMP is true if D is a hole
// NOT T T <- TEMP is true if D is *not* a hole
// AND T J <- JUMP is true if (A or B or C is a hole) AND (D is not a hole)
var robotInstructions = new List <string>()
{
"NOT A J",
"NOT B T",
"OR T J",
"NOT C T",
"OR T J",
"NOT D T",
"NOT T T",
"AND T J",
"WALK"
};
var robotInstructionAsciiInput = GetRobotInstructionAsciiInputValues(robotInstructions);
inputProvider.Values.AddRange(robotInstructionAsciiInput);
computer.RunProgram();
// If the robot successfully made it across, then the last output
// value will be a large non-ascii character
if (outputListener.Values.Count > 0 && outputListener.Values.Last() > 255)
{
result = outputListener.Values.Last();
outputListener.Values.RemoveAt(outputListener.Values.Count - 1);
}
IntcodeComputerHelper.DrawAsciiOutput(outputListener.Values);
return(result);
}
public static BigInteger GetDay21Part2Answer()
{
// Successfully survey the rest of the hull by ending your program
// with RUN. What amount of hull damage does the springdroid now
// report?
// Answer: 1140450681
BigInteger result = 0;
Console.WriteLine("Starting Day 21 - Part 2...");
var program = GetDay21Input();
var inputProvider = new BufferedInputProvider();
var outputListener = new ListOutputListener();
var computer = new IntcodeComputer(inputProvider, outputListener);
computer.LoadProgram(program);
// Define the robot instructions
// Note - a jump will still land 4 spaces ahead
// Jump if:
// There is a hole in A, B, or C
// And D is not a hole
// And (H OR (E AND (I OR F)))
// OR A J |\
// AND B J | | A, B, or C is a hole: !(A AND B AND C)
// AND C J | |
// NOT J J |/
// AND D J | AND D is a block
// OR F T |\ (I OR F)
// OR I T |/
// AND E T | E AND (I OR F)
// OR H T | H OR (E AND (I OR F))
// AND T J | final
var robotInstructions = new List <string>()
{
"OR A J ",
"AND B J",
"AND C J",
"NOT J J",
"AND D J",
"OR F T ",
"OR I T ",
"AND E T",
"OR H T ",
"AND T J",
"RUN"
};
var robotInstructionAsciiInput = GetRobotInstructionAsciiInputValues(robotInstructions);
inputProvider.Values.AddRange(robotInstructionAsciiInput);
computer.RunProgram();
// If the robot successfully made it across, then the last output
// value will be a large non-ascii character
if (outputListener.Values.Count > 0 && outputListener.Values.Last() > 255)
{
result = outputListener.Values.Last();
outputListener.Values.RemoveAt(outputListener.Values.Count - 1);
}
IntcodeComputerHelper.DrawAsciiOutput(outputListener.Values);
return(result);
}