/// <summary>
/// Runs the specified Intcode program.
/// </summary>
/// <param name="program">The Intcode program to run.</param>
/// <param name="adjust">Whether to adjust the state for <c>1202 program alarm</c> before running.</param>
/// <param name="cancellationToken">The optional cancellation token to use.</param>
/// <returns>
/// The memory values of the program once run.
/// </returns>
public static async Task <IReadOnlyList <long> > RunProgramAsync(
string program,
bool adjust = false,
CancellationToken cancellationToken = default)
{
long[] instructions = IntcodeVM.ParseProgram(program);
if (adjust)
{
instructions[1] = 12;
instructions[2] = 2;
}
var vm = new IntcodeVM(instructions)
{
Input = await ChannelHelpers.CreateReaderAsync(new[] { 0L }, cancellationToken),
};
if (!await vm.RunAsync(cancellationToken))
{
throw new PuzzleException("Failed to run program.");
}
return(vm.Memory().ToArray());
}
/// <summary>
/// Runs the specified Intcode program as an asynchronous operation.
/// </summary>
/// <param name="program">The Intcode program to run.</param>
/// <param name="input">The input to the program.</param>
/// <param name="cancellationToken">The cancellation token to use.</param>
/// <returns>
/// The output of the program once run.
/// </returns>
internal static async Task <IReadOnlyList <long> > RunAsync(
IEnumerable <long> program,
long[] input,
CancellationToken cancellationToken)
{
var vm = new IntcodeVM(program)
{
Input = await ChannelHelpers.CreateReaderAsync(input, cancellationToken),
};
if (!await vm.RunAsync(cancellationToken))
{
throw new PuzzleException("Failed to run program.");
}
return(await vm.Output.ToListAsync(cancellationToken));
}
/// <summary>
/// Runs the specified Intcode program.
/// </summary>
/// <param name="program">The Intcode program to run.</param>
/// <param name="input">The input to the program.</param>
/// <param name="cancellationToken">The cancellation token to use.</param>
/// <returns>
/// The diagnostic code output by the program.
/// </returns>
public static async Task <long> RunProgramAsync(
string program,
long input,
CancellationToken cancellationToken)
{
long[] instructions = IntcodeVM.ParseProgram(program);
var vm = new IntcodeVM(instructions)
{
Input = await ChannelHelpers.CreateReaderAsync(new[] { input }, cancellationToken),
};
if (!await vm.RunAsync(cancellationToken))
{
throw new PuzzleException("Failed to run program.");
}
var outputs = await vm.Output.ToListAsync(cancellationToken);
return(outputs.Count == 0 ? 0 : outputs[^ 1]);
/// <summary>
/// Runs the specified Intcode program.
/// </summary>
/// <param name="program">The Intcode program to run.</param>
/// <param name="useFeedback">Whether to arrange the amplifiers in a feedback loop.</param>
/// <param name="cancellationToken">The optional cancellation to oken to use.</param>
/// <returns>
/// The diagnostic code output by the program.
/// </returns>
public static async Task <long> RunProgramAsync(
string program,
bool useFeedback = false,
CancellationToken cancellationToken = default)
{
long[] instructions = IntcodeVM.ParseProgram(program);
int[] seed = useFeedback ? new[] { 5, 6, 7, 8, 9 } : new[] { 0, 1, 2, 3, 4 };
var signals = new List <long>();
foreach (var permutation in Maths.GetPermutations(seed))
{
long signal = 0;
long[] phases = permutation.Select((p) => (long)p).ToArray();
if (!useFeedback)
{
for (int i = 0; i < phases.Length; i++)
{
signal = (await IntcodeVM.RunAsync(instructions, new[] { phases[i], signal }, cancellationToken))[0];
}
}
else
{
var amplifiers = new IntcodeVM[phases.Length];
var inputs = new Channel <long> [phases.Length];
for (int i = 0; i < phases.Length; i++)
{
amplifiers[i] = new(instructions);
var input = Channel.CreateUnbounded <long>();
await input.Writer.WriteAsync(phases[i], cancellationToken);
inputs[i] = input;
}
await inputs[0].Writer.WriteAsync(0, cancellationToken);
for (int i = 0; i < phases.Length; i++)
{
int nextAmp = i == phases.Length - 1 ? 0 : i + 1;
var thisAmp = amplifiers[i];
var nextInput = inputs[nextAmp];
thisAmp.Input = inputs[i].Reader;
thisAmp.OnOutput += async(_, value) =>
{
await nextInput.Writer.WriteAsync(value, cancellationToken);
};
}
bool completed = false;
while (!completed)
{
foreach (var amp in amplifiers)
{
completed = await amp.RunAsync(cancellationToken);
}
}
signal = (await amplifiers[^ 1].Output.ToListAsync(cancellationToken))[^ 1];
