protected override long RunPart2()
{
var runner = new ProgramRunner(this.ParsedInput);
try
{
runner.All();
}
catch (ProgramHasInfiniteLoopException)
{
var fixableInstructions = runner.History
.Select(i => ((int index, Instruction instruction))(i, runner.Program[i]))
.Where(kvp => kvp.instruction.Operation == Operations.Jump || kvp.instruction.Operation == Operations.NoOperation)
.ToArray();
for (var i = fixableInstructions.Length - 1; i >= 0; i--)
{
var program = (Instruction[])this.ParsedInput.Clone();
var instructionToFix = fixableInstructions[i];
program[instructionToFix.index] = new Instruction()
{
Argument = instructionToFix.instruction.Argument
};
if (program[instructionToFix.index].Operation == Operations.NoOperation)
{
program[instructionToFix.index].Operation = Operations.Jump;
}
else
{
program[instructionToFix.index].Operation = Operations.NoOperation;
}
try
{
runner = new ProgramRunner(program);
return(runner.All());
}
catch (ProgramHasInfiniteLoopException) { }
}
}
return(0);
}
protected override long RunPart1()
{
var runner = new ProgramRunner(this.ParsedInput);
try
{
runner.All();
}
catch (ProgramHasInfiniteLoopException ex)
{
return(ex.AccumulatorValue);
}
return(0);
}