public static int CalculateResultForPartOne(string[] input)
{
var program = new MyProgram(input);
program.Run();
return(program.Accumulator);
}
public static int CalculateResultForPartTwo(string[] input)
{
var instructionList = input.ToList();
var instructionToAlter = instructionList.FindIndex(i => i.StartsWith("nop") || i.StartsWith("jmp"));
while (instructionToAlter >= 0)
{
AlterInstruction(input, instructionToAlter);
var program = new MyProgram(input);
var programEndedSuccessfully = program.Run();
if (programEndedSuccessfully)
{
return(program.Accumulator);
}
// change altered instruction back
AlterInstruction(input, instructionToAlter);
// alter next nop or jmp instruction
instructionToAlter = instructionList.FindIndex(
++instructionToAlter,
i => i.StartsWith("nop") || i.StartsWith("jmp"));
}
return(int.MinValue);
}