static void Main()
{
int[] program = File.ReadAllText("input.txt")
.Split(',')
.Select(int.Parse)
.ToArray();
int a = 12, b = 2;
SetInputs(program, a, b);
var comp = new IntComp(program);
var exit = comp.Start();
if (exit != ExitCode.Halt)
{
Console.WriteLine("WARN: Computer did not halt!");
}
int output = GetOutput(comp.MemDump());
PrintResults(a, b, output);
output = 19690720;
(int, int)? inputs = FindInputs(comp, output);
if (inputs != null)
{
(a, b) = inputs.Value;
PrintResults(a, b, output);
Console.WriteLine($"100 * {a} + {b} = {100 * a + b}");
}
else
{
Console.WriteLine($"Inputs for {output} not found!");
}
}
static (int, int)? FindInputs(IntComp comp, int target)
{
var program = comp.Program;
for (int a = 0; a < MaxInput; a++)
{
for (int b = 0; b < MaxInput; b++)
{
SetInputs(program, a, b);
comp.Program = program;
var exit = comp.Start();
int output = GetOutput(comp.MemDump());
if (output == target)
{
return(a, b);
}
}
}
return(null);
}