public static int SolvePart2(int[] code)
{
var phaseSettings = new int[] { 5, 6, 7, 8, 9 };
int maxOutput = 0;
do
{
var cpus = new IntCodeCPU[5];
int prevOutput = 0;
while (!(cpus[4]?.Halted ?? false))
{
for (int i = 0; i < 5; ++i)
{
cpus[i] ??= new ((int[])code.Clone(), new int[] { phaseSettings[i] });
cpus[i].Inputs.Enqueue(prevOutput);
cpus[i].RunUntilWaitingInput();
prevOutput = cpus[i].Outputs.Last();
}
}
if (maxOutput < prevOutput)
{
maxOutput = prevOutput;
}
} while(NextPermutation(phaseSettings));
return(maxOutput);
}
public static int SolvePart1(int[] code)
{
var phaseSettings = new int[] { 0, 1, 2, 3, 4 };
int maxOutput = 0;
do
{
int prevOutput = 0;
for (int i = 0; i < 5; ++i)
{
int[] localCode = (int[])code.Clone();
var cpu = new IntCodeCPU(localCode, new int[] { phaseSettings[i], prevOutput });
cpu.Run();
prevOutput = cpu.Outputs.Last();
}
if (maxOutput < prevOutput)
{
maxOutput = prevOutput;
}
} while(NextPermutation(phaseSettings));
return(maxOutput);
}
