Solution.cs

using System.Linq;
using System.Collections.Generic;

namespace AdventOfCode.Solutions.Year2019.Day07;

class Solution : SolutionBase
{

    IntcodeComputer Amplifier;

    public Solution() : base(7, 2019, "Amplification Circuit")
    {
        Amplifier = new IntcodeComputer(Input.ToIntArray(","));
    }

    protected override string SolvePartOne()
    {
        int highest = 0;
        foreach(var signal in Enumerable.Range(0, 5).Permutations())
        {
            int output = 0;
            foreach(int i in signal.ToArray())
            {
                output = (int)Amplifier.Initialize().WriteInput(i, output).Run().Output.First();
            }
            if(output > highest) highest = output;
        }
        return highest.ToString();
    }

    protected override string SolvePartTwo()
    {
        int highest = 0;
        foreach(var signal in Enumerable.Range(5, 5).Permutations())
        {
            var Amplifiers = new Queue<IntcodeComputer<int>>();
            for(int i = 0; i < 5; i++)
            {
                Amplifiers.Enqueue(
                    new IntcodeComputer(Input.ToIntArray(",")).WriteInput(signal.ToArray()[i])
                );
            }

            int output = 0;
            while(Amplifiers.Count > 0)
            {
                var Amp = Amplifiers.Dequeue();
                Amp.Input.Enqueue(output);
                if(Amp.Run().Paused)
                {
                    Amplifiers.Enqueue(Amp);
                }
                output = (int)Amp.Output.Dequeue();
            }

            if(output > highest) highest = output;
        }
        return highest.ToString();
    }
}