benharri.org
my advent of code solutions
1namespace Solutions._2019;
2
3/// <summary>
4/// Day 13: <a href="https://adventofcode.com/2019/day/13"/>
5/// </summary>
6public sealed class Day13CarePackage() : Day(2019, 13, "Care Package")
7{
8 private IntCodeVM? _vm;
9 private readonly Dictionary<(long x, long y), long> _board = [];
10 private readonly List<(long x, long y)> _updatedCoordinates = [];
11
12 public override void ProcessInput() =>
13 _vm = new(Input.First());
14
15 private void PrintBoard()
16 {
17 var coords = _updatedCoordinates.Count != 0 ? _updatedCoordinates : _board.Keys.ToList();
18 foreach (var (x, y) in coords)
19 {
20 if (x < 0 || y < 0) continue;
21 Console.SetCursorPosition((int)x, (int)y);
22 var value = _board[(x, y)];
23 Console.Write(value switch
24 {
25 0 => " ",
26 1 => "█",
27 2 => "#",
28 3 => "_",
29 4 => ".",
30 _ => value,
31 });
32 }
33 }
34
35 public override object Part1()
36 {
37 _vm!.Reset();
38 _vm.Run();
39 return _vm.Output.Where((v, i) => (i + 1) % 3 == 0 && v == 2).Count();
40 }
41
42 public override object Part2()
43 {
44 _vm!.Reset();
45 _vm.Memory[0] = 2;
46 var printBoard = false;
47 var gameTicks = 0;
48 if (printBoard)
49 {
50 Console.Clear();
51 Console.CursorVisible = false;
52 }
53
54 var haltType = IntCodeVM.HaltType.Waiting;
55 while (haltType == IntCodeVM.HaltType.Waiting)
56 {
57 haltType = _vm.Run();
58 if (printBoard) _updatedCoordinates.Clear();
59 while (_vm.Output.Count != 0)
60 {
61 long x = _vm.Result, y = _vm.Result;
62 _board[(x, y)] = _vm.Result;
63 if (printBoard) _updatedCoordinates.Add((x, y));
64 }
65
66 if (printBoard) PrintBoard();
67
68 var (ball, _) = _board.Single(t => t.Value == 4).Key;
69 var (paddle, _) = _board.Single(t => t.Value == 3).Key;
70 _vm.AddInput(Math.Sign(ball.CompareTo(paddle)));
71
72 gameTicks++;
73 }
74
75 return $"after {gameTicks} moves, the score is: {_board[(-1, 0)]}";
76 }
77}