101 lines
2.6 KiB
C#
101 lines
2.6 KiB
C#
namespace AOC2019;
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public sealed class Day11 : Day
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{
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private IntCodeVM? _vm;
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private Direction _heading;
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private long _x, _y;
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public Day11() : base(2019, 11, "Space Police")
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{
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}
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public override void ProcessInput()
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{
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_vm = new(Input.First());
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}
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private void Move()
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{
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switch (_heading)
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{
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case Direction.Up:
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_y++;
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break;
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case Direction.Down:
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_y--;
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break;
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case Direction.Left:
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_x--;
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break;
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case Direction.Right:
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_x++;
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break;
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default:
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throw new ArgumentException("invalid heading", nameof(_heading));
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}
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}
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private void Turn(long direction)
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{
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_heading = _heading switch
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{
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Direction.Up => direction == 0 ? Direction.Left : Direction.Right,
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Direction.Down => direction == 0 ? Direction.Right : Direction.Left,
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Direction.Left => direction == 0 ? Direction.Down : Direction.Up,
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Direction.Right => direction == 0 ? Direction.Up : Direction.Down,
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_ => _heading
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};
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Move();
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}
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private Dictionary<(long x, long y), long> PaintShip(int initialVal)
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{
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var map = new Dictionary<(long, long), long>();
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_vm!.Reset();
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_heading = Direction.Up;
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_x = 0;
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_y = 0;
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map[(_x, _y)] = initialVal;
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var haltType = IntCodeVM.HaltType.Waiting;
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while (haltType == IntCodeVM.HaltType.Waiting)
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{
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haltType = _vm.Run(map.GetValueOrDefault((_x, _y)));
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map[(_x, _y)] = _vm.Result;
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Turn(_vm.Result);
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}
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return map;
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}
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public override object Part1() => PaintShip(0).Count;
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public override object Part2()
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{
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var map = PaintShip(1);
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var minX = (int)map.Keys.Select(i => i.x).Min();
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var maxX = (int)map.Keys.Select(i => i.x).Max();
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var minY = (int)map.Keys.Select(i => i.y).Min();
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var maxY = (int)map.Keys.Select(i => i.y).Max();
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return Enumerable.Range(minY, maxY - minY + 1)
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.Select(j =>
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Enumerable.Range(minX, maxX - minX + 1)
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.Select(i => map.GetValueOrDefault((x: i, y: j)) == 0 ? ' ' : '#')
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.ToDelimitedString()
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)
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.Reverse()
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.ToDelimitedString(Environment.NewLine);
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}
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private enum Direction
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{
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Up,
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Down,
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Left,
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Right
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}
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}
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