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tidy up a bit
continuous-integration/drone/push Build is passing Details

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Ben Harris 2021-12-13 01:38:11 -05:00
parent 5adf034e6e
commit 7273a296be
1 changed files with 12 additions and 19 deletions
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31
aoc2021/Day13.cs
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@ -7,14 +7,14 @@ namespace aoc2021;
/// </summary> /// </summary>
public sealed class Day13 : Day public sealed class Day13 : Day
{ {
private List<(int x, int y)> _grid; private List<(int x, int y)> _dots;
private readonly List<(char axis, int index)> _folds; private readonly List<(char axis, int index)> _folds;
public Day13() : base(13, "Transparent Origami") public Day13() : base(13, "Transparent Origami")
{ {
var s = Input.Split("").ToList(); var s = Input.Split("").ToList();
_grid = s[0].Select(p => _dots = s[0].Select(p =>
{ {
var i = p.Split(',', 2).Select(int.Parse).ToList(); var i = p.Split(',', 2).Select(int.Parse).ToList();
return (i[0], i[1]); return (i[0], i[1]);
@ -34,15 +34,12 @@ public sealed class Day13 : Day
switch (axis) switch (axis)
{ {
case 'x': case 'x':
foreach (var (x, y) in grid) foreach (var (x, y) in grid) result.Add((x > at ? 2 * at - x : x, y));
result.Add((x > at ? 2 * at - x : x, y));
break; break;
case 'y': case 'y':
foreach (var (x, y) in grid) foreach (var (x, y) in grid) result.Add((x, y > at ? 2 * at - y : y));
result.Add((x, y > at ? 2 * at - y : y));
break; break;
default: default: throw new ArgumentException("invalid fold axis", nameof(axis));
throw new ArgumentException("invalid fold axis", nameof(axis));
} }
return result.Distinct().ToList(); return result.Distinct().ToList();
@ -50,14 +47,14 @@ public sealed class Day13 : Day
private string PrintGrid() private string PrintGrid()
{ {
var xMax = _grid.Max(g => g.x); var xMax = _dots.Max(g => g.x);
var yMax = _grid.Max(g => g.y); var yMax = _dots.Max(g => g.y);
var s = new StringBuilder(); var s = new StringBuilder();
for (var y = 0; y <= yMax; y++) for (var y = 0; y <= yMax; y++)
{ {
for (var x = 0; x <= xMax; x++) for (var x = 0; x <= xMax; x++)
s.Append(_grid.Contains((x, y)) ? "█" : "▒"); s.Append(_dots.Contains((x, y)) ? "█" : "▒");
s.AppendLine(); s.AppendLine();
} }
@ -65,18 +62,14 @@ public sealed class Day13 : Day
return s.ToString(); return s.ToString();
} }
public override object Part1() public override object Part1() =>
{ DoFold(_dots, _folds[0].axis, _folds[0].index).Count;
var (axis, at) = _folds[0];
var foldedOnce = DoFold(_grid, axis, at);
return foldedOnce.Count;
}
public override object Part2() public override object Part2()
{ {
foreach (var (axis, at) in _folds) foreach (var (axis, at) in _folds)
_grid = DoFold(_grid, axis, at); _dots = DoFold(_dots, axis, at);
return Environment.NewLine + PrintGrid(); return Environment.NewLine + PrintGrid();
} }
} }