2018 Day11 Part1 Solved

Data/2018_11.txt

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+5093

Solutions/2018/Day11.cs

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+namespace AdventOfCode.Solutions._2018;
+
+/// <summary>
+/// Day 11: Chronal Charge
+/// https://adventofcode.com/2018/day/11
+/// </summary>
+[Description("Chronal Charge")]
+public sealed partial class Day11 {
+
+	public static string Part1(string[] input, params object[]? _) => Solution1(input).ToString();
+	public static string Part2(string[] input, params object[]? _) => Solution2(input).ToString();
+
+	private static string Solution1(string[] input) {
+		int gridSerialNo = input[0].AsInt();
+
+		int[,] fuelCells = new int[300, 300];
+		foreach ((int cellX, int cellY) in fuelCells.Walk2dArray()) {
+			int value = CalculatePowerValue(gridSerialNo, cellX + 1, cellY + 1);
+			fuelCells[cellX, cellY] = value;
+		}
+
+		int maxValue = int.MinValue;
+		string topLeft = "";
+		foreach (Cell<int> fuelCell in fuelCells.Walk2dArrayWithValues()) {
+			if (fuelCell.X < 298 && fuelCell.Y < 298) {
+				int value = fuelCell.Value
+					+ fuelCells[fuelCell.X + 1, fuelCell.Y]
+					+ fuelCells[fuelCell.X + 2, fuelCell.Y]
+					+ fuelCells[fuelCell.X + 0, fuelCell.Y + 1]
+					+ fuelCells[fuelCell.X + 1, fuelCell.Y + 1]
+					+ fuelCells[fuelCell.X + 2, fuelCell.Y + 1]
+					+ fuelCells[fuelCell.X + 0, fuelCell.Y + 2]
+					+ fuelCells[fuelCell.X + 1, fuelCell.Y + 2]
+					+ fuelCells[fuelCell.X + 2, fuelCell.Y + 2];
+				if (value > maxValue) {
+					maxValue = value;
+					topLeft = $"{fuelCell.X + 1},{fuelCell.Y + 1}";
+				}
+			}
+		}
+
+		return topLeft;
+	}
+
+	private static string Solution2(string[] input)
+	{
+		return "** Solution not written yet **";
+	}
+
+	public static int CalculatePowerValue(int gridSerialNo, int x, int y)
+	{
+		int rackId = x + 10;
+		int value = rackId * y;
+		value += gridSerialNo;
+		value *= rackId;
+		value = value switch
+		{
+			>= 100 => $"{value}"[^3] - '0',
+			_ => 0,
+		};
+		value -= 5;
+		return value;
+	}
+}

Tests/2018/Tests_11.cs

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+using static AdventOfCode.Solutions._2018.Day11;
+
+namespace AdventOfCode.Tests.Year2018;
+
+public class Tests_11_Chronal_Charge
+{
+	const int DAY = 11;
+
+	[Theory]
+	[InlineData("18", 33, 45)]
+	[InlineData("42", 21, 61)]
+	public void Part1(string input, int expectedX, int expectedY)
+	{
+		string actual = SolutionRouter.SolveProblem(YEAR, DAY, PART1, input);
+		string expected = $"{expectedX},{expectedY}";
+		Assert.Equal(expected, actual);
+	}
+
+	[Theory]
+	[InlineData(8, 3, 5, 4)]
+	[InlineData(57, 122, 79, -5)]
+	[InlineData(39, 217, 196, 0)]
+	[InlineData(71, 101, 153, 4)]
+	public void FuelCellP0werLevel(int gridSerialNo, int x, int y, int expected)
+	{
+		int actual = CalculatePowerValue(gridSerialNo, x, y);
+		Assert.Equal(expected, actual);
+	}
+
+	//[Theory]
+	//[InlineData(21, 61)]
+	//public void Part2(string input, int expected)
+	//{
+	//	_ = int.TryParse(SolutionRouter.SolveProblem(YEAR, DAY, PART2, input, 32), out int actual);
+	//	Assert.Equal(expected, actual);
+	//}
+}