Day 5 2023 Solution

AdventOfCode.Solutions/Helpers/EnumerableHelper.cs

@@ -0,0 +1,14 @@
+namespace AdventOfCode.Solutions.Helpers;
+public static class EnumerableHelper
+{
+	public static IEnumerable<long> LongRange(long start, long length)
+	{
+		var limit = start + length;
+
+		while (start < limit)
+		{
+			yield return start;
+			start++;
+		}
+	}
+}

AdventOfCode.Solutions/_2023/Day5.cs

@@ -0,0 +1,121 @@
+using AdventOfCode.Domain.Interfaces;
+using AdventOfCode.Solutions.Helpers;
+using System.Text.RegularExpressions;
+
+namespace AdventOfCode.Solutions._2023;
+
+public class Day5 : IDay
+{
+	public string Title => "If You Give A Seed A Fertilizer";
+
+	public string PartA(string input)
+	{
+		var inputSections = input.Split("\n\n", StringSplitOptions.RemoveEmptyEntries);
+
+		var seeds = Regex.Match(inputSections[0], @"seeds: ((?:(?:\d+) *)*)", RegexOptions.Compiled)
+			.Groups[1]
+			.Value
+			.Split(' ')
+			.Select(long.Parse);
+
+		var seedToSoilMap = DeserializeInputToMap(inputSections[1]);
+		var soilToFertilizerMap = DeserializeInputToMap(inputSections[2]);
+		var fertilizerToWaterMap = DeserializeInputToMap(inputSections[3]);
+		var waterToLightMap = DeserializeInputToMap(inputSections[4]);
+		var lightToTemperatureMap = DeserializeInputToMap(inputSections[5]);
+		var temperatureToHumidityMap = DeserializeInputToMap(inputSections[6]);
+		var humidityToLocationMap = DeserializeInputToMap(inputSections[7]);
+
+		var smallestLocation = long.MaxValue;
+
+		foreach (var seed in seeds)
+		{
+			long soil = DestinationFromSourceNumber(seedToSoilMap, seed);
+			long fetilizer = DestinationFromSourceNumber(soilToFertilizerMap, soil);
+			long water = DestinationFromSourceNumber(fertilizerToWaterMap, fetilizer);
+			long light = DestinationFromSourceNumber(waterToLightMap, water);
+			long temperature = DestinationFromSourceNumber(lightToTemperatureMap, light);
+			long humidity = DestinationFromSourceNumber(temperatureToHumidityMap, temperature);
+			long location = DestinationFromSourceNumber(humidityToLocationMap, humidity);
+
+			if (location < smallestLocation)
+			{
+				smallestLocation = location;
+			}
+		}
+
+		return smallestLocation.ToString();
+	}
+
+	public string PartB(string input)
+	{
+		var inputSections = input.Split("\n\n", StringSplitOptions.RemoveEmptyEntries);
+
+		var seedRanges = Regex.Match(inputSections[0], @"seeds: ((?:(?:\d+) *)*)", RegexOptions.Compiled)
+			.Groups[1]
+			.Value
+			.Split(' ')
+			.Select(long.Parse);
+
+		var seeds = new List<long>();
+
+		for (int i = 0; i < seedRanges.Count(); i += 2)
+		{
+			seeds.AddRange(EnumerableHelper.LongRange(seedRanges.ElementAt(i), seedRanges.ElementAt(i + 1)));
+		}
+
+		var seedToSoil = DeserializeInputToMap(inputSections[1]);
+		var soilToFertilizer = DeserializeInputToMap(inputSections[2]);
+		var fertilizerToWater = DeserializeInputToMap(inputSections[3]);
+		var waterToLight = DeserializeInputToMap(inputSections[4]);
+		var lightToTemperature = DeserializeInputToMap(inputSections[5]);
+		var temperatureToHumidity = DeserializeInputToMap(inputSections[6]);
+		var humidityToLocation = DeserializeInputToMap(inputSections[7]);
+
+		var smallestLocation = long.MaxValue;
+
+		foreach (var seed in seeds)
+		{
+			long soil = DestinationFromSourceNumber(seedToSoil, seed);
+			long fetilizer = DestinationFromSourceNumber(soilToFertilizer, soil);
+			long water = DestinationFromSourceNumber(fertilizerToWater, fetilizer);
+			long light = DestinationFromSourceNumber(waterToLight, water);
+			long temperature = DestinationFromSourceNumber(lightToTemperature, light);
+			long humidity = DestinationFromSourceNumber(temperatureToHumidity, temperature);
+			long location = DestinationFromSourceNumber(humidityToLocation, humidity);
+
+			if (location < smallestLocation)
+			{
+				smallestLocation = location;
+			}
+		};
+
+		return smallestLocation.ToString();
+	}
+
+	private static long DestinationFromSourceNumber(List<(long, long, long)> sourceToDestinationMap, long source)
+	{
+		foreach ((long destinationRangeStart,
+				 long sourceRangeStart,
+				 long rangeLength) in sourceToDestinationMap
+					.Select(x => (destinationRangeStart: x.Item1, sourceRangeStart: x.Item2, rangeLength: x.Item3))
+					.Where(x => source >= x.sourceRangeStart && source <= x.sourceRangeStart + x.rangeLength))
+		{
+			return source + (destinationRangeStart - sourceRangeStart);
+		}
+
+		return source;
+	}
+
+	private static List<(long, long, long)> DeserializeInputToMap(string input)
+	{
+		var inputMapRegex = @"(?:(\d+) (\d+) (\d+))";
+
+		return Regex.Matches(input, inputMapRegex, RegexOptions.Compiled)
+			.Select(a => (
+				destinationRangeStart: long.Parse(a.Groups[1].Value),
+				sourceRangeStart: long.Parse(a.Groups[2].Value),
+				rangeLength: long.Parse(a.Groups[3].Value)))
+			.ToList();
+	}
+}

README.md

@@ -38,7 +38,7 @@ Feel free to run through the solutions (*Note: Potential Spoilers* :see_no_evil:
 |2020|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|:star2:|||||||
 |2021|:star2:|:star2:|||||||||||||||||||||||
 |2022|||||||||||||||||||||||||
-|2023|:star2:|:star2:|:star2:|:star2:|||||||||||||||||||||
+|2023|:star2:|:star2:|:star2:|:star2:|:star2:||||||||||||||||||||
 
 <!-- GETTING STARTED -->
 ## Getting Started

Tests/AdventOfCode.Solutions.Tests/_2023/Day5Tests.cs

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+namespace AdventOfCode.Solutions.Tests._2023;
+
+public class Day5Tests : DayTests
+{
+	[Test]
+	public async Task PartA()
+	{
+		// Arrange
+		string expected = "26273516";
+
+		// Act
+		var solution = await _solverService.SolveDay(2023, 5);
+
+		// Assert
+		solution.PartA.Solution.Should().Be(expected);
+	}
+
+	[Test]
+	public async Task PartB()
+	{
+		// Arrange
+		string expected = "34039469";
+
+		// Act
+		var solution = await _solverService.SolveDay(2023, 5);
+
+		// Assert
+		solution.PartB.Solution.Should().Be(expected);
+	}
+}