117 lines
2.4 KiB
C#
117 lines
2.4 KiB
C#
using System.Diagnostics;
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namespace LensLibrary;
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public class Program
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{
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public static async Task<int> Main(string[] args)
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{
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if (args.Length is 0)
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{
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Console.WriteLine("Please provide a path to the input file.");
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return -1;
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}
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if (File.Exists(args[0]) is false)
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{
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Console.WriteLine("The provided file does not exist.");
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return -2;
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}
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var input = await File.ReadAllTextAsync(args[0]);
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var stopwatch = new Stopwatch();
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stopwatch.Start();
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var result = LaunchSequence
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.Parse(input)
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.Steps
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.Sum(step => step.HashLabel());
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stopwatch.Stop();
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Console.WriteLine($"The total is {result}. ({stopwatch.ElapsedMilliseconds}ms)");
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return result;
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}
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}
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public class LaunchSequence(
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List<Step> steps
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)
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{
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public List<Step> Steps { get; init; } = steps;
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public long Initialize()
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{
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var boxes = new Dictionary<int, Dictionary<string, int>>();
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foreach (var num in Enumerable.Range(0, 255))
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{
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boxes.Add(num, []);
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}
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return 0;
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}
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public static LaunchSequence Parse(string input, bool part2 = false)
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{
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var steps = input
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.Split(
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',',
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StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries
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)
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.Select(step => Step.Parse(step, part2))
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.ToList();
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return new LaunchSequence(steps);
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}
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}
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public class Step(
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string label,
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Operation operation,
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int? lensFocalLength
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)
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{
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public string Label { get; init; } = label;
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public Operation Operation { get; init; } = operation;
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public int? LensFocalLength { get; init; } = lensFocalLength;
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public int HashLabel() => Label
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.Aggregate(0, (hash, character) =>
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{
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var ascii = (int)character;
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hash += ascii;
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hash *= 17;
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hash %= 256;
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return hash;
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});
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public static Step Parse(string input, bool part2 = false)
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{
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if (input.Contains('-'))
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{
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var label = part2 ? input.Trim('-') : input;
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return new Step(label, Operation.Removal, null);
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}
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if (input.Contains('='))
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{
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var parts = input.Split('=');
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var label = part2 ? parts[0] : parts[0] + "=" + parts[1];
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var focalLength = int.Parse(parts[1]);
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return new Step(label, Operation.Insertion, focalLength);
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}
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throw new ArgumentException("Invalid input.", nameof(input));
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}
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}
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public enum Operation
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{
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Removal,
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Insertion,
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} |