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Cleared day 3

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Rob Stoffelen 2023-12-12 10:10:55 +01:00
parent 2fa4a61525
commit 154ab4a0ca
1 changed files with 20 additions and 19 deletions
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39
AdventOfCode.Solutions/2023/Day 03/Day03.cs
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@ -1,6 +1,5 @@
using AdventOfCode.Core; using AdventOfCode.Core;
using AdventOfCode.Core.Shared.Grid; using AdventOfCode.Core.Shared.Grid;
using System.Linq;
using System.Text.RegularExpressions; using System.Text.RegularExpressions;
namespace AdventOfCode.Solutions._2023 namespace AdventOfCode.Solutions._2023
@ -26,21 +25,27 @@ namespace AdventOfCode.Solutions._2023
public async Task<string> GetSolutionPart1() public async Task<string> GetSolutionPart1()
{ {
List<PartNumber> parts = []; var (Numbers, Symbols) = await GetNumbersAndSymbols();
int row = 0; return Numbers
await foreach (string line in _inputReader.ReadAsStringLine()) .Where(number => Symbols.Any(s => number.Intersect(s)))
{ .Select(num => int.Parse(num.Value))
row++; .Sum()
MatchCollection matchCollection = FindPartItems().Matches(line); .ToString();
parts.AddRange(matchCollection.Select(match => new PartNumber { X = match.Index + 1, Y = row, Section = match.Value }));
}
List<Rectangle> numbers = parts.Where(p => p.IsDigit()).Select(number => new Rectangle(new Point(number.X - 1, number.Y - 1), new Point(number.X + number.Length, number.Y + 1), number.Section)).ToList();
List<Point> symbols = parts.Where(p => p.IsPartSymbol()).Select(symbol => new Point(symbol.X, symbol.Y, symbol.Section)).ToList();
return numbers.Where(number => symbols.Any(s => number.Intersect(s))).Select(num => int.Parse(num.Value)).Sum().ToString();
} }
public async Task<string> GetSolutionPart2() public async Task<string> GetSolutionPart2()
{
var (Numbers, Symbols) = await GetNumbersAndSymbols();
return Symbols
.Where(s => s.Value == "*")
.Select(g => Numbers.Where(n => n.Intersect(g)))
.Where(n => n.Count() == 2)
.Select(num => int.Parse(num.First().Value) * int.Parse(num.Last().Value))
.Sum()
.ToString();
}
private async Task<(List<Rectangle> Numbers, List<Point> Symbols)> GetNumbersAndSymbols()
{ {
List<PartNumber> parts = []; List<PartNumber> parts = [];
int row = 0; int row = 0;
@ -52,13 +57,9 @@ namespace AdventOfCode.Solutions._2023
} }
List<Rectangle> numbers = parts.Where(p => p.IsDigit()).Select(number => new Rectangle(new Point(number.X - 1, number.Y - 1), new Point(number.X + number.Length, number.Y + 1), number.Section)).ToList(); List<Rectangle> numbers = parts.Where(p => p.IsDigit()).Select(number => new Rectangle(new Point(number.X - 1, number.Y - 1), new Point(number.X + number.Length, number.Y + 1), number.Section)).ToList();
List<Point> gears = parts.Where(p => p.IsPartSymbol() && p.Section == "*").Select(symbol => new Point(symbol.X, symbol.Y, symbol.Section)).ToList(); List<Point> symbols = parts.Where(p => p.IsPartSymbol()).Select(symbol => new Point(symbol.X, symbol.Y, symbol.Section)).ToList();
return gears.Select(g => numbers.Where(n => n.Intersect(g))) return (numbers, symbols);
.Where(n => n.Count() == 2)
.Select(num => int.Parse(num.First().Value) * int.Parse(num.Last().Value))
.Sum()
.ToString();
} }
[GeneratedRegex("(\\d+)", RegexOptions.Compiled)] [GeneratedRegex("(\\d+)", RegexOptions.Compiled)]