d10p2

main
Ben Harris 8 months ago
parent cdf3674e4e
commit 682d0545aa
  1. 2
      aoc2021.test/DayTests.cs
  2. 60
      aoc2021/Day10.cs

@ -13,7 +13,7 @@ public class DayTests
[DataRow(typeof(Day07), "345035", "97038163")]
[DataRow(typeof(Day08), "362", "1020159")]
[DataRow(typeof(Day09), "478", "1327014")]
[DataRow(typeof(Day10), "288291", "")]
[DataRow(typeof(Day10), "288291", "820045242")]
public void CheckAllDays(Type dayType, string part1, string part2)
{
var s = Stopwatch.StartNew();

@ -1,17 +1,19 @@
using System.Collections;
namespace aoc2021;
namespace aoc2021;
/// <summary>
/// Day 10: <see href="https://adventofcode.com/2021/day/10"/>
/// </summary>
public sealed class Day10 : Day
{
private readonly List<string> _input;
private readonly char[] _openers = { '(', '[', '{', '<' };
private readonly char[] _closers = { ')', ']', '}', '>' };
private static readonly Dictionary<char, char> MatchedBrackets = new()
{
{'(', ')'},
{'[', ']'},
{'{', '}'},
{'<', '>'}
};
private readonly Dictionary<char, int> _scores = new()
private static readonly Dictionary<char, long> Scores = new()
{
{ ')', 3 },
{ ']', 57 },
@ -19,45 +21,57 @@ public sealed class Day10 : Day
{ '>', 25137 }
};
private readonly Dictionary<char, int> _scoresClosing = new()
private static readonly Dictionary<char, long> ScoresPart2 = new()
{
{ '(', 1 },
{ '[', 2 },
{ '{', 3 },
{ '<', 4 }
};
public Day10() : base(10, "Syntax Scoring")
{
_input = Input.ToList();
}
public override string Part1()
private readonly long _score1;
private readonly List<long> _scores2 = new();
public Day10() : base(10, "Syntax Scoring")
{
var s = new Stack<char>();
var score = 0;
foreach (var line in _input)
_score1 = 0L;
foreach (var line in Input)
{
var corrupt = false;
var s = new Stack<char>();
foreach (var c in line)
{
if (_openers.Contains(c))
if (ScoresPart2.ContainsKey(c))
{
s.Push(c);
}
else
{
var y = s.Pop();
if (Math.Abs(y - c) <= 3) continue;
score += _scores[c];
if (c == MatchedBrackets[s.Pop()]) continue;
_score1 += Scores[c];
corrupt = true;
break;
}
}
}
return score.ToString();
if (corrupt) continue;
var score2 = 0L;
while (s.Any())
{
score2 *= 5;
score2 += ScoresPart2[s.Pop()];
}
_scores2.Add(score2);
}
}
public override string Part1() => $"{_score1}";
public override string Part2()
{
var sorted = _scores2.OrderBy(i => i).ToList();
return $"{sorted[sorted.Count / 2]}";
}
}

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