d10p2

aoc2021.test/DayTests.cs

@@ -13,6 +13,7 @@ public class DayTests
     [DataRow(typeof(Day07), "345035", "97038163")]
     [DataRow(typeof(Day08), "362", "1020159")]
     [DataRow(typeof(Day09), "478", "1327014")]
+    [DataRow(typeof(Day10), "288291", "820045242")]
     public void CheckAllDays(Type dayType, string part1, string part2)
     {
         var s = Stopwatch.StartNew();
@@ -52,6 +53,7 @@ public class DayTests
     [DataRow(typeof(Day07), "37", "168")]
     [DataRow(typeof(Day08), "26", "61229")]
     [DataRow(typeof(Day09), "15", "1134")]
+    [DataRow(typeof(Day10), "26397", "288957")]
     public void CheckTestInputs(Type dayType, string part1, string part2)
     {
         Day.UseTestInput = true;

aoc2021/Day10.cs

@@ -0,0 +1,77 @@
+namespace aoc2021;
+
+/// <summary>
+/// Day 10: <see href="https://adventofcode.com/2021/day/10"/>
+/// </summary>
+public sealed class Day10 : Day
+{
+    private static readonly Dictionary<char, char> MatchedBrackets = new()
+    {
+        {'(', ')'},
+        {'[', ']'},
+        {'{', '}'},
+        {'<', '>'}
+    };
+
+    private static readonly Dictionary<char, long> Scores = new()
+    {
+        { ')', 3 },
+        { ']', 57 },
+        { '}', 1197 },
+        { '>', 25137 }
+    };
+
+    private static readonly Dictionary<char, long> ScoresPart2 = new()
+    {
+        { '(', 1 },
+        { '[', 2 },
+        { '{', 3 },
+        { '<', 4 }
+    };
+
+    private readonly long _score1;
+    private readonly List<long> _scores2 = new();
+
+    public Day10() : base(10, "Syntax Scoring")
+    {
+        _score1 = 0L;
+        foreach (var line in Input)
+        {
+            var corrupt = false;
+            var s = new Stack<char>();
+
+            foreach (var c in line)
+            {
+                if (ScoresPart2.ContainsKey(c))
+                {
+                    s.Push(c);
+                }
+                else
+                {
+                    if (c == MatchedBrackets[s.Pop()]) continue;
+                    _score1 += Scores[c];
+                    corrupt = true;
+                    break;
+                }
+            }
+
+            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]}";
+    }
+}

aoc2021/input/day10.in

@@ -0,0 +1,102 @@
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aoc2021/input/test10.in

@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
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