2023 day 6

AOC.Test/Test2023.cs

@@ -10,6 +10,7 @@ public class Test2023
     [DataRow(typeof(Day02), "2476", "54911")]
     [DataRow(typeof(Day03), "522726", "81721933")]
     [DataRow(typeof(Day04), "20117", "13768818")]
+    [DataRow(typeof(Day06), "505494", "2362299")]
     public void CheckAllDays(Type dayType, string part1, string part2) =>
         Common.CheckDay(dayType, part1, part2);
 
@@ -19,6 +20,7 @@ public class Test2023
     [DataRow(typeof(Day03), "4361", "467835")]
     [DataRow(typeof(Day04), "13", "30")]
     // [DataRow(typeof(Day05), "35", "")]
+    [DataRow(typeof(Day06), "288", "71503")]
     public void CheckTestInputs(Type dayType, string part1, string part2) =>
         Common.CheckDay(dayType, part1, part2, true);
 }

AOC2023/Day06.cs

@@ -0,0 +1,55 @@
+namespace AOC2023;
+
+public class Day06() : Day(2023, 6, "Wait For It")
+{
+    private readonly List<(int time, int distance)> _races = [];
+
+    public override void ProcessInput()
+    {
+        var input = Input.Select(l =>
+            l.Split(' ', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries)
+                .Skip(1)
+                .Select(int.Parse)
+                .ToList()
+        ).ToList();
+
+        for (var i = 0; i < input[0].Count; i++)
+            _races.Add((input[0][i], input[1][i]));
+    }
+
+    public override object Part1() =>
+        _races.Select(race =>
+        {
+            var cnt = 0;
+            for (var speed = 1; speed < race.time; speed++)
+                if (speed * (race.time - speed) > race.distance)
+                    cnt++;
+
+            return cnt;
+        }).Aggregate(1, (a, b) => a * b);
+
+    public override object Part2()
+    {
+        var input = Input.ToList();
+        var time = ulong.Parse(input[0].Replace(" ", "").Replace("Time:", ""));
+        var distance = ulong.Parse(input[1].Replace(" ", "").Replace("Distance:", ""));
+
+        var shortestPress = 0ul;
+        for (var speed = 0ul; speed < time; speed++)
+            if (speed * (time - speed) > distance)
+            {
+                shortestPress = speed;
+                break;
+            }
+
+        var longestPress = 0ul;
+        for (var speed = time; speed > 0; speed--)
+            if (speed * (time - speed) > distance)
+            {
+                longestPress = speed;
+                break;
+            }
+
+        return longestPress - shortestPress + 1;
+    }
+}

AOC2023/input2023/day06.in

@@ -0,0 +1,2 @@
+Time:        40     82     91     66
+Distance:   277   1338   1349   1063

AOC2023/input2023/test06.in

@@ -0,0 +1,2 @@
+Time:      7  15   30
+Distance:  9  40  200