day 14 part 1

AdventOfCode/Day14.cs

@@ -0,0 +1,93 @@
+
+using System.Text.RegularExpressions;
+
+namespace AdventOfCode;
+
+public class Day14 : BaseDay
+{
+    List<Robot> _robots = new List<Robot>();
+
+    public Day14()
+    {
+        string[] lines = File.ReadAllLines(InputFilePath);
+        _robots = lines.Select(Robot.Parse).ToList();
+    }
+
+    public override ValueTask<string> Solve_1()
+    {
+        int width = 101;
+        int height = 103;
+        for (int i = 0; i < 100; i++)
+        {
+            foreach (Robot robot in _robots)
+            {
+                robot.Move(width, height);
+            }
+        }
+
+        int quadrant1 = GetRobotsCount(0, width / 2 - 1, 0, height / 2 - 1);
+        int quadrant2 = GetRobotsCount(width / 2 + 1, width - 1, 0, height / 2 - 1);
+        int quadrant3 = GetRobotsCount(0, width / 2 - 1, height / 2 + 1, height - 1);
+        int quadrant4 = GetRobotsCount(width / 2 + 1, width - 1, height / 2 + 1, height - 1);
+
+        int result = quadrant1 * quadrant2 * quadrant3 * quadrant4;
+
+        return new(result.ToString());
+    }
+
+    public override ValueTask<string> Solve_2()
+    {
+        return new("");
+    }
+
+    private int GetRobotsCount(int xStart, int xEnd, int yStart, int yEnd)
+    { 
+        return _robots.Count(r => r.XPosition >= xStart && r.XPosition <= xEnd
+            && r.YPosition >= yStart && r.YPosition <= yEnd);
+    }
+
+    public class Robot(int XPosition, int YPosition, int XVelocity, int YVelocity)
+    {
+        public static Robot Parse(string input)
+        {
+            Match match = Regex.Match(input, "p=([0-9]+),([0-9]+) v=([\\-0-9]+),([\\-0-9]+)");
+            return new Robot(
+                int.Parse(match.Groups[1].Value),
+                int.Parse(match.Groups[2].Value),
+                int.Parse(match.Groups[3].Value),
+                int.Parse(match.Groups[4].Value)
+            );
+        }
+
+        public int XPosition { get; private set; } = XPosition;
+        public int YPosition { get; private set; } = YPosition;
+        public int XVelocity { get; private set; } = XVelocity;
+        public int YVelocity { get; private set; } = YVelocity;
+
+        public void Move(int fieldWidth, int fieldHeight)
+        {
+            int newXPosition = XPosition + XVelocity;
+            if (newXPosition < 0)
+            {
+                newXPosition = fieldWidth + newXPosition;
+            }
+            else if (newXPosition >= fieldWidth)
+            {
+                newXPosition -= fieldWidth;
+            }
+
+            int newYPosition = YPosition + YVelocity;
+            if (newYPosition < 0)
+            {
+                newYPosition = fieldHeight + newYPosition;
+            }
+            else if (newYPosition >= fieldHeight)
+            {
+                newYPosition -= fieldHeight;
+            }
+
+            XPosition = newXPosition;
+            YPosition = newYPosition;
+        }
+    }
+}