From a496112b2584dec839a70acc463afa68589ef11d Mon Sep 17 00:00:00 2001
From: TiagoRG <tiago.rgarcia@ua.pt>
Date: Wed, 7 Jun 2023 23:28:51 +0100
Subject: [PATCH] [2022] Day4 added

---
 AdventOfCode/Program.cs       |  1 +
 AdventOfCode/Year2022/Day4.cs | 50 +++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 AdventOfCode/Year2022/Day4.cs

diff --git a/AdventOfCode/Program.cs b/AdventOfCode/Program.cs
index 43d55d6..411452e 100644
--- a/AdventOfCode/Program.cs
+++ b/AdventOfCode/Program.cs
@@ -9,6 +9,7 @@ class Program
         new Day1();
         new Day2();
         new Day3();
+        new Day4();
         new Day7();
     }
 }
\ No newline at end of file
diff --git a/AdventOfCode/Year2022/Day4.cs b/AdventOfCode/Year2022/Day4.cs
new file mode 100644
index 0000000..0a25666
--- /dev/null
+++ b/AdventOfCode/Year2022/Day4.cs
@@ -0,0 +1,50 @@
+namespace AdventOfCode.Year2022;
+
+public class Day4
+{
+    public Day4()
+    {
+        Console.WriteLine("Day4 Solution\n");
+
+        string[] lines = File.ReadAllLines("inputs/day4.txt");
+        int containedCount = 0;
+        int intersectedCount = 0;
+        foreach (string line in lines)
+        {
+            if (IsContained(line))
+                containedCount++;
+            if (IsIntersected(line))
+                intersectedCount++;
+        }
+        
+        Console.WriteLine($"Part1\nResult: {containedCount}\n");
+        Console.WriteLine($"Part2\nResult: {intersectedCount}\n");
+        Console.WriteLine("=============================\n");
+    }
+
+    public static bool IsContained(string line)
+    {
+        int[][] limits = GetLimits(line);
+        return (limits[0][0] >= limits[1][0] && limits[0][1] <= limits[1][1])
+            || (limits[1][0] >= limits[0][0] && limits[1][1] <= limits[0][1]);
+    }
+    
+    public static bool IsIntersected(string line)
+    {
+        int[][] limits = GetLimits(line);
+        return (limits[0][1] >= limits[1][0] && limits[0][0] <= limits[1][1])
+               || (limits[1][1] >= limits[0][0] && limits[1][0] <= limits[0][1]);
+    }
+
+    public static int[][] GetLimits(string line)
+    {
+        string[] pair = line.Split(",");
+        string[] pair1 = pair[0].Split("-");
+        string[] pair2 = pair[1].Split("-");
+        return new []
+        {
+            new [] {Convert.ToInt32(pair1[0]), Convert.ToInt32(pair1[1])},
+            new [] {Convert.ToInt32(pair2[0]), Convert.ToInt32(pair2[1])}
+        };
+    }
+}
\ No newline at end of file