From 9e3c218ffe8fa3d375b7e83ac3f241f93d4ef7d6 Mon Sep 17 00:00:00 2001
From: Rob Stoffelen <r.stoffelen@solvisoft.com>
Date: Mon, 2 Dec 2024 09:16:36 +0100
Subject: [PATCH] Completed day 2

---
 AdventOfCode.Solutions/2024/Day 02/Day02.cs | 99 ++++++++-------------
 1 file changed, 35 insertions(+), 64 deletions(-)

diff --git a/AdventOfCode.Solutions/2024/Day 02/Day02.cs b/AdventOfCode.Solutions/2024/Day 02/Day02.cs
index 9f58f67..7048d51 100644
--- a/AdventOfCode.Solutions/2024/Day 02/Day02.cs	
+++ b/AdventOfCode.Solutions/2024/Day 02/Day02.cs	
@@ -18,76 +18,47 @@ namespace AdventOfCode.Solutions._2024
         }
 
         //2
-        //
-        public async Task<string> GetSolutionPart1()
-        {
-            //_inputReader.SetSampleInput(true);
-            string[] data = await _inputReader.ReadAsArrayString();
-            int save = data.Length;
-            foreach (string line in data)
-            {
-                int[] intData = line.Split(' ').Select(int.Parse).ToArray();
-                bool isIncrease = intData[1] < intData[0];
-                for (int index = 1; index < intData.Length; index++)
-                {
-                    int trueDiff = intData[index - 1] - intData[index];
-                    int diff = Math.Abs(trueDiff);
-                    if (diff < 1 || diff > 3)
-                    {
-                        save--;
-                        break;
-                    } 
+        //230
+        public async Task<string> GetSolutionPart1() 
+            => (await _inputReader.ReadAsArrayString())
+                .Select(ParselineToReports)
+                .Where(reports => AreReportsSave(reports, false))
+                .Count()
+                .ToString();
 
-                    if (isIncrease && trueDiff < 0)
-                    {
-                        save--;
-                        break;
-                    }
-                    else if (!isIncrease && trueDiff > 0)
-                    {
-                        save--;
-                        break;
-                    }
+        //4
+        //301
+        public async Task<string> GetSolutionPart2() => (await _inputReader.ReadAsArrayString())
+                .Select(ParselineToReports)
+                .Where(reports => AreReportsSave(reports, true))
+                .Count()
+                .ToString();
+
+        private static bool AreReportsSave(int[] reports, bool tolarance = false)
+        {
+            bool isIncrease = reports[1] < reports[0];
+            for (int index = 1; index < reports.Length; index++)
+            {
+                int trueDiff = reports[index - 1] - reports[index];
+                int diff = Math.Abs(trueDiff);
+                if (diff < 1 || diff > 3)
+                {
+                    return tolarance && HasSafeCombo(reports);
+                }
+
+                if ((isIncrease && trueDiff < 0) || (!isIncrease && trueDiff > 0))
+                {
+                    return tolarance && HasSafeCombo(reports);
                 }
             }
 
-            return save.ToString();
+            return true;
         }
 
-        //
-        //
-        public async Task<string> GetSolutionPart2()
-        {
-            string[] data = await _inputReader.ReadAsArrayString();
-            int save = data.Length;
-            foreach (string line in data)
-            {
-                int[] intData = line.Split(' ').Select(int.Parse).ToArray();
-                bool isIncrease = intData[1] < intData[0];
-                for (int index = 1; index < intData.Length; index++)
-                {
-                    int trueDiff = intData[index - 1] - intData[index];
-                    int diff = Math.Abs(trueDiff);
-                    if (diff < 1 || diff > 3)
-                    {
-                        save--;
-                        break;
-                    }
+        private static bool HasSafeCombo(int[] reports)
+            => reports.Select((_, i) => SkipReport(reports, i)).Any(reports => AreReportsSave(reports));
 
-                    if (isIncrease && trueDiff < 0)
-                    {
-                        save--;
-                        break;
-                    }
-                    else if (!isIncrease && trueDiff > 0)
-                    {
-                        save--;
-                        break;
-                    }
-                }
-            }
-
-            return save.ToString();
-        }
+        private static int[] SkipReport(int[] reports, int index) => reports.Where((_, i) => i != index).ToArray();
+        private static int[] ParselineToReports(string line) => line.Split(' ').Select(int.Parse).ToArray();
     }
 }
\ No newline at end of file