Day2 updated attempt

Advent24/Day2.cs

@@ -9,79 +9,50 @@ namespace Advent24
 {
     internal class Day2
     {
-        public Day2()
+        private static Boolean ReportIsSafe(String[] levelsArray, Int32? levelIndexToSkip = null)
         {
-            string fileData = System.IO.File.ReadAllText(@"..\..\..\inputd2.txt");
+            Int32 currentLevel;
-            var reportsArray = fileData.Split('\n');
-
-            Int32 numberOfSafeReports = 0;
-
-
-            foreach (var report in reportsArray)
-            {
-                if (System.String.IsNullOrEmpty(report)) continue;
-                
-                Console.WriteLine("{0:s} {1:d}", "report = ", report);
-
-                var levelsArray = report.Split(' ');
-
-                Int32 currentLevel = 0;
             Int32? previousLevel = null;
             Int32? previousPreviousLevel = null;
-                Int32? discardedLevel = null;
             Int32 differenceInLevels = 0;
             Boolean? isIncreasing = null;
             Boolean reportIsSafe = true;
-                Boolean problemDampenerEnabled = true;
+
+            Int32 currentLevelIndex = 0;
 
             foreach (var level in levelsArray)
             {
                 Console.WriteLine("{0:s} {1:d}", "    level = ", level);
 
-                    currentLevel = System.Convert.ToInt32(level);
+                // if there is no elementIndexToSkip, assume sentinel value -1
+                // so that it never matches the currentElementIndex
+                if((levelIndexToSkip ?? -1) == currentLevelIndex)
+                {
+                    // assume current element doesn't exist, so the previous
+                    // element should be the one that was before it
+                    previousLevel = previousPreviousLevel;
 
-                    RestartIteration:
+                    Console.WriteLine("{0:s} {1:d}", "    currentLevelIndex (skipped) = ", currentLevelIndex);
+
+                    // if (currentLevelIndex != 0) Console.ReadKey();
+
+                    // increment the currentElementIndex and short-circuit the loop
+                    currentLevelIndex++;
+                    continue;
+                }
+
+                currentLevel = System.Convert.ToInt32(level);
 
                 if (currentLevel > (previousLevel ?? 0))
                 {
                     // first time, so can't tell trend
                     if (!previousLevel.HasValue) isIncreasing = null;
                     else if ((!isIncreasing) ?? false)
-                        {
-                            if (problemDampenerEnabled)
-                            {
-                                // store previous level in discardedLevel to instead be
-                                // able to assume the previous level doesn't exist - only
-                                // if this is the second level
-                                discardedLevel = previousLevel;
-
-                                // assume the current level didn't exist
-                                previousLevel = previousPreviousLevel;
-
-                                Console.WriteLine("{0:s} {1:d}", "    problemDampenerActivated: new previousLevel = ", previousLevel);
-                                Console.ReadLine();
-
-                                // problemDampener used, so disabled for the rest of the report
-                                problemDampenerEnabled = false;
-
-                                // previous level had a value and previousPreviousLevel didn't,
-                                // so this is the second level, so we assume the previous level
-                                // doesn't exist and rerun this iteration
-                                if(discardedLevel.HasValue && !previousPreviousLevel.HasValue)
-                                {
-
-                                }
-
-                                // continue to the next iteration
-                                continue;
-                            }
-                            else
                     {
                         // level was decreasing but is now increasing, so report is unsafe
                         reportIsSafe = false;
                         break;
                     }
-                        }
                     else isIncreasing = true;
                     differenceInLevels = currentLevel - (previousLevel ?? 0);
                 }
@@ -90,64 +61,20 @@ namespace Advent24
                     // first time, so can't tell trend
                     if (!previousLevel.HasValue) isIncreasing = null;
                     else if (isIncreasing ?? false)
-                        {
-                            if (problemDampenerEnabled)
-                            {
-                                // store previous level in discardedLevel to instead be
-                                // able to assume the previous level doesn't exist - only
-                                // if this is the second level
-                                discardedLevel = previousLevel;
-
-                                // assume the previous level didn't exist
-                                previousLevel = previousPreviousLevel;
-
-                                Console.WriteLine("{0:s} {1:d}", "    problemDampenerActivated: new previousLevel = ", previousLevel);
-                                Console.ReadLine();
-
-                                // problemDampener used, so disabled for the rest of the report
-                                problemDampenerEnabled = false;
-
-                                // continue to the next iteration
-                                continue;
-                            }
-                            else
                     {
                         // level was increasing but is now decreasing, so report is unsafe
                         reportIsSafe = false;
                         break;
                     }
-                        }
                     else isIncreasing = false;
                     differenceInLevels = (previousLevel ?? 0) - currentLevel;
                 }
                 else if (previousLevel.HasValue)
-                    {
-                        if (problemDampenerEnabled)
-                        {
-                            // store previous level in discardedLevel to instead be
-                            // able to assume the previous level doesn't exist - only
-                            // if this is the second level
-                            discardedLevel = previousLevel;
-
-                            // assume previous level didn't exist
-                            previousLevel = previousPreviousLevel;
-
-                            Console.WriteLine("{0:s} {1:d}", "    problemDampenerActivated: new previousLevel = ", previousLevel);
-                            Console.ReadLine();
-
-                            // problemDampener used, so disabled for the rest of the report
-                            problemDampenerEnabled = false;
-
-                            // continue to the next iteration
-                            continue;
-                        }
-                        else
                 {
                     // both currentLevel and previousLevel are equal, so report is unsafe
                     reportIsSafe = false;
                     break;
                 }
-                    }
 
                 Console.WriteLine("{0:s} {1:d}", "    differenceInLevels = ", differenceInLevels);
                 Console.WriteLine("{0:s} {1:d}", "    isIncreasing = ", isIncreasing);
@@ -161,41 +88,61 @@ namespace Advent24
                 {
                     // difference in levels is outside the safe band, so report is unsafe
                     if (differenceInLevels < 1 || differenceInLevels > 3)
-                        {
-                            if (problemDampenerEnabled)
-                            {
-                                // store previous level in discardedLevel to instead be
-                                // able to assume the previous level doesn't exist - only
-                                // if this is the second level
-                                discardedLevel = previousLevel;
-
-                                // assume the previous level didn't exist
-                                previousLevel = previousPreviousLevel;
-
-                                Console.WriteLine("{0:s} {1:d}", "    problemDampenerActivated: new previousLevel = ", previousLevel);
-                                Console.ReadLine();
-
-                                // problemDampener used, so disabled for the rest of the report
-                                problemDampenerEnabled = false;
-
-                                // continue to the next iteration
-                                continue;
-                            }
-                            else
                     {
                         reportIsSafe = false;
                         break;
                     }
                 }
-                    }
 
                 // control reaches this line if report has not been proven unsafe yet
 
-                    // updating previousPreviousLevel in preparation for the next iteration
+                // updating previousLevel and previousPreviousLevel in preparation for the next iteration
-                    // if problemDampener is still enabled
+                previousPreviousLevel = previousLevel;
-                    if(problemDampenerEnabled) previousPreviousLevel = previousLevel;
-                    // updating previousLevel in preparation for the next iteration
                 previousLevel = currentLevel;
+
+                // incrementing the current-element-number indicator
+                currentLevelIndex++;
+            }
+
+            return reportIsSafe;
+        }
+
+        public Day2()
+        {
+            string fileData = System.IO.File.ReadAllText(@"..\..\..\inputd2.txt");
+            var reportsArray = fileData.Split('\n', StringSplitOptions.RemoveEmptyEntries);
+
+            Int32 numberOfSafeReports = 0;
+
+
+            foreach (var report in reportsArray)
+            {
+                if (System.String.IsNullOrEmpty(report)) continue;
+                
+                Console.WriteLine("{0:s} {1:d}", "report = ", report);
+
+                var levelsArray = report.Split(' ');
+
+                Int32 numberOfLevels = levelsArray.Length;
+                Boolean reportIsSafe = false;
+
+                // iterate through each index to check subreports
+                // for safety
+                for (Int32 i = 0; i < numberOfLevels; i++)
+                {
+                    // check if the current subreport is safe
+                    reportIsSafe = ReportIsSafe(levelsArray, i);
+
+                    // if any subreport is safe, the report is safe,
+                    // so we don't need to check any of the other
+                    // subreports and can break
+                    if (reportIsSafe) break;
+                }
+
+                // check full report for safety if report is still not proven safe
+                if (!reportIsSafe)
+                {
+                    reportIsSafe = ReportIsSafe(levelsArray);
                 }
 
                 Console.WriteLine("{0:s} {1:d}", "    reportIsSafe = ", reportIsSafe);