Day3 Part2 upload. Set mulAlwaysEnabled to true for Part 1

Advent24/Day2.cs

@@ -0,0 +1,156 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection.Emit;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Advent24
+{
+    internal class Day2
+    {
+        private static Boolean ReportIsSafe(String[] levelsArray, Int32? levelIndexToSkip = null)
+        {
+            Int32 currentLevel;
+            Int32? previousLevel = null;
+            Int32 differenceInLevels = 0;
+            Boolean? isIncreasing = null;
+            Boolean reportIsSafe = true;
+
+            Int32 currentLevelIndex = 0;
+
+            foreach (var level in levelsArray)
+            {
+                Console.WriteLine("{0:s} {1:d}", "    level = ", 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 remain what it was
+
+                    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)
+                    {
+                        // level was decreasing but is now increasing, so report is unsafe
+                        reportIsSafe = false;
+                        break;
+                    }
+                    else isIncreasing = true;
+                    differenceInLevels = currentLevel - (previousLevel ?? 0);
+                }
+                else if (currentLevel < (previousLevel ?? 0))
+                {
+                    // first time, so can't tell trend
+                    if (!previousLevel.HasValue) isIncreasing = null;
+                    else if (isIncreasing ?? false)
+                    {
+                        // 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)
+                {
+                    // 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);
+
+                // control reaches this line if currentLevel = previousLevel
+                // or if it was previously increasing/decreasing and is also 
+                // currently increasing/decreasing
+
+                // confirm that it isn't first time, so a difference in levels is conceptually valid
+                if (previousLevel.HasValue)
+                {
+                    // difference in levels is outside the safe band, so report is unsafe
+                    if (differenceInLevels < 1 || differenceInLevels > 3)
+                    {
+                        reportIsSafe = false;
+                        break;
+                    }
+                }
+
+                // control reaches this line if report has not been proven unsafe yet
+
+                // 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);
+                // if report has not been proven unsafe, then it must be safe
+                if (reportIsSafe) numberOfSafeReports++;
+            }
+            
+            Console.WriteLine("{0:s} {1:d}", "numberOfSafeReports = ", numberOfSafeReports);
+
+            // to make sure the console window doesn't disappear
+            Console.ReadLine();
+        }
+    }
+}

Advent24/Day3.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection.Emit;
+using System.Text;
+using System.Threading.Tasks;
+using System.Text.RegularExpressions;
+
+namespace Advent24
+{
+    internal class Day3
+    {
+        public Day3()
+        {
+            string fileData = System.IO.File.ReadAllText(@"..\..\..\inputd3.txt");
+
+            string pattern = @"((mul\((?<Multiplicand>\d+),(?<Multiplier>\d+)\))|(do\(\))|(don't\(\)))";
+
+            Regex r = new(pattern, RegexOptions.None, TimeSpan.FromMilliseconds(150));
+
+            Match m = r.Match(fileData);
+
+            Int32 productSum = 0;
+
+            Boolean mulAlwaysEnabled = false;
+
+            Boolean mulEnabled = true;
+
+            while (m.Success)
+            {
+                // do() matched
+                if (m.Groups[3].Success)
+                {
+                    mulEnabled = true;
+                    Console.WriteLine("mulEnabled = {0:s}", mulEnabled);
+                }
+                // don't() matched
+                else if (m.Groups[4].Success)
+                {
+                    mulEnabled = false;
+                    Console.WriteLine("mulEnabled = {0:s}", mulEnabled);
+                }
+                // neither do() nor don't() matched
+                else
+                {
+                    if (mulEnabled || mulAlwaysEnabled)
+                    {
+                        productSum += System.Convert.ToInt32(m.Groups["Multiplicand"].Value) * System.Convert.ToInt32(m.Groups["Multiplier"].Value);
+                        Console.WriteLine("{0:s} * {1:s}", m.Groups["Multiplicand"].Value, m.Groups["Multiplier"].Value);
+                    }
+                }
+                // look at the next match
+                m = m.NextMatch();
+            }
+
+            Console.WriteLine("productSum = {0:d}", productSum);
+
+            // to keep the console window from closing
+            Console.ReadKey();
+        }
+    }
+}

Advent24/Program.cs

@@ -7,7 +7,9 @@ namespace Advent24
     {
         static void Main(string[] args)
         {
-            _ = new Day1();
+            //_ = new Day1();
+            //_ = new Day2();
+            _ = new Day3();
         }
     }
 }

Advent24/inputd3.txt

@@ -0,0 +1,6 @@
+mul(498,303);when()}!(%mul(846,233)-,what()($where()how():}mul(334,117)]~>?,<,%^,mul(886,213)/:from()?-how()~}mul(343,197) mul(33,616)~%*~why()^*-from()mul(757,847){{who()why()#mul(927,553)>-?&!-@[mul(589,387)what():[?mul(865,934)#/ (why()+from()when();mul(804,792)-where(144,652)(mul(620,348);];]$mul(584,827):who()^%from()mul(381,633)why()@ when()where()?<;@#do()'< mul(643,715)@@#/>&-@?when(295,120)mul(465,37))]#mul(742,669)?mul(519,650)mul(546,337)@what(),{'^mul(769,202)^mul(808,254)/#why()@~mul(71,204)from();mul(150,335)[mul(302,220)>[$*~don't()mul(385,231)what()?*mul(852,324)#$}<{mul(838,178)<;+}@/*mul(579,121)select()why()*{{:mul(810,214)don't(){what()/)who()*%mul(273,606)&]from()@:why()@mul(788,896) }& don't()select()mul(568,713)$$'<who();[[+what()mul(404,402)+<what()why()mul(931,692)*;when()^where()who()what():<mul(815,388)where(),%~select()/select()what()!mul(492,448)+$)mul(962,335)who()}[<)where()>from()@+mul(390,36):@who();&from()mul(984,787)/mul(209,744)why()%[:what()mul(929,15)+how() who()@what()$!mul(751,670)$]from()mul(821,742)why()}:/why()>mul(445,950)>:mul(174,953)-where()how()+:mul(529,661)+{+@@why()##mul(513,442)how(827,318)}~}where()#@-:mul(941,152)~[,+{&@why()+mul(468,787)how()!$from()^^>%~from()mul(497,717)mul(930,672)mul(313,480)^%where()~-))#^select()mul(407,85)<#who()mul(776,808)~select()$?@,<mul(373,713)?')who()$?[>@mul(420,163)mul(666,491)$:+do()mul(823,835){who()?,mul(728,808))[who()/^<;select()~:mul(38,577)+>mul(985,224):/what()where()[%*what()mul(31,270)<><from()@$;mul(233,598)why()/&}mul(326,395)from(),-;-*:don't() &[who()[mul(730,832)%who()who()@how()(,mul(628,729)mul(332,18){-mul(908,439))<}mul(185,715)what()~!>when()[?!!mul(895,903)%who()select()>/when()!mul(367,623)'#+mul(362,189)&from()'#$':$?{mul(571,203)what()mul(615,719)what(),what() )^mul(663,163)$@;&'select()mul(93,614)~(from()mul(490,261)#mul(530,933)}[from()];don't()$%what()%~'&'what()mul(134,307)}from()%;&why(65,575)?/mul(657,957)where()mul(969,590))how()when()how(){mul(534,951)@},mul(141,80<'mul(573,576)why()mul(952,460from()+<?$;where(),mul(810,772)+:${?mul(334,140)~<)select()%>#;;mul(36,336)&don't()&}how()why()select()^mul(267:+(+#'~<mul(894,946)^))mul(633,59)when()mul(335,809)$mul(680[>mul(654,481)--mul(17,334)'!*why())how();-$mul(886,695)mul(954,476)where()!mul(73,181)?@mul(326,125)!@{)*mul(945,965)what()-select()~^who(884,691)how(846,544)mul(346,328)!<^~+-when(871,168):-mul(653,891why()when()how()why()mul(603,626)~+when()where(639,311),#mul(527,536)how()]%{/!-do()'<when()mul(914,232){:~]&why(937,467)mul(116,640)where()mul(391,784~mul(44,854),+<where();/;@^when()mul(919,687)#))mul(70,882)<how()who()+what()(*/:mul(96,388){^-$why(625,585)-mul(240,319);$:where()how()<$[]mul(524,524)]&*&%&mul(124,571)<,}&{#where()@mul(727,591)how()}&#[:?:mul(481,435),when()who()$[:mul(245,145)where() [/-who()what()how()^mul(943,836)%!'when()mul(703,555)$)[mul(227why()mul(923,88)/}& select()mul(908,970)'+how()<who(628,728)/select()%don't()mul&<{/who()mul(199,227)[),how()[~select()mul(540,629)select()mul(167,775)&;}mul(275,320)^mul(911,818)from()when()+-,*,>@mul(368,63)
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