feat(*): Add 2021-08 files (part 1 working, part 2 not)

2026-07-12 18:53:47 +00:00 · 2021-12-08 07:19:32 +00:00
parent 6b51590b8b
commit 12b0a55e53
5 changed files with 255 additions and 0 deletions
@@ -0,0 +1,118 @@
+namespace Day08
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            string[] lines = File.ReadAllLines("input.txt");
+            
+
+            //Part1(lines);
+            Part2(lines);
+        }
+
+        static void Part1(string[] lines)
+        {
+            // 8 has only 7 segments/letters 
+
+            // 7 has only 3 segments/letters
+
+            // 4 has only 4 segments/letters
+
+            // 1 has only 2 segments/letters
+
+            // Count how often groups of letters with 2/3/4/7 segments occur after the split 
+            int count = 0;
+            foreach (string line in lines)
+            {
+                string secondHalf = line.Substring(line.IndexOf("|") + 1);
+                List<string> numberSegments = secondHalf.Split(' ').ToList();
+
+                foreach (string numberSegment in numberSegments)
+                {
+                    switch (numberSegment.Length)
+                    {
+                        case 7:
+                        case 3:
+                        case 4:
+                        case 2:
+                            count += 1;
+                            break;
+                        default:
+                            // code block
+                            break;
+                    }
+                }
+            }
+
+            Console.WriteLine(count);
+        }
+
+        static void Part2(string[] lines)
+        {
+            int total = 0;
+            foreach (string line in lines)
+            {
+                string secondHalf = line.Substring(line.IndexOf("|") + 1);
+                List<string> numberSegments = secondHalf.Split(' ').ToList();
+
+                string lineTotal = string.Empty;
+
+                foreach (string numberSegment in numberSegments)
+                {
+                    // Go through sorted in alphabetical order
+                    string alphabetisedNumberSegment = String.Concat(numberSegment.OrderBy(c => c));
+
+                    if(alphabetisedNumberSegment == String.Concat("acedgfb".OrderBy(c => c)))
+                    {
+                        lineTotal += "8";
+                    }
+                    else if(alphabetisedNumberSegment == String.Concat("cdfbe".OrderBy(c => c)))
+                    {
+                        lineTotal += "5";
+                    }
+                    else if(alphabetisedNumberSegment == String.Concat("gcdfa".OrderBy(c => c)))
+                    {
+                        lineTotal += "2";
+                    }
+                    else if(alphabetisedNumberSegment == String.Concat("fbcad".OrderBy(c => c)))
+                    {
+                        lineTotal += "3";
+                    }
+                    else if(alphabetisedNumberSegment == String.Concat("dab".OrderBy(c => c)))
+                    {
+                        lineTotal += "7";
+                    }
+                    else if(alphabetisedNumberSegment == String.Concat("cefabd".OrderBy(c => c)))
+                    {
+                        lineTotal += "9";
+                    }
+                    else if(alphabetisedNumberSegment == String.Concat("cdfgeb".OrderBy(c => c)))
+                    {
+                        lineTotal += "6";
+                    }
+                    else if(alphabetisedNumberSegment == String.Concat("eafb".OrderBy(c => c)))
+                    {
+                        lineTotal += "4";
+                    }
+                    else if(alphabetisedNumberSegment == String.Concat("cagedb".OrderBy(c => c)))
+                    {
+                        lineTotal += "0";
+                    }
+                    else if(alphabetisedNumberSegment == String.Concat("ab".OrderBy(c => c)))
+                    {
+                        lineTotal += "1";
+                    }
+                }
+
+                Console.WriteLine(lineTotal);
+                if (!string.IsNullOrEmpty(lineTotal))
+                {
+                    total += int.Parse(lineTotal);
+                }
+            }
+
+            Console.WriteLine(total);
+        }
+    }
+}