Completed 2015 day 5

2015/Day-05/Day05.cs

@@ -0,0 +1,68 @@
+using System.Text.RegularExpressions;
+
+List<char> vowels = new List<char>{'a','e','i','o','u'};
+List<string> badStrings = new List<string>{"ab", "cd", "pq", "xy"};
+int goodStrings = 0;
+
+foreach(string line in File.ReadLines("input.txt")){
+    int vowelsInLine = 0;
+    foreach(char letter in line){
+        if(vowels.IndexOf(letter) != -1){
+            vowelsInLine++;
+        }
+    }
+    if(vowelsInLine < 3){
+        continue;
+    }
+
+    int repeatedLetters = 0;
+    for(int i = 1; i < line.Count(); i++){
+        if(line[i-1] == line[i]){
+            repeatedLetters++;
+        }
+    }
+    if(repeatedLetters < 1){
+        continue;
+    }
+
+    int containsBadStrings = 0;
+    foreach(string badString in badStrings){
+        if(line.Contains(badString)){
+            containsBadStrings++;
+        }
+    }
+    if(containsBadStrings > 0){
+        continue;
+    }
+
+    goodStrings++;
+}
+Console.WriteLine("Part 1: " + goodStrings);
+
+goodStrings = 0;
+foreach(string line in File.ReadLines("input.txt")){
+    int repeatedPairs = 0;
+    for(int i = 1; i < line.Count(); i++){
+        string currentPair = (line[i-1].ToString() + line[i].ToString());
+        int numMatches = Regex.Matches(line, currentPair).Count();
+        if(numMatches > 1){
+            repeatedPairs++;
+        }
+    }
+    if(repeatedPairs<1){
+        continue;
+    }
+    int repeatedLettersPart2 = 0;
+    for(int i = 0; i < line.Count()-2; i++){
+        if(line[i+2] == line[i]){
+            repeatedLettersPart2++;
+        }
+    }
+    if(repeatedLettersPart2 < 1){
+        continue;
+    }
+
+    goodStrings++;
+
+}
+Console.WriteLine("Part 2: " + goodStrings);