Big update: Adding all advent of codes to same repo

AdventOfCode2021/day14/day14.go

@@ -0,0 +1,47 @@
+package day14
+
+import (
+	"strings"
+)
+
+func Run(dat []byte) (int64, int64) {
+  
+  lines := strings.Split(string(dat), "\n")
+  template := lines[0]
+  patterns := lines[2 : len(lines) - 1]
+
+  pairInsertions := make(map[string]string, len(patterns))
+  for i := 0; i < len(patterns); i++ {
+    pairSplit := strings.Split(patterns[i], " ")
+    pairInsertions[pairSplit[0]] = pairSplit[2]
+  }
+
+  for round := 0; round < 40; round++ {
+    
+    newTemplate := string(template[0])
+    for i := 0; i < len(template) - 1; i++ {
+      pair := template[i:i + 2]
+      newLetter := pairInsertions[pair]
+      newTemplate += newLetter + string(pair[1])
+    } 
+    template = newTemplate
+
+  }
+
+  letterMap := make(map[byte]int64, 0)
+  for i := 0; i < len(template); i++ {
+    letterMap[template[i]] += 1
+  }
+
+  highest := int64(0)
+  lowest := int64(999999)
+  for _, v := range letterMap {
+    if v > highest {
+      highest = v
+    } else if v < lowest {
+      lowest = v
+    }
+  }
+
+  return (highest - lowest), 0
+}