New Shared Library

day16/16a/main.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"math"
+	"os"
+	"strings"
+)
+
+func main() {
+	content := returnContent("../input")
+	//content := returnContent("../testInput")
+	fmt.Println(content)
+
+	startingString := (*content)[0]
+	pairs := make(map[string]string)
+	count := make(map[string]int)
+
+	//Create map of pair values
+	for i := 2; i < len(*content); i++ {
+		split := strings.Split((*content)[i], " -> ")
+		pairs[split[0]] = split[1]
+	}
+
+	//Fill initial list
+	list := LinkedList{Head: &Node{Value: string(startingString[0]), Next: nil}}
+	current := list.Head
+	for i := 1; i < len(startingString); i++ {
+		node := &Node{Value: string(startingString[i]), Next: nil}
+		count[string(startingString[i])]++
+		current.Next = node
+		current = node
+	}
+
+	//Run iterations on list
+	iterations := 10
+	for i := 1; i <= iterations; i++ {
+		current = list.Head
+
+		for current.Next != nil {
+			value := pairs[current.Value+current.Next.Value]
+			list.InsertItem(current, current.Next, value)
+			count[value]++
+			current = current.Next.Next
+		}
+		list.PrintList()
+	}
+
+	//determine min and max
+	min := math.MaxInt
+	max := 0
+	for _, value := range count {
+		if value > max {
+			max = value
+		} else if value < min {
+			min = value
+		}
+	}
+
+	fmt.Println(max - min)
+
+}
+
+type LinkedList struct {
+	Head *Node
+}
+
+func (l *LinkedList) InsertItem(first *Node, second *Node, value string) {
+	first.Next = &Node{Value: value, Next: second}
+}
+
+func (l *LinkedList) PrintList() {
+	list := []string{}
+	current := l.Head
+	for current != nil {
+		list = append(list, current.Value)
+		current = current.Next
+	}
+	fmt.Println(list)
+}
+
+type Node struct {
+	Value string
+	Next  *Node
+}
+
+func returnContent(path string) *[]string {
+	//read file and return it as an array of integers
+
+	file, err := os.Open(path)
+	var content []string
+
+	if err != nil {
+		fmt.Println("Unlucky, the file didn't open")
+		return &content
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+
+	for scanner.Scan() {
+		content = append(content, scanner.Text())
+	}
+
+	return &content
+}