day 16a complete

day03/3a/main.go

@@ -1,9 +1,9 @@
 package main
 
 import (
+	"AdventOfCode2021/shared"
 	"bufio"
 	"fmt"
-	"math"
 	"os"
 )
 
@@ -13,7 +13,7 @@ func main() {
 
 	gamma, epsilon := findGammaAndEpsilon(content)
 
-	fmt.Println(binaryToInteger(gamma) * binaryToInteger(epsilon))
+	fmt.Println(shared.BinaryToInteger(&gamma) * shared.BinaryToInteger(&epsilon))
 
 }
 
@@ -40,17 +40,6 @@ func findGammaAndEpsilon(content *[]string) (gamma string, epsilon string) {
 	return
 }
 
-func binaryToInteger(input string) (value int) {
-	n := 0
-	for i := len(input) - 1; i >= 0; i-- {
-		if input[i] == '1' {
-			value += (int(math.Pow(float64(2), float64(n))))
-		}
-		n++
-	}
-	return
-}
-
 func returnContent(path string) *[]string {
 	//read file and return it as an array of integers
 

day16/16a/main.go

@@ -1,95 +1,60 @@
 package main
 
 import (
+	"AdventOfCode2021/shared"
 	"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)
+	binary := shared.HexToBinary(content)
 
-	//Create map of pair values
-	for i := 2; i < len(*content); i++ {
-		split := strings.Split((*content)[i], " -> ")
-		pairs[split[0]] = split[1]
-	}
+	pointer := 0
+	version := 0
 
-	//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
-	}
+	for pointer < len(binary)-6 {
+		//Get version from first 3 Bits
+		current := ""
+		current = binary[pointer : pointer+3]
+		version += shared.BinaryToInteger(&current)
+		pointer += 3
 
-	//Run iterations on list
-	iterations := 10
-	for i := 1; i <= iterations; i++ {
-		current = list.Head
+		//determine packet type ID from next 2 bits
+		current = ""
+		current = binary[pointer : pointer+3]
+		typeID := shared.BinaryToInteger(&current)
+		pointer += 3
 
-		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()
-	}
+		if typeID == 4 {
+			//literal value
+			for binary[pointer] == '1' {
+				pointer += 5
+			}
+			pointer += 5
 
-	//determine min and max
-	min := math.MaxInt
-	max := 0
-	for _, value := range count {
-		if value > max {
-			max = value
-		} else if value < min {
-			min = value
+		} else {
+			//operator value
+			if binary[pointer] == '1' {
+				pointer += 12
+			} else {
+				pointer += 16
+			}
 		}
 	}
 
-	fmt.Println(max - min)
+	fmt.Println(version)
 
 }
 
-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 {
+func returnContent(path string) *string {
 	//read file and return it as an array of integers
 
 	file, err := os.Open(path)
-	var content []string
+	var content string
 
 	if err != nil {
 		fmt.Println("Unlucky, the file didn't open")
@@ -100,7 +65,7 @@ func returnContent(path string) *[]string {
 	scanner := bufio.NewScanner(file)
 
 	for scanner.Scan() {
-		content = append(content, scanner.Text())
+		content = scanner.Text()
 	}
 
 	return &content

day16/input

@@ -1,102 +1 @@
-SHHBNFBCKNHCNOSHHVFF
-
-CK -> N
-VP -> B
-CF -> S
-FO -> V
-VC -> S
-BV -> V
-NP -> P
-SN -> C
-KN -> V
-NF -> P
-SB -> C
-PC -> B
-OB -> V
-NS -> O
-FH -> S
-NK -> S
-HO -> V
-NV -> O
-FV -> O
-FB -> S
-PS -> S
-FN -> K
-HS -> O
-CB -> K
-HV -> P
-NH -> C
-BO -> B
-FF -> N
-PO -> F
-BB -> N
-PN -> C
-BP -> C
-HN -> K
-CO -> P
-BF -> H
-BC -> S
-CV -> B
-VV -> F
-FS -> B
-BN -> P
-VK -> S
-PV -> V
-PP -> B
-PH -> N
-SS -> O
-SK -> S
-NC -> P
-ON -> F
-NB -> N
-CC -> N
-SF -> H
-PF -> H
-OV -> O
-KH -> C
-CP -> V
-PK -> O
-KC -> K
-KK -> C
-KF -> B
-HP -> C
-FK -> H
-BH -> K
-VN -> H
-OO -> S
-SC -> K
-SP -> B
-KO -> V
-KV -> F
-HK -> N
-FP -> N
-NN -> B
-VS -> O
-HC -> K
-BK -> N
-KS -> K
-VB -> O
-OH -> F
-KB -> F
-KP -> H
-HB -> N
-NO -> N
-OF -> O
-BS -> H
-VO -> H
-SH -> O
-SV -> K
-HF -> C
-CS -> F
-FC -> N
-VH -> H
-OP -> K
-OK -> H
-PB -> K
-HH -> S
-OC -> V
-VF -> B
-CH -> K
-CN -> C
-SO -> P
-OS -> O
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

day16/testInput

@@ -1,18 +1 @@
-NNCB
-
-CH -> B
-HH -> N
-CB -> H
-NH -> C
-HB -> C
-HC -> B
-HN -> C
-NN -> C
-BH -> H
-NC -> B
-NB -> B
-BN -> B
-BB -> N
-BC -> B
-CC -> N
-CN -> C
+620080001611562C8802118E34

shared/Binary.go

@@ -0,0 +1,42 @@
+package shared
+
+import "math"
+
+func BinaryToInteger(binaryString *string) (value int) {
+	n := 0
+	for i := len(*binaryString) - 1; i >= 0; i-- {
+		if (*binaryString)[i] == '1' {
+			value += (int(math.Pow(float64(2), float64(n))))
+		}
+		n++
+	}
+	return
+}
+
+func HexToBinary(hexString *string) (binary string) {
+	hexMap := make(map[string]string)
+
+	hexMap["0"] = "0000"
+	hexMap["1"] = "0001"
+	hexMap["2"] = "0010"
+	hexMap["3"] = "0011"
+	hexMap["4"] = "0100"
+	hexMap["5"] = "0101"
+	hexMap["6"] = "0110"
+	hexMap["7"] = "0111"
+	hexMap["8"] = "1000"
+	hexMap["9"] = "1001"
+	hexMap["A"] = "1010"
+	hexMap["B"] = "1011"
+	hexMap["C"] = "1100"
+	hexMap["D"] = "1101"
+	hexMap["E"] = "1110"
+	hexMap["F"] = "1111"
+
+	for _, hex := range *hexString {
+		binary = binary + hexMap[string(hex)]
+	}
+
+	return
+
+}