updated template to use updated input

Day01/optimized.go

@@ -1,61 +1,77 @@
 package main
 
 import (
-	"encoding/json"
+	"bufio"
 	"fmt"
 	"log"
 	"os"
 	"sort"
+	"strconv"
+	"strings"
 )
 
 func optimized() {
 	fmt.Println("Optimized Code by ChatGPT")
 
-	// Read the file in one step
-	content, err := os.ReadFile("./input.json")
+	// Open the input file
+	file, err := os.Open("./input.txt")
 	if err != nil {
-		log.Fatalf("Error when opening input.json: %v", err)
+		log.Fatalf("Error opening input.txt: %v", err)
+	}
+	defer file.Close()
+
+	var (
+		listA, listB []int
+	)
+
+	// Read and parse input file
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := strings.Fields(scanner.Text())
+		if len(line) != 2 {
+			log.Fatalf("Invalid input format: %s", scanner.Text())
+		}
+		num1, err1 := strconv.Atoi(line[0])
+		num2, err2 := strconv.Atoi(line[1])
+		if err1 != nil || err2 != nil {
+			log.Fatalf("Error converting input to integers: %v, %v", err1, err2)
+		}
+		listA = append(listA, num1)
+		listB = append(listB, num2)
 	}
 
-	// Parse the JSON
-	var payload struct {
-		ListA []int `json:"list_a"`
-		ListB []int `json:"list_b"`
-	}
-	if err := json.Unmarshal(content, &payload); err != nil {
-		log.Fatalf("Error when unmarshalling input.json: %v", err)
+	if err := scanner.Err(); err != nil {
+		log.Fatalf("Error reading file: %v", err)
 	}
 
-	// Part 1: Calculate the sum of absolute differences between sorted lists
-	sort.Ints(payload.ListA)
-	sort.Ints(payload.ListB)
+	// Part 1: Calculate sum of absolute differences
+	sort.Ints(listA)
+	sort.Ints(listB)
 
 	sumPart1 := 0
-	for i := range payload.ListA {
-		sumPart1 += abs(payload.ListA[i] - payload.ListB[i])
+	for i := 0; i < len(listA); i++ {
+		diff := listA[i] - listB[i]
+		if diff < 0 {
+			diff = -diff
+		}
+		sumPart1 += diff
 	}
 	fmt.Printf("Sum of Part 1: %d\n", sumPart1)
 
-	// Part 2: Calculate weighted sum of common elements
+	// Part 2: Calculate weighted sum of matches
 	sumPart2 := 0
 	countMap := make(map[int]int)
-	for _, v := range payload.ListB {
-		countMap[v]++
+
+	// Populate a map for quick lookup
+	for _, num := range listB {
+		countMap[num]++
 	}
 
-	for _, v := range payload.ListA {
-		if countMap[v] > 0 {
-			sumPart2 += v * countMap[v]
-			countMap[v] = 0 // Avoid double-counting
+	for _, num := range listA {
+		if count, found := countMap[num]; found {
+			sumPart2 += count * num
 		}
 	}
+
 	fmt.Printf("Sum of Part 2: %d\n", sumPart2)
 }
-
-// Helper function for absolute value
-func abs(x int) int {
-	if x < 0 {
-		return -x
-	}
-	return x
-}

Day01/original.go

@@ -1,31 +1,41 @@
 package main
 
 import (
-	"encoding/json"
+	"bufio"
 	"fmt"
-	"io/ioutil"
 	"log"
+	"os"
 	"sort"
+	"strconv"
+	"strings"
 )
 
 func original() {
 	fmt.Println("Original Code")
 
-	content, err := ioutil.ReadFile("./input.json")
+	file, err := os.Open("./input.txt")
 	if err != nil {
 		log.Fatal("Error when opening input.json: ", err)
 	}
 
-	var payload map[string][]int
-	err = json.Unmarshal(content, &payload)
-	if err != nil {
-		log.Fatal("Error when unmarshalling input.json: ", err)
+	fileScanner := bufio.NewScanner(file)
+	fileScanner.Split(bufio.ScanLines)
+
+	var (
+		listA, listB []int
+	)
+
+	for fileScanner.Scan() {
+		slice := strings.Fields(fileScanner.Text())
+		num1, _ := strconv.Atoi(slice[0])
+		num2, _ := strconv.Atoi(slice[1])
+		listA = append(listA, num1)
+		listB = append(listB, num2)
 	}
 
-	// Part 1
-	listA := payload["list_a"]
-	listB := payload["list_b"]
+	file.Close()
 
+	// Part 1
 	sort.Ints(listA)
 	sort.Ints(listB)
 
@@ -41,9 +51,6 @@ func original() {
 	fmt.Println("Sum of Part 1: ", sumPart1)
 
 	// Part 2
-	listA = payload["list_a"]
-	listB = payload["list_b"]
-
 	sumPart2 := 0
 
 	for _, v1 := range listA {

template/original.go

@@ -1,7 +1,30 @@
 package main
 
-import "fmt"
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
 
 func original() {
 	fmt.Println("Original Code")
+
+	// Open the input file
+	file, err := os.Open("./input.txt")
+	if err != nil {
+		log.Fatalf("Error opening input.txt: %v", err)
+	}
+	defer file.Close()
+
+	// Read and parse input file
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := strings.Fields(scanner.Text())
+		if len(line) != 2 {
+			log.Fatalf("Invalid input format: %s", scanner.Text())
+		}
+		//
+	}
 }