update day1

rewrite all functions to methods

2024/01/main.go

@@ -6,39 +6,43 @@ import (
 	"sort"
 )
 
-var list_a, list_b []int
+type list struct {
+	a []int
+	b []int
+}
 
 func main() {
-	list_a, list_b = helper.ReadLinesTwoIntSlices()
+	list_a, list_b := helper.ReadLinesTwoIntSlices()
+	list := list{a: list_a, b: list_b}
 
 	// part 1
-	distance := list_distance(list_a, list_b)
+	distance := list.distance()
 	fmt.Printf("Distance: %v\n", distance)
 
 	// part 2
-	similarity := list_similarity(list_a, list_b)
+	similarity := list.similarity()
 	fmt.Printf("Similarity: %v\n", similarity)
 }
 
-func list_distance(list_a []int, list_b []int) (dist int) {
+func (l list) distance() (dist int) {
-	sort.Ints(list_a)
+	sort.Ints(l.a)
-	sort.Ints(list_b)
+	sort.Ints(l.b)
 
-	for i := range list_a {
+	for i := range l.a {
-		dist += helper.Abs(list_a[i] - list_b[i])
+		dist += helper.Abs(l.a[i] - l.b[i])
 	}
 	return dist
 }
 
-func list_similarity(list_a []int, list_b []int) (sim int) {
+func (l list) similarity() (sim int) {
-	for _, val := range list_a {
+	for _, val := range l.a {
-		valcount := countIntInList(list_b, val)
+		valcount := countIntInSlice(l.b, val)
 		sim += valcount * val
 	}
 	return sim
 }
 
-func countIntInList(lst []int, i int) (count int) {
+func countIntInSlice(lst []int, i int) (count int) {
 	for _, val := range lst {
 		if val == i {
 			count++