shorten go code for aoc2024 day 1

go/cmd/part1/main.go

@@ -4,14 +4,14 @@ import (
 	"bufio"
 	"fmt"
 	"os"
-	"slices"
+	"sort"
 	"strconv"
 	"strings"
 )
 
 func main() {
-  left := []int64{};
-  right := []int64{};
+  left := []int{};
+  right := []int{};
   reader := bufio.NewReader(os.Stdin)
 
   for {
@@ -23,8 +23,8 @@ func main() {
 
     values := strings.Split(line, "   ")
 
-    l, _ := strconv.ParseInt(values[0], 10, 64)
-    r, _ := strconv.ParseInt(values[1], 10, 64)
+    l, _ := strconv.Atoi(values[0])
+    r, _ := strconv.Atoi(values[1])
 
     left = append(left, l)
     right = append(right, r)
@@ -35,13 +35,11 @@ func main() {
   fmt.Println("", ans)
 }
 
-func part1(left *[]int64, right *[]int64) int64 {
-  slices.SortFunc(*left, func (a, b int64) int { return int(a - b); });
-  slices.SortFunc(*right, func (a, b int64) int { return int(a - b); });
-
-  var sum int64 = 0
-
+func part1(left *[]int, right *[]int) int {
+  sort.Ints(*left);
+  sort.Ints(*right);
   sz := len(*left)
+  sum := 0
 
   for i := 0; i < sz; i++ {
     diff := (*left)[i] - (*right)[i]

go/cmd/part2/main.go

@@ -9,21 +9,22 @@ import (
 )
 
 func main() {
-  left := map[int64]int64{};
-  right := map[int64]int64{};
+  left := map[int]int{};
+  right := map[int]int{};
   reader := bufio.NewReader(os.Stdin)
 
   for {
     raw, _, _ := reader.ReadLine()
     line := string(raw)
+
     if strings.Trim(line, " ") == "" {
       break
     }
 
     values := strings.Split(line, "   ")
 
-    l, _ := strconv.ParseInt(values[0], 10, 64)
-    r, _ := strconv.ParseInt(values[1], 10, 64)
+    l, _ := strconv.Atoi(values[0])
+    r, _ := strconv.Atoi(values[1])
 
     left[l] = left[l] + 1
     right[r] = right[r] + 1
@@ -34,8 +35,8 @@ func main() {
   fmt.Println("", ans)
 }
 
-func part2(left map[int64]int64, right map[int64]int64) int64 {
-  var sum int64 = 0
+func part2(left map[int]int, right map[int]int) int {
+  sum := 0
 
   for key, l_count := range left {
     count := right[key]