custom function to reverse slices

2024/day02.go

@@ -4,7 +4,6 @@ import (
 	"bufio"
 	"fmt"
 	"io"
-	"slices"
 	"strings"
 )
 
@@ -29,7 +28,7 @@ func (d Day2) Part1(r io.Reader) string {
 		if layerOk(level) {
 			sum++
 		} else {
-			slices.Reverse(level)
+			reverse(level)
 			if layerOk(level) {
 				sum++
 			}
@@ -58,7 +57,7 @@ func (d Day2) Part2(r io.Reader) string {
 		if layerOkWithDampen(level) {
 			sum++
 		} else {
-			slices.Reverse(level)
+			reverse(level)
 			if layerOkWithDampen(level) {
 				sum++
 			}

2024/iterator.go

@@ -0,0 +1,10 @@
+package adventoc2024
+
+func reverse(s []int) {
+	start, end := 0, len(s)-1
+	for start < end {
+		s[start], s[end] = s[end], s[start]
+		start++
+		end--
+	}
+}