1 files changed, 4 insertions, 1 deletions
diff --git a/sort/sleep.go b/sort/sleep.go
index 3ca45b2..146ff3a 100644
--- a/sort/sleep.go
+++ b/sort/sleep.go
@@ -7,7 +7,10 @@ import (
 )
 
 func Sleep[V ds.Integer](a ds.ArrayList[V]) ds.ArrayList[V] {
-	sorted := ds.NewArrayList[V](len(a))
+	// Start empty with capacity len(a): the received values are appended below.
+	// NewArrayList(len(a)) would create a slice of that *length* (all zeros) and
+	// the appends would then produce len(a) spurious leading zeros.
+	sorted := make(ds.ArrayList[V], 0, len(a))
 
 	numCh := make(chan V)
 	var wg sync.WaitGroup