diff --git a/deque/deque.go b/deque/deque.go
index 073c269..b2b0a16 100644
--- a/deque/deque.go
+++ b/deque/deque.go
@@ -89,7 +89,9 @@ func (c *Deque[T]) Reset() {
 func (c *Deque[T]) autoReset() {
 	c.head, c.tail, c.length = Nil, Nil, 0
 	c.stack = c.stack[:0]
-	c.elements = c.elements[:1]
+	if len(c.elements) > 0 {
+		c.elements = c.elements[:1]
+	}
 }
 
 func (c *Deque[T]) Len() int {
@@ -276,11 +278,13 @@ func (c *Deque[T]) doRemove(ele *Element[T]) {
 	}
 }
 
-func (c *Deque[T]) Range(f func(ele *Element[T]) bool) {
-	for i := c.Get(c.head); i != nil; i = c.Get(i.next) {
-		if !f(i) {
+func (c *Deque[T]) Range(f func(index int, ele *Element[T]) bool) {
+	var index = 0
+	for iter := c.Get(c.head); iter != nil; iter = c.Get(iter.next) {
+		if !f(index, iter) {
 			break
 		}
+		index++
 	}
 }
 
diff --git a/deque/deque_test.go b/deque/deque_test.go
index da3cf1b..d1975b9 100644
--- a/deque/deque_test.go
+++ b/deque/deque_test.go
@@ -82,7 +82,7 @@ func TestQueue_Range(t *testing.T) {
 		assert.Equal(t, q.Len(), count)
 
 		var b []int
-		q.Range(func(ele *Element[int]) bool {
+		q.Range(func(index int, ele *Element[int]) bool {
 			b = append(b, ele.Value())
 			return len(b) < 100
 		})
@@ -165,7 +165,7 @@ func TestQueue_Pop(t *testing.T) {
 	q.PopFront()
 
 	var arr []int
-	q.Range(func(ele *Element[int]) bool {
+	q.Range(func(index int, ele *Element[int]) bool {
 		arr = append(arr, ele.Value())
 		return true
 	})
@@ -189,7 +189,7 @@ func TestDeque_InsertAfter(t *testing.T) {
 		q.InsertAfter(3, node.Addr())
 
 		var arr []int
-		q.Range(func(ele *Element[int]) bool {
+		q.Range(func(index int, ele *Element[int]) bool {
 			arr = append(arr, ele.Value())
 			return true
 		})
@@ -206,7 +206,7 @@ func TestDeque_InsertAfter(t *testing.T) {
 		q.InsertAfter(3, node.Addr())
 
 		var arr []int
-		q.Range(func(ele *Element[int]) bool {
+		q.Range(func(index int, ele *Element[int]) bool {
 			arr = append(arr, ele.Value())
 			return true
 		})
@@ -229,7 +229,7 @@ func TestDeque_InsertBefore(t *testing.T) {
 		q.InsertBefore(3, node.Addr())
 
 		var arr []int
-		q.Range(func(ele *Element[int]) bool {
+		q.Range(func(index int, ele *Element[int]) bool {
 			arr = append(arr, ele.Value())
 			return true
 		})
@@ -246,7 +246,7 @@ func TestDeque_InsertBefore(t *testing.T) {
 		q.InsertBefore(3, node.Addr())
 
 		var arr []int
-		q.Range(func(ele *Element[int]) bool {
+		q.Range(func(index int, ele *Element[int]) bool {
 			arr = append(arr, ele.Value())
 			return true
 		})
@@ -271,7 +271,7 @@ func TestDeque_Delete(t *testing.T) {
 		q.Remove(node.Addr())
 
 		var arr []int
-		q.Range(func(ele *Element[int]) bool {
+		q.Range(func(index int, ele *Element[int]) bool {
 			arr = append(arr, ele.Value())
 			return true
 		})
@@ -287,7 +287,7 @@ func TestDeque_Delete(t *testing.T) {
 		q.Remove(node.Addr())
 
 		var arr []int
-		q.Range(func(ele *Element[int]) bool {
+		q.Range(func(index int, ele *Element[int]) bool {
 			arr = append(arr, ele.Value())
 			return true
 		})
@@ -303,7 +303,7 @@ func TestDeque_Delete(t *testing.T) {
 		q.Remove(node.Addr())
 
 		var arr []int
-		q.Range(func(ele *Element[int]) bool {
+		q.Range(func(index int, ele *Element[int]) bool {
 			arr = append(arr, ele.Value())
 			return true
 		})
diff --git a/heap/hash.go b/heap/hash.go
index 9556dca..21caedd 100644
--- a/heap/hash.go
+++ b/heap/hash.go
@@ -153,8 +153,16 @@ func (c *underlyingHeap[K, V]) down(i, n int) {
 }
 
 func (c *underlyingHeap[K, V]) Update(ele *Element[K, V], value V) {
-	var down = c.lessFunc(ele.value, value)
 	ele.value = value
+	var down bool
+	if ele.index == 0 {
+		down = true
+	} else {
+		var i = ele.index >> 2
+		var p = c.data[i]
+		down = c.lessFunc(p.value, ele.value)
+	}
+
 	if down {
 		c.down(ele.index, c.Len())
 	} else {