new file: .gitignore

new file:   LICENSE
new file:   README.md
new file:   compare/compare.go
new file:   for_test.go
new file:   heap/heap.go
new file:   heap/heap_test.go
new file:   interface.go
new file:   lastack/lastack.go
new file:   lastack/lastack_test.go
new file:   list/list.go
new file:   list/list_test.go
new file:   map/hashmap/hashmap.go
new file:   map/hashmap/hashmap_test.go
new file:   priority_list/iterator.go
new file:   priority_list/priority_list.go
new file:   priority_list/priority_list_test.go
new file:   priority_queue/iterator.go
new file:   priority_queue/priority_queue.go
new file:   priority_queue/priority_queue_test.go
new file:   priority_queue/vbt.go
new file:   priority_queue/vbt_test.go
new file:   priority_queuekey/iterator.go
new file:   priority_queuekey/priority_queuekey.go
new file:   priority_queuekey/priority_queuekey_test.go
new file:   priority_queuekey/vbt.go
new file:   priority_queuekey/vbt_test.go
new file:   set/hashset/hashset.go
new file:   set/hashset/hashset_test.go
new file:   set/treeset/treeset.go
new file:   set/treeset/treeset_test.go
new file:   sparse_array/array2/array2.go
new file:   sparse_array/array2/array2_test.go
new file:   sparse_array/array3/array3.go
new file:   sparse_array/array3/array3_test.go
new file:   sparse_array/arrayn/arrayn.go
new file:   sparse_array/arrayn/arrayn_test.go
new file:   stack/stack.go
new file:   stack/stack_test.go
new file:   tree/avl/avl.go
new file:   tree/avl/avl_test.go
new file:   tree/avl/iterator.go
new file:   tree/avldup/avldup.go
new file:   tree/avldup/avldup_test.go
new file:   tree/avldup/iterator.go
new file:   tree/avlkey/avlkey.go
new file:   tree/avlkey/avlkey_test.go
new file:   tree/avlkey/iterator.go
new file:   tree/avlkeydup/avlkeydup.go
new file:   tree/avlkeydup/avlkeydup_test.go
new file:   tree/avlkeydup/iterator.go
new file:   tree/vbt/iterator.go
new file:   tree/vbt/vbt.go
new file:   tree/vbt/vbt_test.go
new file:   tree/vbtkey/iterator.go
new file:   tree/vbtkey/vbtkey.go
new file:   tree/vbtkey/vbtkey_test.go

set/treeset/treeset.go

@@ -0,0 +1,85 @@
+package treeset
+
+import (
+	"fmt"
+	"strings"
+
+	"474420502.top/eson/structure/avldup"
+	"474420502.top/eson/structure/compare"
+)
+
+// TreeSet
+type TreeSet struct {
+	tree *avldup.Tree
+}
+
+// New
+func New(Compare compare.Compare) *TreeSet {
+	return &TreeSet{tree: avldup.New(Compare)}
+}
+
+// Add
+func (set *TreeSet) Add(items ...interface{}) {
+	for _, item := range items {
+		set.tree.Put(item)
+	}
+}
+
+// Remove
+func (set *TreeSet) Remove(items ...interface{}) {
+	for _, item := range items {
+		set.tree.Remove(item)
+	}
+}
+
+// Values
+func (set *TreeSet) Values() []interface{} {
+	return set.tree.Values()
+}
+
+// Contains
+func (set *TreeSet) Contains(item interface{}) bool {
+	if _, ok := set.tree.Get(item); ok {
+		return true
+	}
+	return false
+}
+
+// Contains the result is [r1,r2], not [r1, r2)
+func (set *TreeSet) GetRange(r1, r2 interface{}) (result []interface{}) {
+	return set.tree.GetRange(r1, r2)
+}
+
+// Contains the result is [r1,item,r2] r1->item->r2 are close-knit
+func (set *TreeSet) GetAround(item interface{}) (result [3]interface{}) {
+	return set.tree.GetAround(item)
+}
+
+// Empty
+func (set *TreeSet) Empty() bool {
+	return set.Size() == 0
+}
+
+// Clear
+func (set *TreeSet) Clear() {
+	set.tree.Clear()
+}
+
+// Size
+func (set *TreeSet) Size() int {
+	return set.tree.Size()
+}
+
+// String
+func (set *TreeSet) String() string {
+	content := "HashSet\n"
+	items := []string{}
+
+	set.tree.Traversal(func(k interface{}) bool {
+		items = append(items, fmt.Sprintf("%v", k))
+		return true
+	})
+
+	content += strings.Join(items, ", ")
+	return content
+}

set/treeset/treeset_test.go

@@ -0,0 +1 @@
+package treeset