Merge tag 'v0.6.4' into develop

覆盖率vbt vbt IndexRange heap的大量修改

priority_queue/vbt.go

@@ -1,8 +1,9 @@
 package pqueue
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
 )
 
 type Node struct {
@@ -100,9 +101,9 @@ func (tree *vbTree) IndexRange(idx1, idx2 int) (result []interface{}, ok bool) {
 
 	if idx1^idx2 < 0 {
 		if idx1 < 0 {
-			idx1 = tree.root.size + idx1 - 1
+			idx1 = tree.root.size + idx1
 		} else {
-			idx2 = tree.root.size + idx2 - 1
+			idx2 = tree.root.size + idx2
 		}
 	}
 

priority_queuekey/vbt.go

@@ -1,8 +1,9 @@
 package pqueuekey
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
 )
 
 type Node struct {
@@ -101,9 +102,9 @@ func (tree *vbTree) IndexRange(idx1, idx2 int) (result []interface{}, ok bool) {
 
 	if idx1^idx2 < 0 {
 		if idx1 < 0 {
-			idx1 = tree.root.size + idx1 - 1
+			idx1 = tree.root.size + idx1
 		} else {
-			idx2 = tree.root.size + idx2 - 1
+			idx2 = tree.root.size + idx2
 		}
 	}
 

tree/avl/avl.go

@@ -1,8 +1,10 @@
 package avl
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -31,6 +33,10 @@ type Tree struct {
 	iter    *Iterator
 }
 
+func assertImplementation() {
+	var _ tree.IBSTree = (*Tree)(nil)
+}
+
 func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }

tree/avldup/avldup.go

@@ -1,8 +1,10 @@
 package avldup
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -32,6 +34,10 @@ type Tree struct {
 	iter *Iterator
 }
 
+func assertImplementation() {
+	var _ tree.IBSTree = (*Tree)(nil)
+}
+
 func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }

tree/avlkey/avlkey.go

@@ -1,8 +1,10 @@
 package avlkey
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -35,6 +37,10 @@ func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }
 
+func assertImplementation() {
+	var _ tree.IBSTreeKey = (*Tree)(nil)
+}
+
 func (tree *Tree) String() string {
 	if tree.size == 0 {
 		return ""

tree/avlkeydup/avlkeydup.go

@@ -1,8 +1,10 @@
 package avlkeydup
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -31,6 +33,10 @@ type Tree struct {
 	iter    *Iterator
 }
 
+func assertImplementation() {
+	var _ tree.IBSTreeKey = (*Tree)(nil)
+}
+
 func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }

tree/heap/heap.go

@@ -54,7 +54,7 @@ func (h *Heap) Top() (interface{}, bool) {
 	return nil, false
 }
 
-func (h *Heap) Push(v interface{}) {
+func (h *Heap) Put(v interface{}) {
 	if v == nil {
 		return
 	}
@@ -110,40 +110,28 @@ func (h *Heap) Pop() (interface{}, bool) {
 
 	downvalue := h.elements[h.size]
 	var cidx, c1, c2 int
-	var cvalue1, cvalue2, cvalue interface{}
 	// down
 	for {
 		cidx = curidx << 1
 
+		c1 = cidx + 1
 		c2 = cidx + 2
+
 		if c2 < h.size {
-			cvalue2 = h.elements[c2]
-
-			c1 = cidx + 1
-			cvalue1 = h.elements[c1]
-
-			if h.Compare(cvalue1, cvalue2) >= 0 {
+			if h.Compare(h.elements[c1], h.elements[c2]) >= 0 {
 				cidx = c1
-				cvalue = cvalue1
 			} else {
 				cidx = c2
-				cvalue = cvalue2
 			}
 		} else {
-
-			c1 = cidx + 1
-			if c1 < h.size {
-				cvalue1 = h.elements[c1]
-				cidx = c1
-				cvalue = cvalue1
-			} else {
+			cidx = c1
+			if c1 >= h.size {
 				break
 			}
-
 		}
 
-		if h.Compare(cvalue, downvalue) > 0 {
-			h.elements[curidx] = cvalue
+		if h.Compare(h.elements[cidx], downvalue) > 0 {
+			h.elements[curidx] = h.elements[cidx]
 			curidx = cidx
 		} else {
 			break

tree/heap/heap_test.go

@@ -1,17 +1,70 @@
 package heap
 
 import (
+	"sort"
 	"testing"
 
 	"github.com/474420502/focus/compare"
+	"github.com/Pallinder/go-randomdata"
 )
 
+func TestHeapGrowSlimming(t *testing.T) {
+
+	for ii := 0; ii < 1000; ii++ {
+
+		h := New(compare.Int)
+		var results []int
+		for i := 0; i < 100; i++ {
+			v := randomdata.Number(0, 100)
+			results = append(results, v)
+			h.Put(v)
+		}
+		sort.Slice(results, func(i, j int) bool {
+			if results[i] > results[j] {
+				return true
+			}
+			return false
+		})
+
+		if h.Size() != 100 || h.Empty() {
+			t.Error("size != 100")
+		}
+
+		for i := 0; !h.Empty(); i++ {
+			v, _ := h.Pop()
+			if results[i] != v {
+				t.Error("heap is error")
+			}
+		}
+
+		if h.Size() != 0 {
+			t.Error("size != 0")
+		}
+
+		h.Put(1)
+		h.Put(5)
+		h.Put(2)
+
+		if h.Values()[0] != 5 {
+			t.Error("top is not equal to 5")
+		}
+
+		h.Clear()
+		h.Reborn()
+
+		if !h.Empty() {
+			t.Error("clear reborn is error")
+		}
+	}
+
+}
+
 func TestHeapPushTopPop(t *testing.T) {
 	h := New(compare.Int)
 	l := []int{9, 5, 15, 2, 3}
 	ol := []int{15, 9, 5, 3, 2}
 	for _, v := range l {
-		h.Push(v)
+		h.Put(v)
 	}
 
 	for _, tv := range ol {
@@ -31,8 +84,44 @@ func TestHeapPushTopPop(t *testing.T) {
 	if h.Size() != 0 {
 		t.Error("heap size is not equals to zero")
 	}
+
+	h.Clear()
+
+	l = []int{3, 5, 2, 7, 1}
+
+	for _, v := range l {
+		h.Put(v)
+	}
+
+	sort.Slice(l, func(i, j int) bool {
+		if l[i] > l[j] {
+			return true
+		}
+		return false
+	})
+
+	for i := 0; !h.Empty(); i++ {
+		v, _ := h.Pop()
+		if l[i] != v {
+			t.Error("heap is error")
+		}
+	}
 }
 
+// func BenchmarkPush(b *testing.B) {
+// 	h := New(compare.Int)
+// 	b.N = 40000000
+// 	var results []int
+// 	for i := 0; i < b.N; i++ {
+// 		results = append(results, randomdata.Number(0, 1000000000))
+// 	}
+
+// 	b.ResetTimer()
+// 	for _, v := range results {
+// 		h.Put(v)
+// 	}
+// }
+
 // func Int(k1, k2 interface{}) int {
 // 	c1 := k1.(int)
 // 	c2 := k2.(int)

tree/tree.go

@@ -0,0 +1,27 @@
+package tree
+
+// IBSTreeKey Compare函数可以自定义所以key不一定value, 可以是value结构体中一个属性
+type IBSTreeKey interface {
+	String() string
+	Size() int
+	Remove(key interface{}) (interface{}, bool)
+	Clear()
+	// Values 返回先序遍历的值
+	Values() []interface{}
+	Get(key interface{}) (interface{}, bool)
+	Put(key, value interface{})
+	Traversal(every func(k, v interface{}) bool, traversalMethod ...interface{})
+}
+
+// IBSTree
+type IBSTree interface {
+	String() string
+	Size() int
+	Remove(key interface{}) (interface{}, bool)
+	Clear()
+	// Values 返回先序遍历的值
+	Values() []interface{}
+	Get(key interface{}) (interface{}, bool)
+	Put(value interface{})
+	Traversal(every func(v interface{}) bool, traversalMethod ...interface{})
+}

tree/vbt/vbt.go

@@ -1,8 +1,10 @@
 package vbt
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -31,6 +33,10 @@ type Tree struct {
 	iter *Iterator
 }
 
+func assertImplementation() {
+	var _ tree.IBSTree = (*Tree)(nil)
+}
+
 func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }
@@ -98,9 +104,9 @@ func (tree *Tree) IndexRange(idx1, idx2 int) (result []interface{}, ok bool) { /
 
 	if idx1^idx2 < 0 {
 		if idx1 < 0 {
-			idx1 = tree.root.size + idx1 - 1
+			idx1 = tree.root.size + idx1
 		} else {
-			idx2 = tree.root.size + idx2 - 1
+			idx2 = tree.root.size + idx2
 		}
 	}
 
@@ -231,6 +237,11 @@ func (tree *Tree) Remove(key interface{}) (interface{}, bool) {
 	return nil, false
 }
 
+func (tree *Tree) Clear() {
+	tree.root = nil
+	tree.iter = NewIteratorWithCap(nil, 16)
+}
+
 // Values 返回先序遍历的值
 func (tree *Tree) Values() []interface{} {
 	mszie := 0

tree/vbt/vbt_test.go

@@ -5,11 +5,13 @@ import (
 	"encoding/gob"
 	"io/ioutil"
 	"log"
+	"sort"
 	"testing"
 
-	"github.com/474420502/focus/compare"
-
+	"github.com/Pallinder/go-randomdata"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
 )
 
 func loadTestData() []int {
@@ -23,6 +25,98 @@ func loadTestData() []int {
 	return l
 }
 
+func TestLargePushRemove(t *testing.T) {
+	for n := 0; n < 10; n++ {
+		tree := New(compare.Int)
+		var results []int
+		for i := 0; i < 50000; i++ {
+			v := randomdata.Number(0, 100000000)
+			tree.Put(v)
+			results = append(results, v)
+		}
+		if tree.Size() != 50000 {
+			t.Error("Szie error")
+		}
+		for i := 0; i < 49990; i++ {
+			tree.Remove(results[i])
+		}
+		results = results[49990:]
+		if tree.Size() != 10 {
+			t.Error("Szie error")
+		}
+		sort.Slice(results, func(i, j int) bool {
+			if results[i] < results[j] {
+				return true
+			}
+			return false
+		})
+		if spew.Sprint(results) != spew.Sprint(tree.Values()) {
+			t.Error("tree is error")
+		}
+
+		for i := 0; i < 10; i++ {
+			v1 := results[i]
+			v2, ok := tree.Index(i)
+			if !ok {
+				t.Error("not ok")
+			}
+			if v1 != v2 {
+				t.Error("v1(", v1, ") != v2(", v2, ")??")
+			}
+		}
+
+		tree.Clear()
+		if tree.String() != "AVLTree\nnil" {
+			t.Error("tree String is error")
+		}
+	}
+}
+
+func TestRemoveIndex(t *testing.T) {
+	tree := New(compare.Int)
+	l := []int{7, 14, 14, 14, 16, 1, 40, 15}
+	for _, v := range l {
+		tree.Put(v)
+	}
+
+	// [1 7 14 14 14 15 16 40]
+	var result string
+	result = spew.Sprint(tree.Values())
+	if result != "[1 7 14 14 14 15 16 40]" {
+		t.Error("result = ", result, " should be [1 7 14 14 14 15 16 40]")
+	}
+
+	tree.RemoveIndex(3)
+	result = spew.Sprint(tree.Values())
+	if result != "[1 7 14 14 15 16 40]" {
+		t.Error("result is error")
+	}
+
+	tree.RemoveIndex(-1)
+	result = spew.Sprint(tree.Values())
+	if result != "[1 7 14 14 15 16]" {
+		t.Error("result is error")
+	}
+
+	tree.RemoveIndex(0)
+	result = spew.Sprint(tree.Values())
+	if result != "[7 14 14 15 16]" {
+		t.Error("result is error")
+	}
+
+	if tree.Size() != 5 {
+		t.Error("size is error")
+	}
+
+	for tree.Size() != 0 {
+		tree.RemoveIndex(0)
+	}
+
+	if tree.root != nil {
+		t.Error("tree roor is not error")
+	}
+}
+
 func TestIndexRange(t *testing.T) {
 	tree := New(compare.Int)
 	l := []int{7, 14, 14, 14, 16, 17, 20, 30, 21, 40, 50, 3, 40, 40, 40, 15}
@@ -82,6 +176,22 @@ func TestIndexRange(t *testing.T) {
 	if result != "[40 40 40 40 50] true" {
 		t.Error(result)
 	}
+
+	// [3 7 14 14 14 15 16 17 20 21 30 40 40 40 40 50]
+	result = spew.Sprint(tree.IndexRange(-5, 10)) //
+	if result != "[40 30] true" {
+		t.Error(result)
+	}
+
+	result = spew.Sprint(tree.IndexRange(10, -5)) //
+	if result != "[30 40] true" {
+		t.Error(result)
+	}
+
+	result = spew.Sprint(tree.IndexRange(-1, 8)) //
+	if result != "[50 40 40 40 40 30 21 20] true" {
+		t.Error(result)
+	}
 }
 
 func TestGetAround(t *testing.T) {

tree/vbtkey/iterator.go

@@ -1,7 +1,7 @@
 package vbtkey
 
 import (
-	"github.com/474420502/focus/stack/listarraystack"
+	lastack "github.com/474420502/focus/stack/listarraystack"
 )
 
 type Iterator struct {
@@ -148,7 +148,7 @@ func (iter *Iterator) Prev() (result bool) {
 	if iter.dir < 1 { // 非 1(next 方向定义 -1 为 prev)
 		if iter.dir == -1 && iter.cur != nil { // 如果上次为prev方向, 则清空辅助计算的栈
 			iter.tstack.Clear()
-			iter.curPushPrevStack(iter.cur)    // 把当前cur计算的逆向回朔
+			iter.curPushPrevStack(iter.cur)    // 把当前cur计算的回朔
 			iter.up = iter.getPrevUp(iter.cur) // cur 寻找下个要计算up
 		}
 		iter.dir = 1

tree/vbtkey/vbtkey.go

@@ -1,8 +1,10 @@
 package vbtkey
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -32,6 +34,10 @@ type Tree struct {
 	iter *Iterator
 }
 
+func assertImplementation() {
+	var _ tree.IBSTreeKey = (*Tree)(nil)
+}
+
 func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }
@@ -99,9 +105,9 @@ func (tree *Tree) IndexRange(idx1, idx2 int) (result []interface{}, ok bool) { /
 
 	if idx1^idx2 < 0 {
 		if idx1 < 0 {
-			idx1 = tree.root.size + idx1 - 1
+			idx1 = tree.root.size + idx1
 		} else {
-			idx2 = tree.root.size + idx2 - 1
+			idx2 = tree.root.size + idx2
 		}
 	}
 
@@ -232,6 +238,11 @@ func (tree *Tree) Remove(key interface{}) (interface{}, bool) {
 	return nil, false
 }
 
+func (tree *Tree) Clear() {
+	tree.root = nil
+	tree.iter = NewIteratorWithCap(nil, 16)
+}
+
 // Values 返回先序遍历的值
 func (tree *Tree) Values() []interface{} {
 	mszie := 0
@@ -239,7 +250,7 @@ func (tree *Tree) Values() []interface{} {
 		mszie = tree.root.size
 	}
 	result := make([]interface{}, 0, mszie)
-	tree.Traversal(func(v interface{}) bool {
+	tree.Traversal(func(k, v interface{}) bool {
 		result = append(result, v)
 		return true
 	}, LDR)
@@ -500,8 +511,8 @@ const (
 	RLD
 )
 
-// Traversal 遍历的方法 默认是LDR 从小到大 comparator 为 l < r
-func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...interface{}) {
+// Traversal 遍历的方法 默认是LDR 从小到大 Compare 为 l < r
+func (tree *Tree) Traversal(every func(k, v interface{}) bool, traversalMethod ...interface{}) {
 	if tree.root == nil {
 		return
 	}
@@ -518,7 +529,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if cur == nil {
 				return true
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			if !traverasl(cur.children[0]) {
@@ -539,7 +550,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if !traverasl(cur.children[0]) {
 				return false
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			if !traverasl(cur.children[1]) {
@@ -560,7 +571,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if !traverasl(cur.children[1]) {
 				return false
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			return true
@@ -572,7 +583,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if cur == nil {
 				return true
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			if !traverasl(cur.children[0]) {
@@ -593,7 +604,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if !traverasl(cur.children[1]) {
 				return false
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			if !traverasl(cur.children[0]) {
@@ -614,7 +625,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if !traverasl(cur.children[0]) {
 				return false
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			return true

tree/vbtkey/vbtkey_test.go

@@ -5,11 +5,13 @@ import (
 	"encoding/gob"
 	"io/ioutil"
 	"log"
+	"sort"
 	"testing"
 
-	"github.com/474420502/focus/compare"
-
+	"github.com/Pallinder/go-randomdata"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
 )
 
 func loadTestData() []int {
@@ -23,6 +25,98 @@ func loadTestData() []int {
 	return l
 }
 
+func TestLargePushRemove(t *testing.T) {
+	for n := 0; n < 10; n++ {
+		tree := New(compare.Int)
+		var results []int
+		for i := 0; i < 50000; i++ {
+			v := randomdata.Number(0, 100000000)
+			tree.Put(v, v)
+			results = append(results, v)
+		}
+		if tree.Size() != 50000 {
+			t.Error("Szie error")
+		}
+		for i := 0; i < 49990; i++ {
+			tree.Remove(results[i])
+		}
+		results = results[49990:]
+		if tree.Size() != 10 {
+			t.Error("Szie error")
+		}
+		sort.Slice(results, func(i, j int) bool {
+			if results[i] < results[j] {
+				return true
+			}
+			return false
+		})
+		if spew.Sprint(results) != spew.Sprint(tree.Values()) {
+			t.Error("tree is error")
+		}
+
+		for i := 0; i < 10; i++ {
+			v1 := results[i]
+			v2, ok := tree.Index(i)
+			if !ok {
+				t.Error("not ok")
+			}
+			if v1 != v2 {
+				t.Error("v1(", v1, ") != v2(", v2, ")??")
+			}
+		}
+
+		tree.Clear()
+		if tree.String() != "AVLTree\nnil" {
+			t.Error("tree String is error")
+		}
+	}
+}
+
+func TestRemoveIndex(t *testing.T) {
+	tree := New(compare.Int)
+	l := []int{7, 14, 14, 14, 16, 1, 40, 15}
+	for _, v := range l {
+		tree.Put(v, v)
+	}
+
+	// [1 7 14 14 14 15 16 40]
+	var result string
+	result = spew.Sprint(tree.Values())
+	if result != "[1 7 14 14 14 15 16 40]" {
+		t.Error("result = ", result, " should be [1 7 14 14 14 15 16 40]")
+	}
+
+	tree.RemoveIndex(3)
+	result = spew.Sprint(tree.Values())
+	if result != "[1 7 14 14 15 16 40]" {
+		t.Error("result is error")
+	}
+
+	tree.RemoveIndex(-1)
+	result = spew.Sprint(tree.Values())
+	if result != "[1 7 14 14 15 16]" {
+		t.Error("result is error")
+	}
+
+	tree.RemoveIndex(0)
+	result = spew.Sprint(tree.Values())
+	if result != "[7 14 14 15 16]" {
+		t.Error("result is error")
+	}
+
+	if tree.Size() != 5 {
+		t.Error("size is error")
+	}
+
+	for tree.Size() != 0 {
+		tree.RemoveIndex(0)
+	}
+
+	if tree.root != nil {
+		t.Error("tree roor is not error")
+	}
+}
+
 func TestIndexRange(t *testing.T) {
 	tree := New(compare.Int)
 	l := []int{7, 14, 14, 14, 16, 17, 20, 30, 21, 40, 50, 3, 40, 40, 40, 15}
@@ -82,6 +176,23 @@ func TestIndexRange(t *testing.T) {
 	if result != "[40 40 40 40 50] true" {
 		t.Error(result)
 	}
+
+	// [3 7 14 14 14 15 16 17 20 21 30 40 40 40 40 50]
+	result = spew.Sprint(tree.IndexRange(-5, 10)) //
+	if result != "[40 30] true" {
+		t.Error(result)
+	}
+
+	result = spew.Sprint(tree.IndexRange(10, -5)) //
+	if result != "[30 40] true" {
+		t.Error(result)
+	}
+
+	result = spew.Sprint(tree.IndexRange(-1, 8)) //
+	if result != "[50 40 40 40 40 30 21 20] true" {
+		t.Error(result)
+	}
+
 }
 
 func TestGetAround(t *testing.T) {
@@ -265,8 +376,8 @@ func TestTravalsal(t *testing.T) {
 
 	i := 0
 	var result []interface{}
-	tree.Traversal(func(v interface{}) bool {
-		result = append(result, v)
+	tree.Traversal(func(k, v interface{}) bool {
+		result = append(result, k)
 		i++
 		if i >= 10 {
 			return false