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添加Index方法进

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This commit is contained in:
eson 2019-03-20 02:36:16 +08:00
parent 06d55a2f9e
commit cc2f390743
2 changed files with 51 additions and 50 deletions
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64
avlindex/avlindex.go
View File

@ -54,6 +54,37 @@ func (avl *Tree) Size() int {
return avl.root.size
}
func (avl *Tree) Index(idx int) (interface{}, bool) {
cur := avl.root
if idx >= 0 {
for cur != nil {
ls := getSize(cur.children[0])
if idx == ls {
return cur.value, true
} else if idx < ls {
cur = cur.children[0]
} else {
idx = idx - ls - 1
cur = cur.children[1]
}
}
} else {
idx = -idx - 1
for cur != nil {
rs := getSize(cur.children[1])
if idx == rs {
return cur.value, true
} else if idx < rs {
cur = cur.children[1]
} else {
idx = idx - rs - 1
cur = cur.children[0]
}
}
}
return nil, false
}
func (avl *Tree) Remove(key interface{}) *Node {
if n, ok := avl.GetNode(key); ok {
@ -135,39 +166,6 @@ func (avl *Tree) Get(key interface{}) (interface{}, bool) {
return n, false
}
func (avl *Tree) GetRange(min, max interface{}) []interface{} {
var minN *Node
for minN = avl.root; minN != nil; {
switch c := avl.comparator(min, minN.value); c {
case -1:
minN = minN.children[0]
case 1:
minN = minN.children[1]
case 0:
break
default:
panic("Get comparator only is allowed in -1, 0, 1")
}
}
var maxN *Node
for maxN = avl.root; maxN != nil; {
switch c := avl.comparator(min, maxN.value); c {
case -1:
maxN = maxN.children[0]
case 1:
maxN = maxN.children[1]
case 0:
break
default:
panic("Get comparator only is allowed in -1, 0, 1")
}
}
return nil
}
func (avl *Tree) GetAround(key interface{}) (result [3]interface{}) {
an := avl.GetAroundNode(key)
for i, n := range an {

37
avlindex/avlindex_test.go
View File

@ -18,7 +18,7 @@ import (
const CompartorSize = 1000000
const NumberMax = 50000000
func TestSave(t *testing.T) {
func Save(t *testing.T) {
f, err := os.OpenFile("../l.log", os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
if err != nil {
@ -63,12 +63,12 @@ func loadTestData() []int {
}
func TestIterator(t *testing.T) {
avl := New(utils.IntComparator)
for _, v := range []int{7, 14, 14, 14, 16, 17, 20, 30, 21, 40, 40, 50, 3, 40, 40, 40, 15} {
avl.Put(v)
}
t.Error(avl.Values())
t.Error(avl.debugString())
// avl := New(utils.IntComparator)
// for _, v := range []int{7, 14, 14, 14, 16, 17, 20, 30, 21, 40, 40, 50, 3, 40, 40, 40, 15} {
// avl.Put(v)
// }
// t.Error(avl.Values())
// t.Error(avl.debugString())
}
func TestGetAround(t *testing.T) {
@ -357,17 +357,20 @@ func BenchmarkPut(b *testing.B) {
func TestPutStable(t *testing.T) {
// l := []int{14, 18, 20, 21, 22, 23, 19}
var l []int
for i := 0; len(l) < 100; i++ {
l = append(l, randomdata.Number(0, 65))
}
avl := New(utils.IntComparator)
for _, v := range l {
avl.Put(v)
t.Error(avl.debugString(), v)
}
// var l []int
// for i := 0; len(l) < 10; i++ {
// l = append(l, randomdata.Number(0, 65))
// }
// avl := New(utils.IntComparator)
// for _, v := range l {
// avl.Put(v)
// t.Error(avl.debugString(), v)
// }
// t.Error(avl.Values())
// for _, v := range []int{10, 0, 9, 5, -11, -10, -1, -5} {
// t.Error(avl.Index(v))
// }
// t.Error(len(l), avl.debugString(), "\n", "-----------") // 3 6(4)
}