structure_old/priority_queue/priority_queue.go

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package plist
import (
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"github.com/davecgh/go-spew/spew"
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"github.com/emirpasic/gods/trees/avltree"
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"github.com/emirpasic/gods/utils"
)
// PriorityQueue 优先队列 适合数据量不大, 加索引
type PriorityQueue struct {
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index *avltree.Tree
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indexlimit int
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node *Node
size int
comparator utils.Comparator
}
type Node struct {
value interface{}
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// prev *Node
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next *Node
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}
// NewWithInt compare use int
func NewWithInt() *PriorityQueue {
p := new(PriorityQueue)
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p.comparator = func(a, b interface{}) int {
if a.(int) > b.(int) {
return 1
}
return -1
}
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p.indexlimit = 10
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p.index = avltree.NewWith(p.comparator)
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return p
}
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func (pq *PriorityQueue) String() string {
content := ""
for cur := pq.node; cur != nil; cur = cur.next {
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content += spew.Sprint(cur.value) + "-"
}
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if content != "" {
if content[len(content)-1] == '-' {
content = content[:len(content)-1]
}
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}
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return content
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}
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// func (pq *PriorityQueue) Get(index int) (interface{}, bool) {
// if index < 0 || index >= pq.size {
// return nil, false
// }
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// idx := pq.index
// movesize := index
// for {
// if movesize-idx.nlen <= 0 {
// break
// } else {
// movesize -= idx.nlen
// idx = idx.next
// }
// }
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// cur := idx.node
// for movesize > 0 {
// movesize--
// cur = cur.next
// }
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// return cur.value, true
// }
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// func (pq *PriorityQueue) Push(v interface{}) {
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// node := &Node{value: v}
// pq.size++
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// if pq.node == nil {
// //创建索引
// pq.index.Put(node, 1)
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// pq.node = node
// return
// }
// // find the node of index to start
// fool, ok := pq.index.Ceiling(v)
// cur := idx.node
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// if pq.comparator(v, pq.node.value) > 0 {
// pq.node = node
// node.next = cur
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// pq.index.node = pq.node
// pq.index.nlen++
// return
// }
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// for i := 0; cur.next != nil; i++ {
// // 分裂和整理索引
// if i >= pq.indexlimit {
// if idx.next != nil && idx.next.nlen < pq.indexlimit {
// idx.next.nlen += idx.nlen - pq.indexlimit
// idx.nlen = pq.indexlimit
// idx.next.node = cur
// idx = idx.next
// } else {
// index := new(Index)
// index.node = cur
// index.nlen = idx.nlen - pq.indexlimit
// index.next = idx.next
// idx.next = index
// idx.nlen = pq.indexlimit
// idx = index
// }
// i = 0
// }
// if pq.comparator(v, cur.next.value) > 0 {
// temp := cur.next
// cur.next = node
// node.next = temp
// idx.nlen++
// return
// }
// cur = cur.next
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// }
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// cur.next = node
// idx.nlen++
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// }
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// func (pq *PriorityQueue) Top() (interface{}, bool) {
// return pq.Get(0)
// }
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// func (pq *PriorityQueue) Bottom() (interface{}, bool) {
// return pq.Get(pq.right - 1)
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// }
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// func (pq *PriorityQueue) Get(index int) (interface{}, bool) {
// if index < pq.size {
// return pq.Values()[index], true
// }
// return nil, false
// }
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// func (pq *PriorityQueue) Values() []interface{} {
// // values := pq.datas[pq.left:pq.right]
// // if !pq.isSorted {
// // utils.Sort(values, pq.comparator)
// // pq.isSorted = true
// // }
// return pq.datas[pq.left:pq.right]
// }