添加一个链表, 和 TODO: hashmap 缓存版本
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0bfa7f1317
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@ -2,20 +2,18 @@ package hashmap
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import (
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"474420502.top/eson/structure/compare"
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"github.com/davecgh/go-spew/spew"
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)
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type avlNode struct {
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children [2]*avlNode
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parent *avlNode
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height int
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hash uint
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key, value interface{}
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}
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type avlTree struct {
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root *avlNode
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size int
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Compare compare.Compare
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root *avlNode
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lsize, rsize int
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Compare compare.Compare
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}
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func avlNew(Compare compare.Compare) *avlTree {
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@ -23,78 +21,78 @@ func avlNew(Compare compare.Compare) *avlTree {
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}
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func (tree *avlTree) Clear() {
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tree.size = 0
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tree.lsize, tree.rsize = 0, 0
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tree.root = nil
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}
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func (tree *avlTree) Size() int {
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return tree.size
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}
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// func (tree *avlTree) Size() int {
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// return tree.lsize + tree.rsize + 1
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// }
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func (tree *avlTree) Remove(key interface{}) (interface{}, bool) {
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// func (tree *avlTree) Remove(key interface{}) (interface{}, bool) {
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if n, ok := tree.GetNode(key); ok {
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// if n, ok := tree.GetNode(key); ok {
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tree.size--
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if tree.size == 0 {
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tree.root = nil
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return n.value, true
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}
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// tree.size--
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// if tree.size == 0 {
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// tree.root = nil
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// return n.value, true
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// }
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left := getHeight(n.children[0])
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right := getHeight(n.children[1])
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// left := getHeight(n.children[0])
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// right := getHeight(n.children[1])
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if left == -1 && right == -1 {
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p := n.parent
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p.children[getRelationship(n)] = nil
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tree.fixRemoveHeight(p)
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return n.value, true
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}
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// if left == -1 && right == -1 {
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// p := n.parent
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// p.children[getRelationship(n)] = nil
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// tree.fixRemoveHeight(p)
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// return n.value, true
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// }
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var cur *avlNode
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if left > right {
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cur = n.children[0]
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for cur.children[1] != nil {
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cur = cur.children[1]
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}
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// var cur *avlNode
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// if left > right {
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// cur = n.children[0]
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// for cur.children[1] != nil {
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// cur = cur.children[1]
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// }
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cleft := cur.children[0]
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cur.parent.children[getRelationship(cur)] = cleft
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if cleft != nil {
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cleft.parent = cur.parent
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}
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// cleft := cur.children[0]
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// cur.parent.children[getRelationship(cur)] = cleft
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// if cleft != nil {
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// cleft.parent = cur.parent
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// }
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} else {
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cur = n.children[1]
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for cur.children[0] != nil {
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cur = cur.children[0]
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}
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// } else {
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// cur = n.children[1]
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// for cur.children[0] != nil {
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// cur = cur.children[0]
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// }
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cright := cur.children[1]
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cur.parent.children[getRelationship(cur)] = cright
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// cright := cur.children[1]
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// cur.parent.children[getRelationship(cur)] = cright
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if cright != nil {
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cright.parent = cur.parent
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}
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}
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// if cright != nil {
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// cright.parent = cur.parent
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// }
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// }
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cparent := cur.parent
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// 修改为interface 交换
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n.value, cur.value = cur.value, n.value
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n.key, cur.key = cur.key, n.key
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// cparent := cur.parent
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// // 修改为interface 交换
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// n.value, cur.value = cur.value, n.value
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// n.key, cur.key = cur.key, n.key
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// 考虑到刚好替换的节点是 被替换节点的孩子节点的时候, 从自身修复高度
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if cparent == n {
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tree.fixRemoveHeight(n)
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} else {
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tree.fixRemoveHeight(cparent)
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}
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// // 考虑到刚好替换的节点是 被替换节点的孩子节点的时候, 从自身修复高度
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// if cparent == n {
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// tree.fixRemoveHeight(n)
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// } else {
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// tree.fixRemoveHeight(cparent)
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// }
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return cur.value, true
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}
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// return cur.value, true
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// }
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return nil, false
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}
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// return nil, false
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// }
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func (tree *avlTree) Get(key interface{}) (interface{}, bool) {
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n, ok := tree.GetNode(key)
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@ -123,15 +121,13 @@ func (tree *avlTree) GetNode(key interface{}) (*avlNode, bool) {
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func (tree *avlTree) PutNode(pnode *avlNode) bool {
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pnode.height = 0
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pnode.children[0] = nil
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pnode.children[1] = nil
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// pnode.parent = nil
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if tree.size == 0 {
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tree.size++
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if tree.root == nil {
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// tree.size++
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tree.root = pnode
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pnode.parent = nil
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return true
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}
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@ -139,23 +135,14 @@ func (tree *avlTree) PutNode(pnode *avlNode) bool {
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c = tree.Compare(pnode.key, cur.key)
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if c == -1 {
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if cur.children[0] == nil {
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tree.size++
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// tree.size++
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cur.children[0] = pnode
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cur.children[0].parent = cur
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if cur.height == 0 {
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tree.fixPutHeight(cur)
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}
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return true
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}
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cur = cur.children[0]
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} else if c == 1 {
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if cur.children[1] == nil {
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tree.size++
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cur.children[1] = pnode
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cur.children[1].parent = cur
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if cur.height == 0 {
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tree.fixPutHeight(cur)
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}
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return true
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}
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cur = cur.children[1]
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@ -169,8 +156,7 @@ func (tree *avlTree) PutNode(pnode *avlNode) bool {
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func (tree *avlTree) Put(key, value interface{}) bool {
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if tree.size == 0 {
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tree.size++
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if tree.root == nil {
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tree.root = &avlNode{key: key, value: value}
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return true
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}
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@ -179,23 +165,13 @@ func (tree *avlTree) Put(key, value interface{}) bool {
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c = tree.Compare(key, cur.key)
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if c == -1 {
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if cur.children[0] == nil {
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tree.size++
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cur.children[0] = &avlNode{key: key, value: value}
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cur.children[0].parent = cur
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if cur.height == 0 {
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tree.fixPutHeight(cur)
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}
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return true
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}
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cur = cur.children[0]
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} else if c == 1 {
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if cur.children[1] == nil {
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tree.size++
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cur.children[1] = &avlNode{key: key, value: value}
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cur.children[1].parent = cur
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if cur.height == 0 {
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tree.fixPutHeight(cur)
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}
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return true
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}
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cur = cur.children[1]
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@ -207,187 +183,11 @@ func (tree *avlTree) Put(key, value interface{}) bool {
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}
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}
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type TraversalMethod int
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const (
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// L = left R = right D = Value(dest)
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_ TraversalMethod = iota
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//DLR 先值 然后左递归 右递归 下面同理
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DLR
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//LDR 先从左边有序访问到右边 从小到大
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LDR
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// LRD 同理
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LRD
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// DRL 同理
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DRL
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// RDL 先从右边有序访问到左边 从大到小
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RDL
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// RLD 同理
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RLD
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)
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// Traversal 遍历的方法 默认是LDR 从小到大 Compare 为 l < r
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func (tree *avlTree) Traversal(every func(node *avlNode) bool, traversalMethod ...interface{}) {
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if tree.root == nil {
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return
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}
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method := LDR
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if len(traversalMethod) != 0 {
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method = traversalMethod[0].(TraversalMethod)
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}
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switch method {
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case DLR:
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var traverasl func(cur *avlNode) bool
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traverasl = func(cur *avlNode) bool {
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if cur == nil {
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return true
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}
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if !every(cur) {
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return false
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}
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if !traverasl(cur.children[0]) {
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return false
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}
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if !traverasl(cur.children[1]) {
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return false
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}
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return true
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}
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traverasl(tree.root)
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case LDR:
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var traverasl func(cur *avlNode) bool
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traverasl = func(cur *avlNode) bool {
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if cur == nil {
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return true
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}
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if !traverasl(cur.children[0]) {
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return false
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}
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if !every(cur) {
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return false
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}
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if !traverasl(cur.children[1]) {
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return false
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}
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return true
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}
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traverasl(tree.root)
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case LRD:
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var traverasl func(cur *avlNode) bool
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traverasl = func(cur *avlNode) bool {
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if cur == nil {
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return true
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}
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if !traverasl(cur.children[0]) {
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return false
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}
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if !traverasl(cur.children[1]) {
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return false
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}
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if !every(cur) {
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return false
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}
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return true
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}
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traverasl(tree.root)
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case DRL:
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var traverasl func(cur *avlNode) bool
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traverasl = func(cur *avlNode) bool {
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if cur == nil {
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return true
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}
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if !every(cur) {
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return false
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}
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if !traverasl(cur.children[0]) {
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return false
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}
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if !traverasl(cur.children[1]) {
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return false
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}
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return true
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}
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traverasl(tree.root)
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case RDL:
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var traverasl func(cur *avlNode) bool
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traverasl = func(cur *avlNode) bool {
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if cur == nil {
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return true
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}
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if !traverasl(cur.children[1]) {
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return false
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}
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if !every(cur) {
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return false
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}
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if !traverasl(cur.children[0]) {
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return false
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}
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return true
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}
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traverasl(tree.root)
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case RLD:
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var traverasl func(cur *avlNode) bool
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traverasl = func(cur *avlNode) bool {
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if cur == nil {
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return true
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}
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if !traverasl(cur.children[1]) {
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return false
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}
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if !traverasl(cur.children[0]) {
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return false
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}
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if !every(cur) {
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return false
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}
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return true
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}
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traverasl(tree.root)
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}
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}
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func (tree *avlTree) lrrotate(cur *avlNode) {
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const l = 1
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const r = 0
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movparent := cur.children[l]
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mov := movparent.children[r]
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mov.value, cur.value = cur.value, mov.value //交换值达到, 相对位移
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mov.key, cur.key = cur.key, mov.key
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if mov.children[l] != nil {
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movparent.children[r] = mov.children[l]
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movparent.children[r].parent = movparent
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//movparent.children[r].child = l
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} else {
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movparent.children[r] = nil
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}
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if mov.children[r] != nil {
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mov.children[l] = mov.children[r]
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//mov.children[l].child = l
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} else {
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mov.children[l] = nil
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}
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if cur.children[r] != nil {
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mov.children[r] = cur.children[r]
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mov.children[r].parent = mov
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} else {
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mov.children[r] = nil
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}
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cur.children[r] = mov
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mov.parent = cur
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mov.height = getMaxChildrenHeight(mov) + 1
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movparent.height = getMaxChildrenHeight(movparent) + 1
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cur.height = getMaxChildrenHeight(cur) + 1
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}
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func (tree *avlTree) rlrotate(cur *avlNode) {
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@ -395,38 +195,6 @@ func (tree *avlTree) rlrotate(cur *avlNode) {
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const l = 0
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const r = 1
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movparent := cur.children[l]
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mov := movparent.children[r]
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mov.value, cur.value = cur.value, mov.value //交换值达到, 相对位移
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mov.key, cur.key = cur.key, mov.key
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if mov.children[l] != nil {
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movparent.children[r] = mov.children[l]
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movparent.children[r].parent = movparent
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} else {
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movparent.children[r] = nil
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}
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if mov.children[r] != nil {
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mov.children[l] = mov.children[r]
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} else {
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mov.children[l] = nil
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}
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if cur.children[r] != nil {
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mov.children[r] = cur.children[r]
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mov.children[r].parent = mov
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} else {
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mov.children[r] = nil
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}
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cur.children[r] = mov
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mov.parent = cur
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mov.height = getMaxChildrenHeight(mov) + 1
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movparent.height = getMaxChildrenHeight(movparent) + 1
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cur.height = getMaxChildrenHeight(cur) + 1
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}
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func (tree *avlTree) rrotate(cur *avlNode) {
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@ -439,29 +207,6 @@ func (tree *avlTree) rrotate(cur *avlNode) {
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mov.value, cur.value = cur.value, mov.value //交换值达到, 相对位移
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mov.key, cur.key = cur.key, mov.key
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// mov.children[l]不可能为nil
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mov.children[l].parent = cur
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cur.children[l] = mov.children[l]
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// 解决mov节点孩子转移的问题
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if mov.children[r] != nil {
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mov.children[l] = mov.children[r]
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} else {
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mov.children[l] = nil
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}
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if cur.children[r] != nil {
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mov.children[r] = cur.children[r]
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mov.children[r].parent = mov
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} else {
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mov.children[r] = nil
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}
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// 连接转移后的节点 由于mov只是与cur交换值,parent不变
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cur.children[r] = mov
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mov.height = getMaxChildrenHeight(mov) + 1
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cur.height = getMaxChildrenHeight(cur) + 1
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}
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func (tree *avlTree) lrotate(cur *avlNode) {
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@ -473,221 +218,4 @@ func (tree *avlTree) lrotate(cur *avlNode) {
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mov.value, cur.value = cur.value, mov.value //交换值达到, 相对位移
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mov.key, cur.key = cur.key, mov.key
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// 不可能为nil
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mov.children[l].parent = cur
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cur.children[l] = mov.children[l]
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if mov.children[r] != nil {
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mov.children[l] = mov.children[r]
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} else {
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mov.children[l] = nil
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}
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if cur.children[r] != nil {
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mov.children[r] = cur.children[r]
|
||||
mov.children[r].parent = mov
|
||||
} else {
|
||||
mov.children[r] = nil
|
||||
}
|
||||
|
||||
cur.children[r] = mov
|
||||
|
||||
mov.height = getMaxChildrenHeight(mov) + 1
|
||||
cur.height = getMaxChildrenHeight(cur) + 1
|
||||
}
|
||||
|
||||
func getMaxAndChildrenHeight(cur *avlNode) (h1, h2, maxh int) {
|
||||
h1 = getHeight(cur.children[0])
|
||||
h2 = getHeight(cur.children[1])
|
||||
if h1 > h2 {
|
||||
maxh = h1
|
||||
} else {
|
||||
maxh = h2
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
func getMaxChildrenHeight(cur *avlNode) int {
|
||||
h1 := getHeight(cur.children[0])
|
||||
h2 := getHeight(cur.children[1])
|
||||
if h1 > h2 {
|
||||
return h1
|
||||
}
|
||||
return h2
|
||||
}
|
||||
|
||||
func getHeight(cur *avlNode) int {
|
||||
if cur == nil {
|
||||
return -1
|
||||
}
|
||||
return cur.height
|
||||
}
|
||||
|
||||
func (tree *avlTree) fixRemoveHeight(cur *avlNode) {
|
||||
for {
|
||||
|
||||
lefth, rigthh, lrmax := getMaxAndChildrenHeight(cur)
|
||||
|
||||
// 判断当前节点是否有变化, 如果没变化的时候, 不需要往上修复
|
||||
curheight := lrmax + 1
|
||||
cur.height = curheight
|
||||
|
||||
// 计算高度的差值 绝对值大于2的时候需要旋转
|
||||
diff := lefth - rigthh
|
||||
if diff < -1 {
|
||||
r := cur.children[1] // 根据左旋转的右边节点的子节点 左右高度选择旋转的方式
|
||||
if getHeight(r.children[0]) > getHeight(r.children[1]) {
|
||||
tree.lrrotate(cur)
|
||||
} else {
|
||||
tree.lrotate(cur)
|
||||
}
|
||||
} else if diff > 1 {
|
||||
l := cur.children[0]
|
||||
if getHeight(l.children[1]) > getHeight(l.children[0]) {
|
||||
tree.rlrotate(cur)
|
||||
} else {
|
||||
tree.rrotate(cur)
|
||||
}
|
||||
} else {
|
||||
if cur.height == curheight {
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
if cur.parent == nil {
|
||||
return
|
||||
}
|
||||
|
||||
cur = cur.parent
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func (tree *avlTree) fixPutHeight(cur *avlNode) {
|
||||
|
||||
for {
|
||||
|
||||
lefth := getHeight(cur.children[0])
|
||||
rigthh := getHeight(cur.children[1])
|
||||
|
||||
// 计算高度的差值 绝对值大于2的时候需要旋转
|
||||
diff := lefth - rigthh
|
||||
if diff < -1 {
|
||||
r := cur.children[1] // 根据左旋转的右边节点的子节点 左右高度选择旋转的方式
|
||||
if getHeight(r.children[0]) > getHeight(r.children[1]) {
|
||||
tree.lrrotate(cur)
|
||||
} else {
|
||||
tree.lrotate(cur)
|
||||
}
|
||||
} else if diff > 1 {
|
||||
l := cur.children[0]
|
||||
if getHeight(l.children[1]) > getHeight(l.children[0]) {
|
||||
tree.rlrotate(cur)
|
||||
} else {
|
||||
tree.rrotate(cur)
|
||||
}
|
||||
|
||||
} else {
|
||||
// 选择一个child的最大高度 + 1为 高度
|
||||
if lefth > rigthh {
|
||||
cur.height = lefth + 1
|
||||
} else {
|
||||
cur.height = rigthh + 1
|
||||
}
|
||||
}
|
||||
|
||||
if cur.parent == nil || cur.height < cur.parent.height {
|
||||
return
|
||||
}
|
||||
cur = cur.parent
|
||||
}
|
||||
}
|
||||
|
||||
func getRelationship(cur *avlNode) int {
|
||||
if cur.parent.children[1] == cur {
|
||||
return 1
|
||||
}
|
||||
return 0
|
||||
}
|
||||
|
||||
func output(node *avlNode, prefix string, isTail bool, str *string) {
|
||||
|
||||
if node.children[1] != nil {
|
||||
newPrefix := prefix
|
||||
if isTail {
|
||||
newPrefix += "│ "
|
||||
} else {
|
||||
newPrefix += " "
|
||||
}
|
||||
output(node.children[1], newPrefix, false, str)
|
||||
}
|
||||
*str += prefix
|
||||
if isTail {
|
||||
*str += "└── "
|
||||
} else {
|
||||
*str += "┌── "
|
||||
}
|
||||
|
||||
*str += spew.Sprint(node.value) + "\n"
|
||||
|
||||
if node.children[0] != nil {
|
||||
newPrefix := prefix
|
||||
if isTail {
|
||||
newPrefix += " "
|
||||
} else {
|
||||
newPrefix += "│ "
|
||||
}
|
||||
output(node.children[0], newPrefix, true, str)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func outputfordebug(node *avlNode, prefix string, isTail bool, str *string) {
|
||||
|
||||
if node.children[1] != nil {
|
||||
newPrefix := prefix
|
||||
if isTail {
|
||||
newPrefix += "│ "
|
||||
} else {
|
||||
newPrefix += " "
|
||||
}
|
||||
outputfordebug(node.children[1], newPrefix, false, str)
|
||||
}
|
||||
*str += prefix
|
||||
if isTail {
|
||||
*str += "└── "
|
||||
} else {
|
||||
*str += "┌── "
|
||||
}
|
||||
|
||||
suffix := "("
|
||||
parentv := ""
|
||||
if node.parent == nil {
|
||||
parentv = "nil"
|
||||
} else {
|
||||
parentv = spew.Sprint(node.parent.value)
|
||||
}
|
||||
suffix += parentv + "|" + spew.Sprint(node.height) + ")"
|
||||
*str += spew.Sprint(node.value) + suffix + "\n"
|
||||
|
||||
if node.children[0] != nil {
|
||||
newPrefix := prefix
|
||||
if isTail {
|
||||
newPrefix += " "
|
||||
} else {
|
||||
newPrefix += "│ "
|
||||
}
|
||||
outputfordebug(node.children[0], newPrefix, true, str)
|
||||
}
|
||||
}
|
||||
|
||||
func (tree *avlTree) debugString() string {
|
||||
if tree.size == 0 {
|
||||
return ""
|
||||
}
|
||||
str := "AVLTree\n"
|
||||
outputfordebug(tree.root, "", true, &str)
|
||||
return str
|
||||
}
|
||||
|
|
|
|||
108
list/list.go
Normal file
108
list/list.go
Normal file
|
|
@ -0,0 +1,108 @@
|
|||
package list
|
||||
|
||||
type Node struct {
|
||||
next *Node
|
||||
value interface{}
|
||||
}
|
||||
|
||||
func (node *Node) Value() interface{} {
|
||||
return node.value
|
||||
}
|
||||
|
||||
type List struct {
|
||||
head *Node
|
||||
size uint
|
||||
}
|
||||
|
||||
func New() *List {
|
||||
return &List{}
|
||||
}
|
||||
|
||||
func (l *List) Size() uint {
|
||||
return l.size
|
||||
}
|
||||
|
||||
func (l *List) Push(v interface{}) {
|
||||
l.size++
|
||||
if l.head == nil {
|
||||
l.head = &Node{value: v}
|
||||
return
|
||||
}
|
||||
l.head = &Node{value: v, next: l.head}
|
||||
}
|
||||
|
||||
func (l *List) PushNode(n *Node) {
|
||||
l.size++
|
||||
if l.head == nil {
|
||||
l.head = n
|
||||
return
|
||||
}
|
||||
|
||||
n.next = l.head
|
||||
l.head = n
|
||||
}
|
||||
|
||||
func (l *List) Pop() (result interface{}, found bool) {
|
||||
if n, ok := l.PopNode(); ok {
|
||||
return n.value, ok
|
||||
}
|
||||
return nil, false
|
||||
}
|
||||
|
||||
func (l *List) PopNode() (result *Node, found bool) {
|
||||
if l.head == nil {
|
||||
return nil, false
|
||||
}
|
||||
|
||||
result = l.head
|
||||
found = true
|
||||
l.head = result.next
|
||||
result.next = nil
|
||||
l.size--
|
||||
return
|
||||
}
|
||||
|
||||
func (l *List) Remove(idx uint) (result *Node, found bool) {
|
||||
if l.size == 0 {
|
||||
return nil, false
|
||||
}
|
||||
|
||||
if idx == 0 {
|
||||
result = l.head
|
||||
found = true
|
||||
l.head = result.next
|
||||
result.next = nil
|
||||
l.size--
|
||||
return
|
||||
}
|
||||
|
||||
for cur := l.head; cur.next != nil; cur = cur.next {
|
||||
if idx == 1 {
|
||||
l.size--
|
||||
result = cur.next
|
||||
found = true
|
||||
cur.next = result.next
|
||||
result.next = nil
|
||||
return
|
||||
}
|
||||
idx--
|
||||
}
|
||||
|
||||
return nil, false
|
||||
}
|
||||
|
||||
func (l *List) Values() (result []interface{}) {
|
||||
l.Traversal(func(cur *Node) bool {
|
||||
result = append(result, cur.value)
|
||||
return true
|
||||
})
|
||||
return
|
||||
}
|
||||
|
||||
func (l *List) Traversal(every func(*Node) bool) {
|
||||
for cur := l.head; cur != nil; cur = cur.next {
|
||||
if !every(cur) {
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
87
list/list_test.go
Normal file
87
list/list_test.go
Normal file
|
|
@ -0,0 +1,87 @@
|
|||
package list
|
||||
|
||||
import (
|
||||
"testing"
|
||||
|
||||
"github.com/davecgh/go-spew/spew"
|
||||
)
|
||||
|
||||
func TestPush(t *testing.T) {
|
||||
l := New()
|
||||
for i := 0; i < 5; i++ {
|
||||
l.Push(i)
|
||||
}
|
||||
var result string
|
||||
result = spew.Sprint(l.Values())
|
||||
if result != "[4 3 2 1 0]" {
|
||||
t.Error(result)
|
||||
}
|
||||
|
||||
l.Push(0)
|
||||
result = spew.Sprint(l.Values())
|
||||
if result != "[0 4 3 2 1 0]" {
|
||||
t.Error(result)
|
||||
}
|
||||
}
|
||||
|
||||
func TestPop(t *testing.T) {
|
||||
l := New()
|
||||
for i := 0; i < 5; i++ {
|
||||
l.Push(i)
|
||||
}
|
||||
|
||||
if v, ok := l.Pop(); ok {
|
||||
if v != 4 {
|
||||
t.Error(v)
|
||||
}
|
||||
} else {
|
||||
t.Error("Pop should ok, but is not ok")
|
||||
}
|
||||
|
||||
var result string
|
||||
result = spew.Sprint(l.Values())
|
||||
if result != "[3 2 1 0]" {
|
||||
t.Error(result)
|
||||
}
|
||||
|
||||
for i := 3; l.Size() != 0; i-- {
|
||||
if v, ok := l.Pop(); ok {
|
||||
if v != i {
|
||||
t.Error(i, v, "is not equals")
|
||||
}
|
||||
} else {
|
||||
t.Error("Pop should ok, but is not ok", i)
|
||||
}
|
||||
}
|
||||
|
||||
l.Push(0)
|
||||
result = spew.Sprint(l.Values())
|
||||
if result != "[0]" {
|
||||
t.Error(result)
|
||||
}
|
||||
|
||||
if l.Size() != 1 {
|
||||
t.Error("l.Size() == 1, but is error, size = ", l.Size())
|
||||
}
|
||||
}
|
||||
|
||||
func TestRemove(t *testing.T) {
|
||||
l := New()
|
||||
for i := 0; i < 5; i++ {
|
||||
l.Push(i)
|
||||
}
|
||||
|
||||
for i := 0; i < 5; i++ {
|
||||
if n, ok := l.Remove(0); ok {
|
||||
if n.Value() != 4-i {
|
||||
t.Error(n)
|
||||
}
|
||||
} else {
|
||||
t.Error("Pop should ok, but is not ok", i)
|
||||
}
|
||||
}
|
||||
|
||||
if l.Size() != 0 {
|
||||
t.Error("l.Size() == 0, but is error, size = ", l.Size())
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user