CS_learn/hello-algo
1
0
Fork 0
mirror of https://github.com/krahets/hello-algo.git synced 2026-05-04 05:12:40 +08:00
Code Issues Packages Projects Releases Wiki Activity

Add build script for Swift.

Browse Source
This commit is contained in:
krahets
2023-02-08 20:30:05 +08:00
parent 05f0054005
commit 38751cc5f5
25 changed files with 128 additions and 1223 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
docs/chapter_tree/avl_tree.md
View File

@@ -362,13 +362,7 @@ G. M. Adelson-Velsky 和 E. M. Landis 在其 1962 年发表的论文 "An algorit
=== "Swift"
```swift title="avl_tree.swift"
/* 获取平衡因子 */
func balanceFactor(node: TreeNode?) -> Int {
// 空结点平衡因子为 0
guard let node = node else { return 0 }
// 结点平衡因子 = 左子树高度 - 右子树高度
return height(node: node.left) - height(node: node.right)
}
[class]{AVLTree}-[func]{balanceFactor}
```
=== "Zig"
@@ -485,19 +479,7 @@ AVL 树的独特之处在于「旋转 Rotation」的操作，其可 **在不影
=== "Swift"
```swift title="avl_tree.swift"
/* 右旋操作 */
func rightRotate(node: TreeNode?) -> TreeNode? {
let child = node?.left
let grandChild = child?.right
// 以 child 为原点，将 node 向右旋转
child?.right = node
node?.left = grandChild
// 更新结点高度
updateHeight(node: node)
updateHeight(node: child)
// 返回旋转后子树的根结点
return child
}
[class]{AVLTree}-[func]{rightRotate}
```
=== "Zig"
@@ -596,20 +578,7 @@ AVL 树的独特之处在于「旋转 Rotation」的操作，其可 **在不影
=== "Swift"
```swift title="avl_tree.swift"
/* 左旋操作 */
func leftRotate(node: TreeNode?) -> TreeNode? {
let child = node?.right
let grandChild = child?.left
// 以 child 为原点，将 node 向左旋转
child?.left = node
node?.right = grandChild
// 更新结点高度
updateHeight(node: node)
updateHeight(node: child)
// 返回旋转后子树的根结点
return child
}
[class]{AVLTree}-[func]{leftRotate}
```
=== "Zig"
@@ -768,35 +737,7 @@ AVL 树的独特之处在于「旋转 Rotation」的操作，其可 **在不影
=== "Swift"
```swift title="avl_tree.swift"
/* 执行旋转操作，使该子树重新恢复平衡 */
func rotate(node: TreeNode?) -> TreeNode? {
// 获取结点 node 的平衡因子
let balanceFactor = balanceFactor(node: node)
// 左偏树
if balanceFactor > 1 {
if self.balanceFactor(node: node?.left) >= 0 {
// 右旋
return rightRotate(node: node)
} else {
// 先左旋后右旋
node?.left = leftRotate(node: node?.left)
return rightRotate(node: node)
}
}
// 右偏树
if balanceFactor < -1 {
if self.balanceFactor(node: node?.right) <= 0 {
// 左旋
return leftRotate(node: node)
} else {
// 先右旋后左旋
node?.right = rightRotate(node: node?.right)
return leftRotate(node: node)
}
}
// 平衡树，无需旋转，直接返回
return node
}
[class]{AVLTree}-[func]{rotate}
```
=== "Zig"