Update JavaScript and TypeScript codes for all chapters, rename JavaScript and TypeScript import folder to modules (#402)

* Update JavaScript and TypeScript codes

* Rename JavaScript and TypeScript import folder to modules
This commit is contained in:
Justin Tse
2023-03-03 01:34:53 +08:00
committed by GitHub
parent 7b41e6c2f0
commit e4a98bc9c5
61 changed files with 324 additions and 290 deletions

View File

@ -4,8 +4,8 @@
* Author: what-is-me (whatisme@outlook.jp)
*/
const { TreeNode } = require("../include/TreeNode");
const { printTree } = require("../include/PrintUtil");
const { TreeNode } = require("../modules/TreeNode");
const { printTree } = require("../modules/PrintUtil");
/* AVL 树*/
class AVLTree {
@ -21,7 +21,7 @@ class AVLTree {
}
/* 更新结点高度 */
updateHeight(node) {
#updateHeight(node) {
// 结点高度等于最高子树高度 + 1
node.height = Math.max(this.height(node.left), this.height(node.right)) + 1;
}
@ -35,57 +35,57 @@ class AVLTree {
}
/* 右旋操作 */
rightRotate(node) {
#rightRotate(node) {
const child = node.left;
const 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
this.updateHeight(node);
this.updateHeight(child);
this.#updateHeight(node);
this.#updateHeight(child);
// 返回旋转后子树的根结点
return child;
}
/* 左旋操作 */
leftRotate(node) {
#leftRotate(node) {
const child = node.right;
const 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
this.updateHeight(node);
this.updateHeight(child);
this.#updateHeight(node);
this.#updateHeight(child);
// 返回旋转后子树的根结点
return child;
}
/* 执行旋转操作,使该子树重新恢复平衡 */
rotate(node) {
#rotate(node) {
// 获取结点 node 的平衡因子
const balanceFactor = this.balanceFactor(node);
// 左偏树
if (balanceFactor > 1) {
if (this.balanceFactor(node.left) >= 0) {
// 右旋
return this.rightRotate(node);
return this.#rightRotate(node);
} else {
// 先左旋后右旋
node.left = this.leftRotate(node.left);
return this.rightRotate(node);
node.left = this.#leftRotate(node.left);
return this.#rightRotate(node);
}
}
// 右偏树
if (balanceFactor < -1) {
if (this.balanceFactor(node.right) <= 0) {
// 左旋
return this.leftRotate(node);
return this.#leftRotate(node);
} else {
// 先右旋后左旋
node.right = this.rightRotate(node.right);
return this.leftRotate(node);
node.right = this.#rightRotate(node.right);
return this.#leftRotate(node);
}
}
// 平衡树,无需旋转,直接返回
@ -94,36 +94,36 @@ class AVLTree {
/* 插入结点 */
insert(val) {
this.root = this.insertHelper(this.root, val);
this.root = this.#insertHelper(this.root, val);
return this.root;
}
/* 递归插入结点(辅助方法) */
insertHelper(node, val) {
#insertHelper(node, val) {
if (node === null) return new TreeNode(val);
/* 1. 查找插入位置,并插入结点 */
if (val < node.val) node.left = this.insertHelper(node.left, val);
else if (val > node.val) node.right = this.insertHelper(node.right, val);
if (val < node.val) node.left = this.#insertHelper(node.left, val);
else if (val > node.val) node.right = this.#insertHelper(node.right, val);
else return node; // 重复结点不插入,直接返回
this.updateHeight(node); // 更新结点高度
this.#updateHeight(node); // 更新结点高度
/* 2. 执行旋转操作,使该子树重新恢复平衡 */
node = this.rotate(node);
node = this.#rotate(node);
// 返回子树的根结点
return node;
}
/* 删除结点 */
remove(val) {
this.root = this.removeHelper(this.root, val);
this.root = this.#removeHelper(this.root, val);
return this.root;
}
/* 递归删除结点(辅助方法) */
removeHelper(node, val) {
#removeHelper(node, val) {
if (node === null) return null;
/* 1. 查找结点,并删除之 */
if (val < node.val) node.left = this.removeHelper(node.left, val);
else if (val > node.val) node.right = this.removeHelper(node.right, val);
if (val < node.val) node.left = this.#removeHelper(node.left, val);
else if (val > node.val) node.right = this.#removeHelper(node.right, val);
else {
if (node.left === null || node.right === null) {
const child = node.left !== null ? node.left : node.right;
@ -133,20 +133,20 @@ class AVLTree {
else node = child;
} else {
// 子结点数量 = 2 ,则将中序遍历的下个结点删除,并用该结点替换当前结点
const temp = this.getInOrderNext(node.right);
node.right = this.removeHelper(node.right, temp.val);
const temp = this.#getInOrderNext(node.right);
node.right = this.#removeHelper(node.right, temp.val);
node.val = temp.val;
}
}
this.updateHeight(node); // 更新结点高度
this.#updateHeight(node); // 更新结点高度
/* 2. 执行旋转操作,使该子树重新恢复平衡 */
node = this.rotate(node);
node = this.#rotate(node);
// 返回子树的根结点
return node;
}
/* 获取中序遍历中的下一个结点(仅适用于 root 有左子结点的情况) */
getInOrderNext(node) {
#getInOrderNext(node) {
if (node === null) return node;
// 循环访问左子结点,直到叶结点时为最小结点,跳出
while (node.left !== null) {