feat: add array_deque for JS and TS (#397)
* feat: add array_deque for JS and TS * feat: update the information * Update array_deque.ts * Update array_deque.js * use private property * Update array_deque.js --------- Co-authored-by: steak-zhuo <zhuoqinyue@gmail.com> Co-authored-by: Yudong Jin <krahets@163.com>pull/405/head
zhuoqinyue
2 years ago
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17ff091a03
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8c65345b76
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/**
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* File: array_deque.js
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* Created Time: 2023-02-28
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* Author: Zhuo Qinyue (1403450829@qq.com)
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*/
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/* 基于环形数组实现的双向队列 */
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class ArrayDeque {
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#nums; // 用于存储双向队列元素的数组
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#front; // 队首指针，指向队首元素
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#queSize; // 双向队列长度
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/* 构造方法 */
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constructor(capacity) {
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this.#nums = new Array(capacity);
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this.#front = 0;
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this.#queSize = 0;
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}
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/* 获取双向队列的容量 */
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capacity() {
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return this.#nums.length;
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}
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/* 获取双向队列的长度 */
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size() {
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return this.#queSize;
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}
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/* 判断双向队列是否为空 */
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isEmpty() {
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return this.#queSize === 0;
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}
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/* 计算环形数组索引 */
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index(i) {
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// 通过取余操作实现数组首尾相连
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// 当 i 越过数组尾部后，回到头部
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// 当 i 越过数组头部后，回到尾部
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return (i + this.capacity()) % this.capacity();
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}
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/* 队首入队 */
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pushFirst(num) {
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if (this.#queSize === this.capacity()) {
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console.log("双向队列已满");
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return;
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}
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// 队首指针向左移动一位
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// 通过取余操作，实现 front 越过数组头部后回到尾部
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this.#front = this.index(this.#front - 1);
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// 将 num 添加至队首
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this.#nums[this.#front] = num;
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this.#queSize++;
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}
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/* 队尾入队 */
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pushLast(num) {
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if (this.#queSize === this.capacity()) {
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console.log("双向队列已满");
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return;
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}
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// 计算尾指针，指向队尾索引 + 1
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const rear = this.index(this.#front + this.#queSize);
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// 将 num 添加至队尾
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this.#nums[rear] = num;
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this.#queSize++;
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}
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/* 队首出队 */
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pollFirst() {
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const num = this.peekFirst();
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// 队首指针向后移动一位
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this.#front = this.index(this.#front + 1);
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this.#queSize--;
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return num;
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}
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/* 队尾出队 */
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pollLast() {
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const num = this.peekLast();
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this.#queSize--;
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return num;
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}
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/* 访问队首元素 */
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peekFirst() {
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if (this.isEmpty())
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throw new Error("The Deque Is Empty.");
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return this.#nums[this.#front];
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}
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/* 访问队尾元素 */
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peekLast() {
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if (this.isEmpty())
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throw new Error("The Deque Is Empty.");
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// 计算尾元素索引
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const last = this.index(this.#front + this.#queSize - 1);
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return this.#nums[last];
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}
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/* 返回数组用于打印 */
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toArray() {
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// 仅转换有效长度范围内的列表元素
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const res = [];
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for (let i = 0, j = this.#front; i < this.#queSize; i++, j++) {
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res[i] = this.#nums[this.index(j)];
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}
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return res;
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}
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}
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/* Driver Code */
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/* 初始化双向队列 */
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const capacity = 5;
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const deque = new ArrayDeque(capacity);
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deque.pushLast(3);
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deque.pushLast(2);
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deque.pushLast(5);
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console.log("双向队列 deque = [" + deque.toArray() + "]");
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/* 访问元素 */
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const peekFirst = deque.peekFirst();
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console.log("队首元素 peekFirst = " + peekFirst);
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const peekLast = deque.peekLast();
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console.log("队尾元素 peekLast = " + peekLast);
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/* 元素入队 */
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deque.pushLast(4);
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console.log("元素 4 队尾入队后 deque = [" + deque.toArray() + "]");
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deque.pushFirst(1);
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console.log("元素 1 队首入队后 deque = [" + deque.toArray() + "]");
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/* 元素出队 */
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const pollLast = deque.pollLast();
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console.log("队尾出队元素 = " + pollLast + "，队尾出队后 deque = [" + deque.toArray() + "]");
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const pollFirst = deque.pollFirst();
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console.log("队首出队元素 = " + pollFirst + "，队首出队后 deque = [" + deque.toArray()+ "]");
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/* 获取双向队列的长度 */
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const size = deque.size();
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console.log("双向队列长度 size = " + size);
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/* 判断双向队列是否为空 */
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const isEmpty = deque.isEmpty();
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console.log("双向队列是否为空 = " + isEmpty);
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@ -0,0 +1,149 @@
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/**
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* File: array_deque.ts
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* Created Time: 2023-02-28
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* Author: Zhuo Qinyue (1403450829@qq.com)
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*/
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/* 基于环形数组实现的双向队列 */
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class ArrayDeque {
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private nums: number[]; // 用于存储双向队列元素的数组
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private front: number; // 队首指针，指向队首元素
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private queSize: number; // 双向队列长度
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/* 构造方法 */
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constructor(capacity: number) {
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this.nums = new Array(capacity);
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this.front = 0;
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this.queSize = 0;
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}
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/* 获取双向队列的容量 */
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capacity(): number {
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return this.nums.length;
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}
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/* 获取双向队列的长度 */
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size(): number {
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return this.queSize;
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}
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/* 判断双向队列是否为空 */
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isEmpty(): boolean {
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return this.queSize === 0;
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}
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/* 计算环形数组索引 */
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index(i: number): number {
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// 通过取余操作实现数组首尾相连
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// 当 i 越过数组尾部后，回到头部
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// 当 i 越过数组头部后，回到尾部
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return (i + this.capacity()) % this.capacity();
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}
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/* 队首入队 */
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pushFirst(num: number): void {
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if (this.queSize === this.capacity()) {
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console.log("双向队列已满");
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return;
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}
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// 队首指针向左移动一位
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// 通过取余操作，实现 front 越过数组头部后回到尾部
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this.front = this.index(this.front - 1);
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// 将 num 添加至队首
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this.nums[this.front] = num;
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this.queSize++;
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}
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/* 队尾入队 */
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pushLast(num: number): void {
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if (this.queSize === this.capacity()) {
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console.log("双向队列已满");
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return;
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}
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// 计算尾指针，指向队尾索引 + 1
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const rear: number = this.index(this.front + this.queSize);
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// 将 num 添加至队尾
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this.nums[rear] = num;
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this.queSize++;
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}
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/* 队首出队 */
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pollFirst(): number {
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const num: number = this.peekFirst();
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// 队首指针向后移动一位
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this.front = this.index(this.front + 1);
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this.queSize--;
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return num;
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}
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/* 队尾出队 */
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pollLast(): number {
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const num: number = this.peekLast();
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this.queSize--;
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return num;
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}
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/* 访问队首元素 */
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peekFirst(): number {
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if (this.isEmpty())
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throw new Error("The Deque Is Empty.");
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return this.nums[this.front];
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}
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/* 访问队尾元素 */
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peekLast(): number {
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if (this.isEmpty())
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throw new Error("The Deque Is Empty.");
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// 计算尾元素索引
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const last = this.index(this.front + this.queSize - 1);
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return this.nums[last];
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}
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/* 返回数组用于打印 */
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toArray(): number[] {
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// 仅转换有效长度范围内的列表元素
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const res: number[] = [];
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for (let i = 0, j = this.front; i < this.queSize; i++, j++) {
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res[i] = this.nums[this.index(j)];
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}
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return res;
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}
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}
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/* Driver Code */
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/* 初始化双向队列 */
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const capacity = 5;
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const deque: ArrayDeque = new ArrayDeque(capacity);
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deque.pushLast(3);
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deque.pushLast(2);
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deque.pushLast(5);
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console.log("双向队列 deque = [" + deque.toArray() + "]");
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/* 访问元素 */
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const peekFirst = deque.peekFirst();
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console.log("队首元素 peekFirst = " + peekFirst);
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const peekLast = deque.peekLast();
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console.log("队尾元素 peekLast = " + peekLast);
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/* 元素入队 */
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deque.pushLast(4);
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console.log("元素 4 队尾入队后 deque = [" + deque.toArray() + "]");
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deque.pushFirst(1);
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console.log("元素 1 队首入队后 deque = [" + deque.toArray() + "]");
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/* 元素出队 */
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const pollLast = deque.pollLast();
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console.log("队尾出队元素 = " + pollLast + "，队尾出队后 deque = [" + deque.toArray() + "]");
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const pollFirst = deque.pollFirst();
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console.log("队首出队元素 = " + pollFirst + "，队首出队后 deque = [" + deque.toArray()+ "]");
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/* 获取双向队列的长度 */
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const size = deque.size();
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console.log("双向队列长度 size = " + size);
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/* 判断双向队列是否为空 */
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const isEmpty = deque.isEmpty();
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console.log("双向队列是否为空 = " + isEmpty);
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export {};
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