Update the chapter of stack and queue.
This commit is contained in:
parent
e79b800bb2
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7283bbaf6f
@ -59,7 +59,6 @@ public:
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/* 访问队首元素 */
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int peek() {
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// 删除头结点
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if (empty())
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throw out_of_range("队列为空");
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return nums[front];
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@ -58,7 +58,6 @@ class ArrayQueue {
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/* 访问队首元素 */
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public int peek() {
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// 删除头结点
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if (isEmpty())
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throw new EmptyStackException();
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return nums[front];
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@ -7,13 +7,12 @@
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/* 基于环形数组实现的队列 */
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class ArrayQueue {
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#queue; // 用于存储队列元素的数组
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#front = 0; // 头指针,指向队首
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#rear = 0; // 尾指针,指向队尾 + 1
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#CAPACITY = 1e3; // 默认初始容量
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#queue; // 用于存储队列元素的数组
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#front = 0; // 头指针,指向队首
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#rear = 0; // 尾指针,指向队尾 + 1
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constructor(capacity) {
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this.#queue = new Array(capacity ?? this.CAPACITY);
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this.#queue = new Array(capacity);
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}
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/* 获取队列的容量 */
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@ -52,7 +51,6 @@ class ArrayQueue {
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/* 访问队首元素 */
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peek() {
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// 删除头结点
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if (this.empty())
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throw new Error("队列为空");
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return this.#queue[this.#front];
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@ -11,6 +11,7 @@ class ArrayStack {
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constructor() {
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this.stack = [];
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}
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/* 获取栈的长度 */
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get size() {
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return this.stack.length;
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@ -28,19 +29,22 @@ class ArrayStack {
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/* 出栈 */
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pop() {
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if (this.empty()) throw "栈为空";
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if (this.empty())
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throw new Error("栈为空");
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return this.stack.pop();
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}
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/* 访问栈顶元素 */
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top() {
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if (this.empty()) throw "栈为空";
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if (this.empty())
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throw new Error("栈为空");
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return this.stack[this.stack.length - 1];
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}
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/* 访问索引 index 处元素 */
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get(index) {
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if (index >= this.size) throw "索引越界";
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if (index >= this.size)
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throw new Error("索引越界");
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return this.stack[index];
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}
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@ -8,8 +8,8 @@ const ListNode = require("../include/ListNode");
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/* 基于链表实现的队列 */
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class LinkedListQueue {
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#front;
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#rear; // 头结点 #front ,尾结点 #rear
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#front; // 头结点 #front
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#rear; // 尾结点 #rear
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#queSize = 0;
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constructor() {
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@ -46,9 +46,6 @@ class LinkedListQueue {
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/* 出队 */
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poll() {
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const num = this.peek();
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if (!this.#front) {
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throw new Error("队列为空")
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}
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// 删除头结点
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this.#front = this.#front.next;
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this.#queSize--;
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@ -75,6 +72,8 @@ class LinkedListQueue {
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}
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/* Driver Code */
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/* 初始化队列 */
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const queue = new LinkedListQueue();
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@ -8,7 +8,6 @@
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/* Driver Code */
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/* 初始化队列 */
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// JavaScript 没有内置的队列,可以把 Array 当作队列来使用
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// 注意:由于是数组,所以 shift() 的时间复杂度是 O(n)
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const queue = [];
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/* 元素入队 */
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@ -22,7 +21,7 @@ queue.push(4);
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const peek = queue[0];
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/* 元素出队 */
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// shift() 方法的时间复杂度为 O(n)
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// 底层是数组,因此 shift() 方法的时间复杂度为 O(n)
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const poll = queue.shift();
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/* 获取队列的长度 */
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@ -4,6 +4,8 @@
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* Author: S-N-O-R-L-A-X (snorlax.xu@outlook.com)
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*/
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/* Driver Code */
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/* 初始化栈 */
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// Javascript 没有内置的栈类,可以把 Array 当作栈来使用
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const stack = [];
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@ -42,7 +42,6 @@ class ArrayQueue:
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""" 出队 """
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def poll(self):
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# 删除头结点
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num = self.peek()
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# 队头指针向后移动一位,若越过尾部则返回到数组头部
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self.__front = (self.__front + 1) % self.capacity()
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@ -50,7 +49,6 @@ class ArrayQueue:
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""" 访问队首元素 """
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def peek(self):
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# 删除头结点
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if self.is_empty():
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print("队列为空")
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return False
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@ -34,10 +34,8 @@ class ArrayQueue {
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/* 入队 */
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offer(num: number): void {
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if (this.size == this.capacity) {
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console.log("队列已满");
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return;
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}
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if (this.size == this.capacity)
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throw new Error("队列已满");
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// 尾结点后添加 num
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this.queue[this.rear] = num;
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// 尾指针向后移动一位,越过尾部后返回到数组头部
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@ -54,16 +52,15 @@ class ArrayQueue {
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/* 访问队首元素 */
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peek(): number {
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// 删除头结点
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if (this.empty())
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throw new Error("The queue is empty!");
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throw new Error("队列为空");
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return this.queue[this.front];
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}
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/* 访问指定索引元素 */
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get(index: number): number {
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if (index >= this.size)
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throw new Error("Index out of bounds!");
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throw new Error("索引越界");
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return this.queue[(this.front + index) % this.capacity];
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}
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@ -29,19 +29,22 @@ class ArrayStack {
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/* 出栈 */
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pop(): number | undefined {
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if (this.empty()) throw new Error('栈为空');
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if (this.empty())
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throw new Error('栈为空');
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return this.stack.pop();
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}
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/* 访问栈顶元素 */
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top(): number | undefined {
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if (this.empty()) throw new Error('栈为空');
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if (this.empty())
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throw new Error('栈为空');
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return this.stack[this.stack.length - 1];
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}
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/* 访问索引 index 处元素 */
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get(index: number): number | undefined {
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if (index >= this.size) throw new Error('索引越界');
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if (index >= this.size)
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throw new Error('索引越界');
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return this.stack[index];
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}
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@ -8,8 +8,8 @@ import ListNode from "../module/ListNode"
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/* 基于链表实现的队列 */
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class LinkedListQueue {
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private front: ListNode | null;
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private rear: ListNode | null; // 头结点 front ,尾结点 rear
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private front: ListNode | null; // 头结点 front
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private rear: ListNode | null; // 尾结点 rear
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private queSize: number = 0;
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constructor() {
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@ -46,9 +46,8 @@ class LinkedListQueue {
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/* 出队 */
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poll(): number {
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const num = this.peek();
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if (!this.front) {
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throw new Error("No element in queue!")
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}
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if (!this.front)
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throw new Error("队列为空")
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// 删除头结点
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this.front = this.front.next;
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this.queSize--;
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@ -58,7 +57,7 @@ class LinkedListQueue {
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/* 访问队首元素 */
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peek(): number {
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if (this.size === 0)
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throw new Error("No element in queue!");
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throw new Error("队列为空");
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return this.front!.val;
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}
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@ -6,7 +6,6 @@
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/* 初始化队列 */
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// TypeScript 没有内置的队列,可以把 Array 当作队列来使用
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// 注意:由于是数组,所以 shift() 的时间复杂度是 O(n)
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const queue: number[] = [];
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/* 元素入队 */
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@ -20,7 +19,7 @@ queue.push(4);
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const peek = queue[0];
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/* 元素出队 */
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// O(n)
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// 底层是数组,因此 shift() 方法的时间复杂度为 O(n)
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const poll = queue.shift();
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/* 获取队列的长度 */
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@ -145,7 +145,6 @@ comments: true
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```js title="queue.js"
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/* 初始化队列 */
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// JavaScript 没有内置的队列,可以把 Array 当作队列来使用
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// 注意:由于是数组,所以 shift() 的时间复杂度是 O(n)
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const queue = [];
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/* 元素入队 */
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@ -159,7 +158,7 @@ comments: true
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const peek = queue[0];
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/* 元素出队 */
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// O(n)
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// 底层是数组,因此 shift() 方法的时间复杂度为 O(n)
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const poll = queue.shift();
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/* 获取队列的长度 */
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@ -174,7 +173,6 @@ comments: true
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```typescript title="queue.ts"
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/* 初始化队列 */
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// TypeScript 没有内置的队列,可以把 Array 当作队列来使用
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// 注意:由于是数组,所以 shift() 的时间复杂度是 O(n)
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const queue: number[] = [];
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/* 元素入队 */
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@ -188,7 +186,7 @@ comments: true
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const peek = queue[0];
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/* 元素出队 */
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// O(n)
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// 底层是数组,因此 shift() 方法的时间复杂度为 O(n)
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const poll = queue.shift();
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/* 获取队列的长度 */
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@ -382,19 +380,16 @@ comments: true
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// 使用内置包 list 来实现队列
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data *list.List
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}
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// NewLinkedListQueue 初始化链表
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func NewLinkedListQueue() *LinkedListQueue {
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return &LinkedListQueue{
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data: list.New(),
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}
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}
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// Offer 入队
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func (s *LinkedListQueue) Offer(value any) {
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s.data.PushBack(value)
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}
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// Poll 出队
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func (s *LinkedListQueue) Poll() any {
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if s.IsEmpty() {
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@ -404,7 +399,6 @@ comments: true
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s.data.Remove(e)
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return e.Value
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}
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// Peek 访问队首元素
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func (s *LinkedListQueue) Peek() any {
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if s.IsEmpty() {
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@ -413,12 +407,10 @@ comments: true
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e := s.data.Front()
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return e.Value
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}
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// Size 获取队列的长度
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func (s *LinkedListQueue) Size() int {
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return s.data.Len()
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}
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// IsEmpty 判断队列是否为空
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func (s *LinkedListQueue) IsEmpty() bool {
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return s.data.Len() == 0
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@ -428,26 +420,23 @@ comments: true
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=== "JavaScript"
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```js title="linkedlist_queue.js"
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/* 基于链表实现的队列 */
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class LinkedListQueue {
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#front;
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#rear; // 头结点 #front ,尾结点 #rear
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#front; // 头结点 #front
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#rear; // 尾结点 #rear
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#queSize = 0;
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constructor() {
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this.#front = null;
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this.#rear = null;
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}
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/* 获取队列的长度 */
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get size() {
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return this.#queSize;
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}
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/* 判断队列是否为空 */
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isEmpty() {
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return this.size === 0;
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}
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/* 入队 */
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offer(num) {
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// 尾结点后添加 num
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@ -463,36 +452,20 @@ comments: true
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}
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this.#queSize++;
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}
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/* 出队 */
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poll() {
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const num = this.peek();
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if (!this.#front) {
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throw new Error("No element in queue!")
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}
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// 删除头结点
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this.#front = this.#front.next;
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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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peek() {
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if (this.size === 0)
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throw new Error("No element in queue!");
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throw new Error("队列为空");
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return this.#front.val;
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}
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/* 将链表转化为 Array 并返回 */
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toArray() {
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let node = this.#front;
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const res = new Array(this.size);
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for (let i = 0; i < res.length; i++) {
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res[i] = node.val;
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node = node.next;
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}
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return res;
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}
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}
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```
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@ -501,25 +474,21 @@ comments: true
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```typescript title="linkedlist_queue.ts"
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/* 基于链表实现的队列 */
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class LinkedListQueue {
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private front: ListNode | null;
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private rear: ListNode | null; // 头结点 front ,尾结点 rear
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private front: ListNode | null; // 头结点 front
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private rear: ListNode | null; // 尾结点 rear
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private queSize: number = 0;
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constructor() {
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this.front = null;
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this.rear = null;
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}
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/* 获取队列的长度 */
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get size(): number {
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return this.queSize;
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}
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/* 判断队列是否为空 */
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isEmpty(): boolean {
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return this.size === 0;
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}
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/* 入队 */
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offer(num: number): void {
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// 尾结点后添加 num
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@ -535,36 +504,22 @@ comments: true
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}
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this.queSize++;
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}
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/* 出队 */
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poll(): number {
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const num = this.peek();
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if (!this.front) {
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throw new Error("No element in queue!")
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}
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if (!this.front)
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throw new Error("队列为空")
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// 删除头结点
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this.front = this.front.next;
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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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peek(): number {
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if (this.size === 0)
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throw new Error("No element in queue!");
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throw new Error("队列为空");
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return this.front!.val;
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}
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/* 将链表转化为 Array 并返回 */
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toArray(): number[] {
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let node = this.front;
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const res = new Array<number>(this.size);
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for (let i = 0; i < res.length; i++) {
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res[i] = node!.val;
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node = node!.next;
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}
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return res;
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}
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}
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```
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@ -637,7 +592,6 @@ comments: true
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}
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/* 访问队首元素 */
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public int peek() {
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// 删除头结点
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if (isEmpty())
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throw new EmptyStackException();
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return nums[front];
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@ -701,7 +655,6 @@ comments: true
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}
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/* 访问队首元素 */
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int peek() {
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// 删除头结点
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if (empty())
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throw out_of_range("队列为空");
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return nums[front];
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@ -750,7 +703,6 @@ comments: true
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""" 出队 """
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def poll(self):
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# 删除头结点
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num = self.peek()
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# 队头指针向后移动一位,若越过尾部则返回到数组头部
|
||||
self.__front = (self.__front + 1) % self.capacity()
|
||||
@ -758,7 +710,6 @@ comments: true
|
||||
|
||||
""" 访问队首元素 """
|
||||
def peek(self):
|
||||
# 删除头结点
|
||||
if self.is_empty():
|
||||
print("队列为空")
|
||||
return False
|
||||
@ -791,7 +742,6 @@ comments: true
|
||||
front int // 头指针,指向队首
|
||||
rear int // 尾指针,指向队尾 + 1
|
||||
}
|
||||
|
||||
// NewArrayQueue 基于环形数组实现的队列
|
||||
func NewArrayQueue(capacity int) *ArrayQueue {
|
||||
return &ArrayQueue{
|
||||
@ -801,18 +751,15 @@ comments: true
|
||||
rear: 0,
|
||||
}
|
||||
}
|
||||
|
||||
// Size 获取队列的长度
|
||||
func (q *ArrayQueue) Size() int {
|
||||
size := (q.capacity + q.rear - q.front) % q.capacity
|
||||
return size
|
||||
}
|
||||
|
||||
// IsEmpty 判断队列是否为空
|
||||
func (q *ArrayQueue) IsEmpty() bool {
|
||||
return q.rear-q.front == 0
|
||||
}
|
||||
|
||||
// Offer 入队
|
||||
func (q *ArrayQueue) Offer(v int) {
|
||||
// 当 rear == capacity 表示队列已满
|
||||
@ -824,7 +771,6 @@ comments: true
|
||||
// 尾指针向后移动一位,越过尾部后返回到数组头部
|
||||
q.rear = (q.rear + 1) % q.capacity
|
||||
}
|
||||
|
||||
// Poll 出队
|
||||
func (q *ArrayQueue) Poll() any {
|
||||
if q.IsEmpty() {
|
||||
@ -835,7 +781,6 @@ comments: true
|
||||
q.front = (q.front + 1) % q.capacity
|
||||
return v
|
||||
}
|
||||
|
||||
// Peek 访问队首元素
|
||||
func (q *ArrayQueue) Peek() any {
|
||||
if q.IsEmpty() {
|
||||
@ -851,76 +796,52 @@ comments: true
|
||||
```js title="array_queue.js"
|
||||
/* 基于环形数组实现的队列 */
|
||||
class ArrayQueue {
|
||||
queue; // 用于存储队列元素的数组
|
||||
front = 0; // 头指针,指向队首
|
||||
rear = 0; // 尾指针,指向队尾 + 1
|
||||
CAPACITY = 1e5;
|
||||
|
||||
#queue; // 用于存储队列元素的数组
|
||||
#front = 0; // 头指针,指向队首
|
||||
#rear = 0; // 尾指针,指向队尾 + 1
|
||||
constructor(capacity) {
|
||||
this.queue = new Array(capacity ?? this.CAPACITY);
|
||||
this.#queue = new Array(capacity);
|
||||
}
|
||||
|
||||
/* 获取队列的容量 */
|
||||
get capacity() {
|
||||
return this.queue.length;
|
||||
return this.#queue.length;
|
||||
}
|
||||
|
||||
/* 获取队列的长度 */
|
||||
get size() {
|
||||
// 由于将数组看作为环形,可能 rear < front ,因此需要取余数
|
||||
return (this.capacity + this.rear - this.front) % this.capacity;
|
||||
return (this.capacity + this.#rear - this.#front) % this.capacity;
|
||||
}
|
||||
|
||||
/* 判断队列是否为空 */
|
||||
empty() {
|
||||
return this.rear - this.front == 0;
|
||||
return this.#rear - this.#front == 0;
|
||||
}
|
||||
|
||||
/* 入队 */
|
||||
offer(num) {
|
||||
if (this.size == this.capacity) {
|
||||
console.log("队列已满");
|
||||
return;
|
||||
}
|
||||
if (this.size == this.capacity)
|
||||
throw new Error("队列已满");
|
||||
// 尾结点后添加 num
|
||||
this.queue[this.rear] = num;
|
||||
this.#queue[this.#rear] = num;
|
||||
// 尾指针向后移动一位,越过尾部后返回到数组头部
|
||||
this.rear = (this.rear + 1) % this.capacity;
|
||||
this.#rear = (this.#rear + 1) % this.capacity;
|
||||
}
|
||||
|
||||
/* 出队 */
|
||||
poll() {
|
||||
const num = this.peek();
|
||||
// 队头指针向后移动一位,若越过尾部则返回到数组头部
|
||||
this.front = (this.front + 1) % this.capacity;
|
||||
this.#front = (this.#front + 1) % this.capacity;
|
||||
return num;
|
||||
}
|
||||
|
||||
/* 访问队首元素 */
|
||||
peek() {
|
||||
// 删除头结点
|
||||
if (this.empty())
|
||||
throw new Error("The queue is empty!");
|
||||
return this.queue[this.front];
|
||||
throw new Error("队列为空");
|
||||
return this.#queue[this.#front];
|
||||
}
|
||||
|
||||
/* 访问指定索引元素 */
|
||||
get(index) {
|
||||
if (index >= this.size)
|
||||
throw new Error("Index out of bounds!");
|
||||
return this.queue[(this.front + index) % this.capacity];
|
||||
}
|
||||
|
||||
/* 返回 Array */
|
||||
toArray() {
|
||||
const siz = this.size;
|
||||
const cap = this.capacity;
|
||||
// 仅转换有效长度范围内的列表元素
|
||||
const arr = new Array(siz);
|
||||
for (let i = 0, j = this.front; i < siz; i++, j++) {
|
||||
arr[i] = this.queue[j % cap];
|
||||
}
|
||||
return arr;
|
||||
throw new Error("索引越界");
|
||||
return this.#queue[(this.#front + index) % this.capacity];
|
||||
}
|
||||
}
|
||||
```
|
||||
@ -928,46 +849,37 @@ comments: true
|
||||
=== "TypeScript"
|
||||
|
||||
```typescript title="array_queue.ts"
|
||||
|
||||
/* 基于环形数组实现的队列 */
|
||||
class ArrayQueue {
|
||||
private queue: number[]; // 用于存储队列元素的数组
|
||||
private front: number = 0; // 头指针,指向队首
|
||||
private rear: number = 0; // 尾指针,指向队尾 + 1
|
||||
private CAPACITY: number = 1e5;
|
||||
|
||||
constructor(capacity?: number) {
|
||||
this.queue = new Array<number>(capacity ?? this.CAPACITY);
|
||||
}
|
||||
|
||||
/* 获取队列的容量 */
|
||||
get capacity(): number {
|
||||
return this.queue.length;
|
||||
}
|
||||
|
||||
/* 获取队列的长度 */
|
||||
get size(): number {
|
||||
// 由于将数组看作为环形,可能 rear < front ,因此需要取余数
|
||||
return (this.capacity + this.rear - this.front) % this.capacity;
|
||||
}
|
||||
|
||||
/* 判断队列是否为空 */
|
||||
empty(): boolean {
|
||||
return this.rear - this.front == 0;
|
||||
}
|
||||
|
||||
/* 入队 */
|
||||
offer(num: number): void {
|
||||
if (this.size == this.capacity) {
|
||||
console.log("队列已满");
|
||||
return;
|
||||
}
|
||||
if (this.size == this.capacity)
|
||||
throw new Error("队列已满");
|
||||
// 尾结点后添加 num
|
||||
this.queue[this.rear] = num;
|
||||
// 尾指针向后移动一位,越过尾部后返回到数组头部
|
||||
this.rear = (this.rear + 1) % this.capacity;
|
||||
}
|
||||
|
||||
/* 出队 */
|
||||
poll(): number {
|
||||
const num = this.peek();
|
||||
@ -975,33 +887,18 @@ comments: true
|
||||
this.front = (this.front + 1) % this.capacity;
|
||||
return num;
|
||||
}
|
||||
|
||||
/* 访问队首元素 */
|
||||
peek(): number {
|
||||
// 删除头结点
|
||||
if (this.empty())
|
||||
throw new Error("The queue is empty!");
|
||||
throw new Error("队列为空");
|
||||
return this.queue[this.front];
|
||||
}
|
||||
|
||||
/* 访问指定索引元素 */
|
||||
get(index: number): number {
|
||||
if (index >= this.size)
|
||||
throw new Error("Index out of bounds!");
|
||||
throw new Error("索引越界");
|
||||
return this.queue[(this.front + index) % this.capacity];
|
||||
}
|
||||
|
||||
/* 返回 Array */
|
||||
toArray(): number[] {
|
||||
const siz = this.size;
|
||||
const cap = this.capacity;
|
||||
// 仅转换有效长度范围内的列表元素
|
||||
const arr = new Array(siz);
|
||||
for (let i = 0, j = this.front; i < siz; i++, j++) {
|
||||
arr[i] = this.queue[j % cap];
|
||||
}
|
||||
return arr;
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
|
@ -350,19 +350,16 @@ comments: true
|
||||
// 使用内置包 list 来实现栈
|
||||
data *list.List
|
||||
}
|
||||
|
||||
// NewLinkedListStack 初始化链表
|
||||
func NewLinkedListStack() *LinkedListStack {
|
||||
return &LinkedListStack{
|
||||
data: list.New(),
|
||||
}
|
||||
}
|
||||
|
||||
// Push 入栈
|
||||
func (s *LinkedListStack) Push(value int) {
|
||||
s.data.PushBack(value)
|
||||
}
|
||||
|
||||
// Pop 出栈
|
||||
func (s *LinkedListStack) Pop() any {
|
||||
if s.IsEmpty() {
|
||||
@ -372,7 +369,6 @@ comments: true
|
||||
s.data.Remove(e)
|
||||
return e.Value
|
||||
}
|
||||
|
||||
// Peek 访问栈顶元素
|
||||
func (s *LinkedListStack) Peek() any {
|
||||
if s.IsEmpty() {
|
||||
@ -381,12 +377,10 @@ comments: true
|
||||
e := s.data.Back()
|
||||
return e.Value
|
||||
}
|
||||
|
||||
// Size 获取栈的长度
|
||||
func (s *LinkedListStack) Size() int {
|
||||
return s.data.Len()
|
||||
}
|
||||
|
||||
// IsEmpty 判断栈是否为空
|
||||
func (s *LinkedListStack) IsEmpty() bool {
|
||||
return s.data.Len() == 0
|
||||
@ -613,17 +607,20 @@ comments: true
|
||||
}
|
||||
/* 出栈 */
|
||||
pop() {
|
||||
if (this.empty()) throw "栈为空";
|
||||
if (this.empty())
|
||||
throw new Error("栈为空");
|
||||
return this.stack.pop();
|
||||
}
|
||||
/* 访问栈顶元素 */
|
||||
top() {
|
||||
if (this.empty()) throw "栈为空";
|
||||
if (this.empty())
|
||||
throw new Error("栈为空");
|
||||
return this.stack[this.stack.length - 1];
|
||||
}
|
||||
/* 访问索引 index 处元素 */
|
||||
get(index) {
|
||||
if (index >= this.size) throw "索引越界";
|
||||
if (index >= this.size)
|
||||
throw new Error("索引越界");
|
||||
return this.stack[index];
|
||||
}
|
||||
};
|
||||
@ -652,17 +649,20 @@ comments: true
|
||||
}
|
||||
/* 出栈 */
|
||||
pop(): number | undefined {
|
||||
if (empty()) throw new Error('栈为空');
|
||||
if (this.empty())
|
||||
throw new Error('栈为空');
|
||||
return this.stack.pop();
|
||||
}
|
||||
/* 访问栈顶元素 */
|
||||
top(): number | undefined {
|
||||
if (empty()) throw new Error('栈为空');
|
||||
if (this.empty())
|
||||
throw new Error('栈为空');
|
||||
return this.stack[this.stack.length - 1];
|
||||
}
|
||||
/* 访问索引 index 处元素 */
|
||||
get(index: number): number | undefined {
|
||||
if (index >= size()) throw new Error('索引越界');
|
||||
if (index >= this.size)
|
||||
throw new Error('索引越界');
|
||||
return this.stack[index];
|
||||
}
|
||||
};
|
||||
|
Loading…
x
Reference in New Issue
Block a user