diff --git a/codes/javascript/chapter_stack_and_queue/deque.js b/codes/javascript/chapter_stack_and_queue/deque.js new file mode 100644 index 0000000000..aadab852ed --- /dev/null +++ b/codes/javascript/chapter_stack_and_queue/deque.js @@ -0,0 +1,39 @@ +/** + * File: deque.js + * Created Time: 2023-01-17 + * Author: Zhuo Qinyue (1403450829@qq.com) + */ + +/* 初始化双向队列 */ +/* JavaScript 没有内置的双端队列,可以把 Array 当作双端队列来使用 */ +const deque = []; + +/* 元素入队 */ +deque.push(2); +deque.push(5); +deque.push(4); +/* unshift() 方法的时间复杂度为 O(n) */ +deque.unshift(3); +deque.unshift(1); +console.log("双向队列 deque = ", deque); + +/* 访问元素 */ +const peekFirst = deque[0]; +console.log("队首元素 peekFirst = " + peekFirst); +const peekLast = deque[deque.length - 1]; +console.log("队尾元素 peekLast = " + peekLast); + +/* 元素出队 */ +/* shift() 方法的时间复杂度为 O(n) */ +const popFront = deque.shift(); +console.log("队首出队元素 popFront = " + popFront + ",队首出队后 deque = " + deque); +const popBack = deque.pop(); +console.log("队尾出队元素 popBack = " + popBack + ",队尾出队后 deque = " + deque); + +/* 获取双向队列的长度 */ +const size = deque.length; +console.log("双向队列长度 size = " + size); + +/* 判断双向队列是否为空 */ +const isEmpty = size === 0; +console.log("双向队列是否为空 = " + isEmpty); \ No newline at end of file diff --git a/codes/typescript/chapter_stack_and_queue/deque.ts b/codes/typescript/chapter_stack_and_queue/deque.ts new file mode 100644 index 0000000000..16190ee018 --- /dev/null +++ b/codes/typescript/chapter_stack_and_queue/deque.ts @@ -0,0 +1,41 @@ +/** + * File: deque.ts + * Created Time: 2023-01-17 + * Author: Zhuo Qinyue (1403450829@qq.com) + */ + +/* 初始化双向队列 */ +/* JavaScript 没有内置的双端队列,可以把 Array 当作双端队列来使用 */ +const deque: number[] = []; + +/* 元素入队 */ +deque.push(2); +deque.push(5); +deque.push(4); +/* unshift() 方法的时间复杂度为 O(n) */ +deque.unshift(3); +deque.unshift(1); +console.log("双向队列 deque = ", deque); + +/* 访问元素 */ +const peekFirst: number = deque[0]; +console.log("队首元素 peekFirst = " + peekFirst); +const peekLast: number = deque[deque.length - 1]; +console.log("队尾元素 peekLast = " + peekLast); + +/* 元素出队 */ +/* shift() 方法的时间复杂度为 O(n) */ +const popFront: number = deque.shift() as number; +console.log("队首出队元素 popFront = " + popFront + ",队首出队后 deque = " + deque); +const popBack: number = deque.pop() as number; +console.log("队尾出队元素 popBack = " + popBack + ",队尾出队后 deque = " + deque); + +/* 获取双向队列的长度 */ +const size: number = deque.length; +console.log("双向队列长度 size = " + size); + +/* 判断双向队列是否为空 */ +const isEmpty: boolean = size === 0; +console.log("双向队列是否为空 = " + isEmpty); + +export {}; \ No newline at end of file