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Add JavaScript and TypeScript code and docs for Section Space Complexity (#331)
* Fix bug before commit 5eae708 * Update queue.md * Update the coding style for JavaScript * Add JavaScript and TypeScript code for Section Space Complexity * Add JavaScript and TypeScript code to docs for Section Space Complexity * Update hashing_search.js --------- Co-authored-by: Yudong Jin <krahets@163.com>
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/**
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* File: space_complexity.js
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* Created Time: 2023-02-05
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* Author: Justin (xiefahit@gmail.com)
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*/
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const { ListNode } = require('../include/ListNode');
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const { TreeNode } = require('../include/TreeNode');
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const { printTree } = require('../include/PrintUtil');
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/* 函数 */
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function constFunc() {
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// do something
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return 0;
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}
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/* 常数阶 */
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function constant(n) {
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// 常量、变量、对象占用 O(1) 空间
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const a = 0;
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const b = 0;
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const nums = new Array(10000);
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const node = new ListNode(0);
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// 循环中的变量占用 O(1) 空间
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for (let i = 0; i < n; i++) {
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const c = 0;
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}
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// 循环中的函数占用 O(1) 空间
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for (let i = 0; i < n; i++) {
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constFunc();
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}
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}
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/* 线性阶 */
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function linear(n) {
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// 长度为 n 的数组占用 O(n) 空间
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const nums = new Array(n);
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// 长度为 n 的列表占用 O(n) 空间
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const nodes = [];
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for (let i = 0; i < n; i++) {
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nodes.push(new ListNode(i));
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}
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// 长度为 n 的哈希表占用 O(n) 空间
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const map = new Map();
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for (let i = 0; i < n; i++) {
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map.set(i, i.toString());
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}
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}
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/* 线性阶(递归实现) */
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function linearRecur(n) {
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console.log(`递归 n = ${n}`);
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if (n === 1) return;
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linearRecur(n - 1);
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}
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/* 平方阶 */
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function quadratic(n) {
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// 矩阵占用 O(n^2) 空间
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const numMatrix = Array(n).fill(null).map(() => Array(n).fill(null));
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// 二维列表占用 O(n^2) 空间
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const numList = [];
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for (let i = 0; i < n; i++) {
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const tmp = [];
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for (let j = 0; j < n; j++) {
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tmp.push(0);
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}
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numList.push(tmp);
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}
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}
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/* 平方阶(递归实现) */
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function quadraticRecur(n) {
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if (n <= 0) return 0;
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const nums = new Array(n);
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console.log(`递归 n = ${n} 中的 nums 长度 = ${nums.length}`);
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return quadraticRecur(n - 1);
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}
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/* 指数阶(建立满二叉树) */
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function buildTree(n) {
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if (n === 0) return null;
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const root = new TreeNode(0);
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root.left = buildTree(n - 1);
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root.right = buildTree(n - 1);
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return root;
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}
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/* Driver Code */
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const n = 5;
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// 常数阶
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constant(n);
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// 线性阶
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linear(n);
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linearRecur(n);
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// 平方阶
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quadratic(n);
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quadraticRecur(n);
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// 指数阶
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const root = buildTree(n);
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printTree(root);
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