diff --git a/.gitignore b/.gitignore index 70b2f49fe..3ff305496 100644 --- a/.gitignore +++ b/.gitignore @@ -13,3 +13,6 @@ docs/overrides/ # python files __pycache__ + +# iml +hello-algo.iml diff --git a/codes/typescript/chapter_hashing/array_hash_map.ts b/codes/typescript/chapter_hashing/array_hash_map.ts new file mode 100644 index 000000000..627205f7f --- /dev/null +++ b/codes/typescript/chapter_hashing/array_hash_map.ts @@ -0,0 +1,136 @@ +/* + * File: array_hash_map.ts + * Created Time: 2022-12-20 + * Author: Daniel (better.sunjian@gmail.com) + */ + +/* 键值对 Number -> String */ +class Entry { + public key: number; + public val: string; + + constructor(key: number, val: string) { + this.key = key; + this.val = val; + } +} + +/* 基于数组简易实现的哈希表 */ +class ArrayHashMap { + + private readonly bucket: (Entry | null)[]; + + constructor() { + // 初始化一个长度为 100 的桶(数组) + this.bucket = (new Array(100)).fill(null); + } + + /* 哈希函数 */ + private hashFunc(key: number): number { + return key % 100; + } + + /* 查询操作 */ + public get(key: number): string | null { + let index = this.hashFunc(key); + let entry = this.bucket[index]; + if (entry === null) return null; + return entry.val; + } + + /* 添加操作 */ + public set(key: number, val: string) { + let index = this.hashFunc(key); + this.bucket[index] = new Entry(key, val); + } + + /* 删除操作 */ + public delete(key: number) { + let index = this.hashFunc(key); + // 置为 null ,代表删除 + this.bucket[index] = null; + } + + /* 获取所有键值对 */ + public entries(): (Entry | null)[] { + let arr: (Entry | null)[] = []; + for (let i = 0; i < this.bucket.length; i++) { + if (this.bucket[i]) { + arr.push(this.bucket[i]); + } + } + return arr; + } + + /* 获取所有键 */ + public keys(): (number | undefined)[] { + let arr: (number | undefined)[] = []; + for (let i = 0; i < this.bucket.length; i++) { + if (this.bucket[i]) { + arr.push(this.bucket[i]?.key); + } + } + return arr; + } + + /* 获取所有值 */ + public values(): (string | undefined)[] { + let arr: (string | undefined)[] = []; + for (let i = 0; i < this.bucket.length; i++) { + if (this.bucket[i]) { + arr.push(this.bucket[i]?.val); + } + } + return arr; + } + + /* 打印哈希表 */ + public print() { + let entrySet = this.entries(); + for (const entry of entrySet) { + if (!entry) continue; + console.info(`${entry.key} -> ${entry.val}`); + } + } +} + +/* Driver Code */ +/* 初始化哈希表 */ +const map = new ArrayHashMap(); +/* 添加操作 */ +// 在哈希表中添加键值对 (key, value) +map.set(12836, '小哈'); +map.set(15937, '小啰'); +map.set(16750, '小算'); +map.set(13276, '小法'); +map.set(10583, '小鸭'); +console.info('\n添加完成后,哈希表为\nKey -> Value'); +map.print(); + +/* 查询操作 */ +// 向哈希表输入键 key ,得到值 value +let name = map.get(15937); +console.info('\n输入学号 15937 ,查询到姓名 ' + name); + +/* 删除操作 */ +// 在哈希表中删除键值对 (key, value) +map.delete(10583); +console.info('\n删除 10583 后,哈希表为\nKey -> Value'); +map.print(); + +/* 遍历哈希表 */ +console.info('\n遍历键值对 Key->Value'); +for (const entry of map.entries()) { + if (!entry) continue; + console.info(entry.key + ' -> ' + entry.val); +} +console.info('\n单独遍历键 Key'); +for (const key of map.keys()) { + console.info(key); +} +console.info('\n单独遍历值 Value'); +for (const val of map.values()) { + console.info(val); +} + +export {}; diff --git a/codes/typescript/chapter_hashing/hash_map.ts b/codes/typescript/chapter_hashing/hash_map.ts new file mode 100644 index 000000000..7e54cf5cb --- /dev/null +++ b/codes/typescript/chapter_hashing/hash_map.ts @@ -0,0 +1,44 @@ +/* + * File: hash_map.ts + * Created Time: 2022-12-20 + * Author: Daniel (better.sunjian@gmail.com) + */ + +/* Driver Code */ +/* 初始化哈希表 */ +const map = new Map(); + +/* 添加操作 */ +// 在哈希表中添加键值对 (key, value) +map.set(12836, '小哈'); +map.set(15937, '小啰'); +map.set(16750, '小算'); +map.set(13276, '小法'); +map.set(10583, '小鸭'); +console.info('\n添加完成后,哈希表为\nKey -> Value'); +console.info(map); + +/* 查询操作 */ +// 向哈希表输入键 key ,得到值 value +let name = map.get(15937); +console.info('\n输入学号 15937 ,查询到姓名 ' + name); + +/* 删除操作 */ +// 在哈希表中删除键值对 (key, value) +map.delete(10583); +console.info('\n删除 10583 后,哈希表为\nKey -> Value'); +console.info(map); + +/* 遍历哈希表 */ +console.info('\n遍历键值对 Key->Value'); +for (const [k, v] of map.entries()) { + console.info(k + ' -> ' + v); +} +console.info('\n单独遍历键 Key'); +for (const k of map.keys()) { + console.info(k); +} +console.info('\n单独遍历值 Value'); +for (const v of map.values()) { + console.info(v); +} diff --git a/docs/chapter_hashing/hash_map.md b/docs/chapter_hashing/hash_map.md index b51a1da91..800482030 100644 --- a/docs/chapter_hashing/hash_map.md +++ b/docs/chapter_hashing/hash_map.md @@ -138,7 +138,28 @@ comments: true === "TypeScript" ```typescript title="hash_map.ts" + /* 初始化哈希表 */ + const map = new Map(); + /* 添加操作 */ + // 在哈希表中添加键值对 (key, value) + map.set(12836, '小哈'); + map.set(15937, '小啰'); + map.set(16750, '小算'); + map.set(13276, '小法'); + map.set(10583, '小鸭'); + console.info('\n添加完成后,哈希表为\nKey -> Value'); + console.info(map); + /* 查询操作 */ + // 向哈希表输入键 key ,得到值 value + let name = map.get(15937); + console.info('\n输入学号 15937 ,查询到姓名 ' + name); + + /* 删除操作 */ + // 在哈希表中删除键值对 (key, value) + map.delete(10583); + console.info('\n删除 10583 后,哈希表为\nKey -> Value'); + console.info(map); ``` === "C" @@ -250,7 +271,19 @@ comments: true === "TypeScript" ```typescript title="hash_map.ts" - + /* 遍历哈希表 */ + console.info('\n遍历键值对 Key->Value'); + for (const [k, v] of map.entries()) { + console.info(k + ' -> ' + v); + } + console.info('\n单独遍历键 Key'); + for (const k of map.keys()) { + console.info(k); + } + console.info('\n单独遍历值 Value'); + for (const v of map.values()) { + console.info(v); + } ``` === "C" @@ -506,7 +539,86 @@ $$ === "TypeScript" ```typescript title="array_hash_map.ts" - + /* 键值对 Number -> String */ + class Entry { + public key: number; + public val: string; + + constructor(key: number, val: string) { + this.key = key; + this.val = val; + } + } + + /* 基于数组简易实现的哈希表 */ + class ArrayHashMap { + + private readonly bucket: (Entry | null)[]; + + constructor() { + // 初始化一个长度为 100 的桶(数组) + this.bucket = (new Array(100)).fill(null); + } + + /* 哈希函数 */ + private hashFunc(key: number): number { + return key % 100; + } + + /* 查询操作 */ + public get(key: number): string | null { + let index = this.hashFunc(key); + let entry = this.bucket[index]; + if (entry === null) return null; + return entry.val; + } + + /* 添加操作 */ + public set(key: number, val: string) { + let index = this.hashFunc(key); + this.bucket[index] = new Entry(index, val); + } + + /* 删除操作 */ + public delete(key: number) { + let index = this.hashFunc(key); + // 置为 null ,代表删除 + this.bucket[index] = null; + } + + /* 获取所有键值对 */ + public entries(): (Entry | null)[] { + let arr: (Entry | null)[] = []; + for (let i = 0; i < this.bucket.length; i++) { + if (this.bucket[i]) { + arr.push(this.bucket[i]); + } + } + return arr; + } + + /* 获取所有键 */ + public keys(): (number | undefined)[] { + let arr: (number | undefined)[] = []; + for (let i = 0; i < this.bucket.length; i++) { + if (this.bucket[i]) { + arr.push(this.bucket[i]?.key); + } + } + return arr; + } + + /* 获取所有值 */ + public values(): (string | undefined)[] { + let arr: (string | undefined)[] = []; + for (let i = 0; i < this.bucket.length; i++) { + if (this.bucket[i]) { + arr.push(this.bucket[i]?.val); + } + } + return arr; + } + } ``` === "C"