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https://github.com/krahets/hello-algo.git
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Add C++, Python, Go code for chapter_hashing
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96
codes/go/chapter_hashing/array_hash_map.go
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96
codes/go/chapter_hashing/array_hash_map.go
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// File: array_hash_map.go
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// Created Time: 2022-12-14
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// Author: msk397 (machangxinq@gmail.com)
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package chapter_hashing
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import "fmt"
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// 键值对 int->String
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type Entry struct {
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key int
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val string
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}
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// 基于数组简易实现的哈希表
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type ArrayHashMap struct {
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bucket []Entry
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}
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func newArrayHashMap() *ArrayHashMap {
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// 初始化一个长度为 100 的桶(数组)
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bucket := make([]Entry, 100)
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return &ArrayHashMap{bucket: bucket}
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}
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// 哈希函数
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func (a *ArrayHashMap) hashFunc(key int) int {
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index := key % 100
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return index
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}
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// 查询操作
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func (a *ArrayHashMap) get(key int) string {
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index := a.hashFunc(key)
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pair := a.bucket[index]
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if pair.key == 0 {
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return ""
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}
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return pair.val
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}
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// 添加操作
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func (a *ArrayHashMap) put(key int, val string) {
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pair := Entry{key: key, val: val}
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index := a.hashFunc(key)
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a.bucket[index] = pair
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}
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// 删除操作
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func (a *ArrayHashMap) remove(key int) {
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index := a.hashFunc(key)
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// 置为空字符,代表删除
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a.bucket[index] = Entry{}
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}
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// 获取所有键对
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func (a *ArrayHashMap) entrySet() []Entry {
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var pairs []Entry
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for _, pair := range a.bucket {
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if pair.key != 0 {
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pairs = append(pairs, pair)
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}
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}
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return pairs
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}
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// 获取所有键
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func (a *ArrayHashMap) keySet() []int {
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var keys []int
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for _, pair := range a.bucket {
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if pair.key != 0 {
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keys = append(keys, pair.key)
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}
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}
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return keys
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}
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// 获取所有值
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func (a *ArrayHashMap) valueSet() []string {
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var values []string
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for _, pair := range a.bucket {
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if pair.key != 0 {
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values = append(values, pair.val)
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}
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}
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return values
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}
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// 打印哈希表
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func (a *ArrayHashMap) print() {
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for _, pair := range a.bucket {
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if pair.key != 0 {
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fmt.Println(pair.key, "->", pair.val)
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}
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}
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}
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52
codes/go/chapter_hashing/array_hash_map_test.go
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52
codes/go/chapter_hashing/array_hash_map_test.go
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@@ -0,0 +1,52 @@
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// File: array_hash_map_test.go
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// Created Time: 2022-12-14
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// Author: msk397 (machangxinq@gmail.com)
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package chapter_hashing
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import (
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"fmt"
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"testing"
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)
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func TestArrayHashMap(t *testing.T) {
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/* 初始化哈希表 */
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map1 := newArrayHashMap()
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/* 添加操作 */
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// 在哈希表中添加键值对 (key, value)
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map1.put(12836, "小哈")
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map1.put(15937, "小啰")
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map1.put(16750, "小算")
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map1.put(13276, "小法")
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map1.put(10583, "小鸭")
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fmt.Println("\n添加完成后,哈希表为\nKey -> Value")
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map1.print()
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/* 查询操作 */
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// 向哈希表输入键 key ,得到值 value
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name := map1.get(15937)
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fmt.Println("\n输入学号 15937 ,查询到姓名 " + name)
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/* 删除操作 */
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// 在哈希表中删除键值对 (key, value)
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map1.remove(10583)
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fmt.Println("\n删除 10583 后,哈希表为\nKey -> Value")
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map1.print()
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/* 遍历哈希表 */
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fmt.Println("\n遍历键值对 Key->Value")
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for _, kv := range map1.entrySet() {
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fmt.Println(kv.key, " -> ", kv.val)
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}
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fmt.Println("\n单独遍历键 Key")
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for _, key := range map1.keySet() {
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fmt.Println(key)
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}
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fmt.Println("\n单独遍历值 Value")
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for _, val := range map1.valueSet() {
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fmt.Println(val)
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}
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}
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57
codes/go/chapter_hashing/hash_map_test.go
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57
codes/go/chapter_hashing/hash_map_test.go
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@@ -0,0 +1,57 @@
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// File: hash_map_test.go
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// Created Time: 2022-12-14
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// Author: msk397 (machangxinq@gmail.com)
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package chapter_hashing
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import (
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"fmt"
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"testing"
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)
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func TestHashmap(t *testing.T) {
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// 初始化哈希表
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Map := make(map[int]string)
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// 添加操作
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// 在哈希表中添加键值对 (key, value)
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Map[12836] = "小哈"
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Map[15937] = "小啰"
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Map[16750] = "小算"
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Map[13276] = "小法"
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Map[10583] = "小鸭"
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fmt.Println("\n添加完成后,哈希表为\nKey -> Value")
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for key, value := range Map {
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fmt.Printf("%d -> %s\n", key, value)
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}
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// 查询操作
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// 向哈希表输入键 key ,得到值 value
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name := Map[15937]
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fmt.Println("\n输入学号 15937 ,查询到姓名 ", name)
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// 删除操作
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// 在哈希表中删除键值对 (key, value)
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delete(Map, 10583)
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fmt.Println("\n删除 10583 后,哈希表为\nKey -> Value")
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for key, value := range Map {
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fmt.Printf("%d -> %s\n", key, value)
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}
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/* 遍历哈希表 */
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// 遍历键值对 key->value
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fmt.Println("\n遍历键值对 Key->Value")
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for key, value := range Map {
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fmt.Println(key, "->", value)
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}
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// 单独遍历键 key
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fmt.Println("\n单独遍历键 Key")
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for key := range Map {
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fmt.Println(key)
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}
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// 单独遍历值 value
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fmt.Println("\n单独遍历值 Value")
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for _, value := range Map {
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fmt.Println(value)
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}
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}
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