mirror of
https://github.com/krahets/hello-algo.git
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e720aa2d24
* Sync recent changes to the revised Word. * Revised the preface chapter * Revised the introduction chapter * Revised the computation complexity chapter * Revised the chapter data structure * Revised the chapter array and linked list * Revised the chapter stack and queue * Revised the chapter hashing * Revised the chapter tree * Revised the chapter heap * Revised the chapter graph * Revised the chapter searching * Reivised the sorting chapter * Revised the divide and conquer chapter * Revised the chapter backtacking * Revised the DP chapter * Revised the greedy chapter * Revised the appendix chapter * Revised the preface chapter doubly * Revised the figures
97 lines
1.7 KiB
Go
97 lines
1.7 KiB
Go
// 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 */
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type pair struct {
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key int
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val string
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}
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/* 基于数组实现的哈希表 */
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type arrayHashMap struct {
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buckets []*pair
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}
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/* 初始化哈希表 */
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func newArrayHashMap() *arrayHashMap {
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// 初始化数组，包含 100 个桶
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buckets := make([]*pair, 100)
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return &arrayHashMap{buckets: buckets}
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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.buckets[index]
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if pair == nil {
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return "Not Found"
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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 := &pair{key: key, val: val}
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index := a.hashFunc(key)
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a.buckets[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 nil ，代表删除
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a.buckets[index] = nil
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}
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/* 获取所有键对 */
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func (a *arrayHashMap) pairSet() []*pair {
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var pairs []*pair
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for _, pair := range a.buckets {
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if pair != nil {
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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.buckets {
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if pair != nil {
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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.buckets {
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if pair != nil {
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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.buckets {
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if pair != nil {
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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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