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Add the codes of hashmap (#553)

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of chaining and open addressing
This commit is contained in:
Yudong Jin
2023-06-14 02:01:06 +08:00
committed by GitHub
parent d3e597af94
commit 9563965a20
27 changed files with 1280 additions and 207 deletions
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28
codes/csharp/chapter_hashing/array_hash_map.cs
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@ -7,10 +7,10 @@
namespace hello_algo.chapter_hashing;
/* 键值对 int->string */
class Entry {
class Pair {
public int key;
public string val;
public Entry(int key, string val) {
public Pair(int key, string val) {
this.key = key;
this.val = val;
}
@ -18,7 +18,7 @@ class Entry {
/* 基于数组简易实现的哈希表 */
class ArrayHashMap {
private List<Entry?> buckets;
private List<Pair?> buckets;
public ArrayHashMap() {
// 初始化数组，包含 100 个桶
buckets = new();
@ -36,14 +36,14 @@ class ArrayHashMap {
/* 查询操作 */
public string? get(int key) {
int index = hashFunc(key);
Entry? pair = buckets[index];
Pair? pair = buckets[index];
if (pair == null) return null;
return pair.val;
}
/* 添加操作 */
public void put(int key, string val) {
Entry pair = new Entry(key, val);
Pair pair = new Pair(key, val);
int index = hashFunc(key);
buckets[index] = pair;
}
@ -56,19 +56,19 @@ class ArrayHashMap {
}
/* 获取所有键值对 */
public List<Entry> entrySet() {
List<Entry> entrySet = new();
foreach (Entry? pair in buckets) {
public List<Pair> pairSet() {
List<Pair> pairSet = new();
foreach (Pair? pair in buckets) {
if (pair != null)
entrySet.Add(pair);
pairSet.Add(pair);
}
return entrySet;
return pairSet;
}
/* 获取所有键 */
public List<int> keySet() {
List<int> keySet = new();
foreach (Entry? pair in buckets) {
foreach (Pair? pair in buckets) {
if (pair != null)
keySet.Add(pair.key);
}
@ -78,7 +78,7 @@ class ArrayHashMap {
/* 获取所有值 */
public List<string> valueSet() {
List<string> valueSet = new();
foreach (Entry? pair in buckets) {
foreach (Pair? pair in buckets) {
if (pair != null)
valueSet.Add(pair.val);
}
@ -87,7 +87,7 @@ class ArrayHashMap {
/* 打印哈希表 */
public void print() {
foreach (Entry kv in entrySet()) {
foreach (Pair kv in pairSet()) {
Console.WriteLine(kv.key + " -> " + kv.val);
}
}
@ -123,7 +123,7 @@ public class array_hash_map {
/* 遍历哈希表 */
Console.WriteLine("\n遍历键值对 Key->Value");
foreach (Entry kv in map.entrySet()) {
foreach (Pair kv in map.pairSet()) {
Console.WriteLine(kv.key + " -> " + kv.val);
}
Console.WriteLine("\n单独遍历键 Key");