xmengnet/hello-algo
1
0
Fork 0
mirror of https://github.com/krahets/hello-algo.git synced 2024-12-25 22:16:29 +08:00
Code Issues Projects Releases Packages Wiki Activity Actions

Fixed some problems, indentation and Pointer

Browse source
This commit is contained in:
machangxin 2022-12-15 09:43:20 +08:00
parent 148dbaa0a1
commit 1229f98e92
9 changed files with 185 additions and 175 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

43
codes/cpp/chapter_hashing/array_hash_map.cpp
View file

@ -15,17 +15,16 @@ public:
this->key = key; this->key = key;
this->val = val; this->val = val;
} }
Entry()=default;
}; };
/* 基于数组简易实现的哈希表 */ /* 基于数组简易实现的哈希表 */
class ArrayHashMap { class ArrayHashMap {
private: private:
vector<Entry> bucket; vector<Entry*> bucket;
public: public:
ArrayHashMap() { ArrayHashMap() {
// 初始化一个长度为 100 的桶（数组） // 初始化一个长度为 100 的桶（数组）
bucket= vector<Entry>(100); bucket= vector<Entry*>(100);
} }
/* 哈希函数 */ /* 哈希函数 */
@ -37,13 +36,16 @@ public:
/* 查询操作 */ /* 查询操作 */
string get(int key) { string get(int key) {
int index = hashFunc(key); int index = hashFunc(key);
Entry pair = bucket[index]; Entry* pair = bucket[index];
return pair.val; if (pair == nullptr) {
return "Not Found";
}
return pair->val;
} }
/* 添加操作 */ /* 添加操作 */
void put(int key, string val) { void put(int key, string val) {
Entry pair = Entry(key, val); Entry* pair = new Entry(key, val);
int index = hashFunc(key); int index = hashFunc(key);
bucket[index] = pair; bucket[index] = pair;
} }
@ -52,14 +54,14 @@ public:
void remove(int key) { void remove(int key) {
int index = hashFunc(key); int index = hashFunc(key);
// 置为空字符，代表删除 // 置为空字符，代表删除
bucket[index] = *new Entry(); bucket[index] = nullptr;
} }
/* 获取所有键值对 */ /* 获取所有键值对 */
vector<Entry> entrySet() { vector<Entry*> entrySet() {
vector<Entry> entrySet; vector<Entry*> entrySet;
for (Entry pair: bucket) { for (Entry* pair: bucket) {
if (pair.key != 0) { if (pair != nullptr) {
entrySet.push_back(pair); entrySet.push_back(pair);
} }
} }
@ -69,9 +71,9 @@ public:
/* 获取所有键 */ /* 获取所有键 */
vector<int> keySet() { vector<int> keySet() {
vector<int> keySet; vector<int> keySet;
for (Entry pair: bucket) { for (Entry* pair: bucket) {
if (pair.key != 0) { if (pair != nullptr) {
keySet.push_back(pair.key); keySet.push_back(pair->key);
} }
} }
return keySet; return keySet;
@ -80,17 +82,18 @@ public:
/* 获取所有值 */ /* 获取所有值 */
vector<string> valueSet() { vector<string> valueSet() {
vector<string> valueSet; vector<string> valueSet;
for (Entry pair: bucket) { for (Entry* pair: bucket) {
if (pair.key != 0) if (pair != nullptr){
valueSet.push_back(pair.val); valueSet.push_back(pair->val);
}
} }
return valueSet; return valueSet;
} }
/* 打印哈希表 */ /* 打印哈希表 */
void print() { void print() {
for (Entry kv: entrySet()) { for (Entry* kv: entrySet()) {
cout << kv.key << " -> " << kv.val << endl; cout << kv->key << " -> " << kv->val << endl;
} }
} }
}; };
@ -122,7 +125,7 @@ int main() {
/* 遍历哈希表 */ /* 遍历哈希表 */
cout << "\n遍历键值对 Key->Value" << endl; cout << "\n遍历键值对 Key->Value" << endl;
for (auto kv: map.entrySet()) { for (auto kv: map.entrySet()) {
cout << kv.key << " -> " << kv.val << endl; cout << kv->key << " -> " << kv->val << endl;
} }
cout << "\n单独遍历键 Key" << endl; cout << "\n单独遍历键 Key" << endl;

44
codes/go/chapter_hashing/array_hash_map.go
View file

@ -6,90 +6,90 @@ package chapter_hashing
import "fmt" import "fmt"
// 键值对 int->String /* 键值对 int->String */
type Entry struct { type Entry struct {
key int key int
val string val string
} }
// 基于数组简易实现的哈希表 /* 基于数组简易实现的哈希表 */
type ArrayHashMap struct { type ArrayHashMap struct {
bucket []Entry bucket []*Entry
} }
func newArrayHashMap() *ArrayHashMap { func newArrayHashMap() *ArrayHashMap {
// 初始化一个长度为 100 的桶（数组） // 初始化一个长度为 100 的桶（数组）
bucket := make([]Entry, 100) bucket := make([]*Entry, 100)
return &ArrayHashMap{bucket: bucket} return &ArrayHashMap{bucket: bucket}
} }
// 哈希函数 /* 哈希函数 */
func (a *ArrayHashMap) hashFunc(key int) int { func (a *ArrayHashMap) hashFunc(key int) int {
index := key % 100 index := key % 100
return index return index
} }
// 查询操作 /* 查询操作 */
func (a *ArrayHashMap) get(key int) string { func (a *ArrayHashMap) get(key int) string {
index := a.hashFunc(key) index := a.hashFunc(key)
pair := a.bucket[index] pair := a.bucket[index]
if pair.key == 0 { if pair == nil {
return "" return "Not Found"
} }
return pair.val return pair.val
} }
// 添加操作 /* 添加操作 */
func (a *ArrayHashMap) put(key int, val string) { func (a *ArrayHashMap) put(key int, val string) {
pair := Entry{key: key, val: val} pair := &Entry{key: key, val: val}
index := a.hashFunc(key) index := a.hashFunc(key)
a.bucket[index] = pair a.bucket[index] = pair
} }
// 删除操作 /* 删除操作 */
func (a *ArrayHashMap) remove(key int) { func (a *ArrayHashMap) remove(key int) {
index := a.hashFunc(key) index := a.hashFunc(key)
// 置为空字符，代表删除 // 置为空字符，代表删除
a.bucket[index] = Entry{} a.bucket[index] = nil
} }
// 获取所有键对 /* 获取所有键对 */
func (a *ArrayHashMap) entrySet() []Entry { func (a *ArrayHashMap) entrySet() []*Entry {
var pairs []Entry var pairs []*Entry
for _, pair := range a.bucket { for _, pair := range a.bucket {
if pair.key != 0 { if pair != nil {
pairs = append(pairs, pair) pairs = append(pairs, pair)
} }
} }
return pairs return pairs
} }
// 获取所有键 /* 获取所有键 */
func (a *ArrayHashMap) keySet() []int { func (a *ArrayHashMap) keySet() []int {
var keys []int var keys []int
for _, pair := range a.bucket { for _, pair := range a.bucket {
if pair.key != 0 { if pair != nil {
keys = append(keys, pair.key) keys = append(keys, pair.key)
} }
} }
return keys return keys
} }
// 获取所有值 /* 获取所有值 */
func (a *ArrayHashMap) valueSet() []string { func (a *ArrayHashMap) valueSet() []string {
var values []string var values []string
for _, pair := range a.bucket { for _, pair := range a.bucket {
if pair.key != 0 { if pair != nil {
values = append(values, pair.val) values = append(values, pair.val)
} }
} }
return values return values
} }
// 打印哈希表 /* 打印哈希表 */
func (a *ArrayHashMap) print() { func (a *ArrayHashMap) print() {
for _, pair := range a.bucket { for _, pair := range a.bucket {
if pair.key != 0 { if pair != nil {
fmt.Println(pair.key, "->", pair.val) fmt.Println(pair.key, "->", pair.val)
} }
} }

27
codes/go/chapter_hashing/array_hash_map_test.go
View file

@ -11,42 +11,43 @@ import (
func TestArrayHashMap(t *testing.T) { func TestArrayHashMap(t *testing.T) {
/* 初始化哈希表 */ /* 初始化哈希表 */
map1 := newArrayHashMap() mapp := newArrayHashMap()
/* 添加操作 */ /* 添加操作 */
// 在哈希表中添加键值对 (key, value) // 在哈希表中添加键值对 (key, value)
map1.put(12836, "小哈") mapp.put(12836, "小哈")
map1.put(15937, "小啰") mapp.put(15937, "小啰")
map1.put(16750, "小算") mapp.put(16750, "小算")
map1.put(13276, "小法") mapp.put(13276, "小法")
map1.put(10583, "小鸭") mapp.put(10583, "小鸭")
fmt.Println("\n添加完成后，哈希表为\nKey -> Value") fmt.Println("\n添加完成后，哈希表为\nKey -> Value")
map1.print() mapp.print()
/* 查询操作 */ /* 查询操作 */
// 向哈希表输入键 key ，得到值 value // 向哈希表输入键 key ，得到值 value
name := map1.get(15937) name := mapp.get(15937)
fmt.Println("\n输入学号 15937 ，查询到姓名 " + name) fmt.Println("\n输入学号 15937 ，查询到姓名 " + name)
/* 删除操作 */ /* 删除操作 */
// 在哈希表中删除键值对 (key, value) // 在哈希表中删除键值对 (key, value)
map1.remove(10583) mapp.remove(10583)
fmt.Println("\n删除 10583 后，哈希表为\nKey -> Value") fmt.Println("\n删除 10583 后，哈希表为\nKey -> Value")
map1.print() mapp.print()
/* 遍历哈希表 */ /* 遍历哈希表 */
fmt.Println("\n遍历键值对 Key->Value") fmt.Println("\n遍历键值对 Key->Value")
for _, kv := range map1.entrySet() { for _, kv := range mapp.entrySet() {
fmt.Println(kv.key, " -> ", kv.val) fmt.Println(kv.key, " -> ", kv.val)
} }
fmt.Println("\n单独遍历键 Key") fmt.Println("\n单独遍历键 Key")
for _, key := range map1.keySet() { for _, key := range mapp.keySet() {
fmt.Println(key) fmt.Println(key)
} }
fmt.Println("\n单独遍历值 Value") fmt.Println("\n单独遍历值 Value")
for _, val := range map1.valueSet() { for _, val := range mapp.valueSet() {
fmt.Println(val) fmt.Println(val)
} }
} }

34
codes/go/chapter_hashing/hash_map_test.go
View file

@ -10,48 +10,48 @@ import (
) )
func TestHashmap(t *testing.T) { func TestHashmap(t *testing.T) {
// 初始化哈希表 /* 初始化哈希表 */
Map := make(map[int]string) mapp := make(map[int]string)
// 添加操作 /* 添加操作 */
// 在哈希表中添加键值对 (key, value) // 在哈希表中添加键值对 (key, value)
Map[12836] = "小哈" mapp[12836] = "小哈"
Map[15937] = "小啰" mapp[15937] = "小啰"
Map[16750] = "小算" mapp[16750] = "小算"
Map[13276] = "小法" mapp[13276] = "小法"
Map[10583] = "小鸭" mapp[10583] = "小鸭"
fmt.Println("\n添加完成后，哈希表为\nKey -> Value") fmt.Println("\n添加完成后，哈希表为\nKey -> Value")
for key, value := range Map { for key, value := range mapp {
fmt.Printf("%d -> %s\n", key, value) fmt.Printf("%d -> %s\n", key, value)
} }
// 查询操作 /* 查询操作 */
// 向哈希表输入键 key ，得到值 value // 向哈希表输入键 key ，得到值 value
name := Map[15937] name := mapp[15937]
fmt.Println("\n输入学号 15937 ，查询到姓名 ", name) fmt.Println("\n输入学号 15937 ，查询到姓名 ", name)
// 删除操作 /* 删除操作 */
// 在哈希表中删除键值对 (key, value) // 在哈希表中删除键值对 (key, value)
delete(Map, 10583) delete(mapp, 10583)
fmt.Println("\n删除 10583 后，哈希表为\nKey -> Value") fmt.Println("\n删除 10583 后，哈希表为\nKey -> Value")
for key, value := range Map { for key, value := range mapp {
fmt.Printf("%d -> %s\n", key, value) fmt.Printf("%d -> %s\n", key, value)
} }
/* 遍历哈希表 */ /* 遍历哈希表 */
// 遍历键值对 key->value // 遍历键值对 key->value
fmt.Println("\n遍历键值对 Key->Value") fmt.Println("\n遍历键值对 Key->Value")
for key, value := range Map { for key, value := range mapp {
fmt.Println(key, "->", value) fmt.Println(key, "->", value)
} }
// 单独遍历键 key // 单独遍历键 key
fmt.Println("\n单独遍历键 Key") fmt.Println("\n单独遍历键 Key")
for key := range Map { for key := range mapp {
fmt.Println(key) fmt.Println(key)
} }
// 单独遍历值 value // 单独遍历值 value
fmt.Println("\n单独遍历值 Value") fmt.Println("\n单独遍历值 Value")
for _, value := range Map { for _, value := range mapp {
fmt.Println(value) fmt.Println(value)
} }
} }

46
codes/python/chapter_hashing/array_hash_map.py
View file

@ -4,25 +4,25 @@ Created Time: 2022-12-14
Author: msk397 (machangxinq@gmail.com) Author: msk397 (machangxinq@gmail.com)
""" """
# 键值对 int->String """ 键值对 int->String """
class Entry: class Entry:
def __init__(self, key, val): def __init__(self, key, val):
self.key = key self.key = key
self.val = val self.val = val
# 基于数组简易实现的哈希表 """ 基于数组简易实现的哈希表 """
class ArrayHashMap: class ArrayHashMap:
def __init__(self): def __init__(self):
# 初始化一个长度为 100 的桶（数组） # 初始化一个长度为 100 的桶（数组）
self.bucket = [None] * 100 self.bucket = [None] * 100
# 哈希函数 """ 哈希函数 """
def hashFunc(self, key): def hashFunc(self, key):
index = key % 100 index = key % 100
return index return index
# 查询操作 """ 查询操作 """
def get(self, key): def get(self, key):
index = self.hashFunc(key) index = self.hashFunc(key)
pair = self.bucket[index] pair = self.bucket[index]
@ -30,19 +30,19 @@ class ArrayHashMap:
return None return None
return pair.val return pair.val
# 添加操作 """ 添加操作 """
def put(self, key, val): def put(self, key, val):
pair = Entry(key, val) pair = Entry(key, val)
index = self.hashFunc(key) index = self.hashFunc(key)
self.bucket[index] = pair self.bucket[index] = pair
# 删除操作 """ 删除操作 """
def remove(self, key): def remove(self, key):
index = self.hashFunc(key) index = self.hashFunc(key)
# 置为空字符，代表删除 # 置为空字符，代表删除
self.bucket[index] = None self.bucket[index] = None
# 获取所有键值对 """ 获取所有键值对 """
def entrySet(self): def entrySet(self):
result = [] result = []
for pair in self.bucket: for pair in self.bucket:
@ -50,7 +50,7 @@ class ArrayHashMap:
result.append(pair) result.append(pair)
return result return result
# 获取所有键 """ 获取所有键 """
def keySet(self): def keySet(self):
result = [] result = []
for pair in self.bucket: for pair in self.bucket:
@ -58,7 +58,7 @@ class ArrayHashMap:
result.append(pair.key) result.append(pair.key)
return result return result
# 获取所有值 """ 获取所有值 """
def valueSet(self): def valueSet(self):
result = [] result = []
for pair in self.bucket: for pair in self.bucket:
@ -66,7 +66,7 @@ class ArrayHashMap:
result.append(pair.val) result.append(pair.val)
return result return result
# 打印哈希表 """ 打印哈希表 """
def print(self): def print(self):
for pair in self.bucket: for pair in self.bucket:
if pair is not None: if pair is not None:
@ -75,38 +75,38 @@ class ArrayHashMap:
if __name__ == "__main__": if __name__ == "__main__":
""" 初始化哈希表 """ """ 初始化哈希表 """
Map = ArrayHashMap() mapp = ArrayHashMap()
""" 添加操作 """ """ 添加操作 """
# 在哈希表中添加键值对 (key, value) # 在哈希表中添加键值对 (key, value)
Map.put(12836, "小哈") mapp.put(12836, "小哈")
Map.put(15937, "小啰") mapp.put(15937, "小啰")
Map.put(16750, "小算") mapp.put(16750, "小算")
Map.put(13276, "小法") mapp.put(13276, "小法")
Map.put(10583, "小鸭") mapp.put(10583, "小鸭")
print("\n添加完成后，哈希表为\nKey -> Value") print("\n添加完成后，哈希表为\nKey -> Value")
Map.print() mapp.print()
""" 查询操作 """ """ 查询操作 """
# 向哈希表输入键 key ，得到值 value # 向哈希表输入键 key ，得到值 value
name = Map.get(15937) name = mapp.get(15937)
print("\n输入学号 15937 ，查询到姓名 " + name) print("\n输入学号 15937 ，查询到姓名 " + name)
""" 删除操作 """ """ 删除操作 """
# 在哈希表中删除键值对 (key, value) # 在哈希表中删除键值对 (key, value)
Map.remove(10583) mapp.remove(10583)
print("\n删除 10583 后，哈希表为\nKey -> Value") print("\n删除 10583 后，哈希表为\nKey -> Value")
Map.print() mapp.print()
""" 遍历哈希表 """ """ 遍历哈希表 """
print("\n遍历键值对 Key->Value") print("\n遍历键值对 Key->Value")
for pair in Map.entrySet(): for pair in mapp.entrySet():
print(pair.key, "->", pair.val) print(pair.key, "->", pair.val)
print("\n单独遍历键 Key") print("\n单独遍历键 Key")
for key in Map.keySet(): for key in mapp.keySet():
print(key) print(key)
print("\n单独遍历值 Value") print("\n单独遍历值 Value")
for val in Map.valueSet(): for val in mapp.valueSet():
print(val) print(val)

33
codes/python/chapter_hashing/hash_map.py
View file

@ -4,43 +4,44 @@ Created Time: 2022-12-14
Author: msk397 (machangxinq@gmail.com) Author: msk397 (machangxinq@gmail.com)
""" """
import sys, os.path as osp
sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__))))
from include import *
if __name__ == "__main__": if __name__ == "__main__":
""" 初始化哈希表 """ """ 初始化哈希表 """
Map = {} mapp = {}
""" 添加操作 """ """ 添加操作 """
# 在哈希表中添加键值对 (key, value) # 在哈希表中添加键值对 (key, value)
Map[12836] = "小哈" mapp[12836] = "小哈"
Map[15937] = "小啰" mapp[15937] = "小啰"
Map[16750] = "小算" mapp[16750] = "小算"
Map[13276] = "小法" mapp[13276] = "小法"
Map[10583] = "小鸭" mapp[10583] = "小鸭"
print("\n添加完成后，哈希表为\nKey -> Value") print("\n添加完成后，哈希表为\nKey -> Value")
for key, value in Map.items(): print_dict(mapp)
print(key, "->", value)
""" 查询操作 """ """ 查询操作 """
# 向哈希表输入键 key ，得到值 value # 向哈希表输入键 key ，得到值 value
name = Map[15937] name = mapp[15937]
print("\n输入学号 15937 ，查询到姓名 " + name) print("\n输入学号 15937 ，查询到姓名 " + name)
""" 删除操作 """ """ 删除操作 """
# 在哈希表中删除键值对 (key, value) # 在哈希表中删除键值对 (key, value)
Map.pop(10583) mapp.pop(10583)
print("\n删除 10583 后，哈希表为\nKey -> Value") print("\n删除 10583 后，哈希表为\nKey -> Value")
for key, value in Map.items(): print_dict(mapp)
print(key, "->", value)
""" 遍历哈希表 """ """ 遍历哈希表 """
print("\n遍历键值对 Key->Value") print("\n遍历键值对 Key->Value")
for key, value in Map.items(): for key, value in mapp.items():
print(key, "->", value) print(key, "->", value)
print("\n单独遍历键 Key") print("\n单独遍历键 Key")
for key in Map.keys(): for key in mapp.keys():
print(key) print(key)
print("\n单独遍历值 Value") print("\n单独遍历值 Value")
for val in Map.values(): for val in mapp.values():
print(val) print(val)

2
codes/python/include/__init__.py
View file

@ -7,4 +7,4 @@ import collections
from typing import List from typing import List
from .linked_list import ListNode, list_to_linked_list, linked_list_to_list, get_list_node from .linked_list import ListNode, list_to_linked_list, linked_list_to_list, get_list_node
from .binary_tree import TreeNode, list_to_tree, tree_to_list, get_tree_node from .binary_tree import TreeNode, list_to_tree, tree_to_list, get_tree_node
from .print_util import print_matrix, print_linked_list, print_tree from .print_util import print_matrix, print_linked_list, print_tree, print_dict

11
codes/python/include/print_util.py
View file

@ -1,7 +1,7 @@
''' '''
File: print_util.py File: print_util.py
Created Time: 2021-12-11 Created Time: 2021-12-11
Author: Krahets (krahets@163.com) Author: Krahets (krahets@163.com), msk397 (machangxinq@gmail.com)
''' '''
import copy import copy
@ -72,3 +72,12 @@ def print_tree(root, prev=None, isLeft=False):
prev.str = prev_str prev.str = prev_str
trunk.str = ' |' trunk.str = ' |'
print_tree(root.left, trunk, False) print_tree(root.left, trunk, False)
def print_dict(d):
"""Print a dict
Args:
d ([type]): [description]
"""
for key, value in d.items():
print(key, '->', value)

114
docs/chapter_hashing/hash_map.md
View file

@ -86,47 +86,47 @@ comments: true
=== "Python" === "Python"
```python title="hash_map.py" ```python title="hash_map.py"
# 初始化哈希表 """ 初始化哈希表 """
Map = {} mapp = {}
# 添加操作 """ 添加操作 """
# 在哈希表中添加键值对 (key, value) # 在哈希表中添加键值对 (key, value)
Map[12836] = "小哈" mapp[12836] = "小哈"
Map[15937] = "小啰" mapp[15937] = "小啰"
Map[16750] = "小算" mapp[16750] = "小算"
Map[13276] = "小法" mapp[13276] = "小法"
Map[10583] = "小鸭" mapp[10583] = "小鸭"
# 查询操作 """ 查询操作 """
# 向哈希表输入键 key ，得到值 value # 向哈希表输入键 key ，得到值 value
name = Map[15937] name = mapp[15937]
# 删除操作 """ 删除操作 """
# 在哈希表中删除键值对 (key, value) # 在哈希表中删除键值对 (key, value)
Map.pop(10583) mapp.pop(10583)
``` ```
=== "Go" === "Go"
```go title="hash_map_test.go" ```go title="hash_map_test.go"
// 初始化哈希表 /* 初始化哈希表 */
Map := make(map[int]string) mapp := make(map[int]string)
// 添加操作 /* 添加操作 */
// 在哈希表中添加键值对 (key, value) // 在哈希表中添加键值对 (key, value)
Map[12836] = "小哈" mapp[12836] = "小哈"
Map[15937] = "小啰" mapp[15937] = "小啰"
Map[16750] = "小算" mapp[16750] = "小算"
Map[13276] = "小法" mapp[13276] = "小法"
Map[10583] = "小鸭" mapp[10583] = "小鸭"
// 查询操作 /* 查询操作 */
// 向哈希表输入键 key ，得到值 value // 向哈希表输入键 key ，得到值 value
name := Map[15937] name := mapp[15937]
// 删除操作 /* 删除操作 */
// 在哈希表中删除键值对 (key, value) // 在哈希表中删除键值对 (key, value)
delete(Map, 10583) delete(mapp, 10583)
``` ```
=== "JavaScript" === "JavaScript"
@ -196,13 +196,13 @@ comments: true
```python title="hash_map.py" ```python title="hash_map.py"
""" 遍历哈希表 """ """ 遍历哈希表 """
# 遍历键值对 key->value # 遍历键值对 key->value
for key, value in Map.items(): for key, value in mapp.items():
print(key, "->", value) print(key, "->", value)
# 单独遍历键 key # 单独遍历键 key
for key in Map.keys(): for key in mapp.keys():
print(key) print(key)
# 单独遍历值 value # 单独遍历值 value
for value in Map.values(): for value in mapp.values():
print(value) print(value)
``` ```
@ -211,15 +211,15 @@ comments: true
```go title="hash_map_test.go" ```go title="hash_map_test.go"
/* 遍历哈希表 */ /* 遍历哈希表 */
// 遍历键值对 key->value // 遍历键值对 key->value
for key, value := range Map { for key, value := range mapp {
fmt.Println(key, "->", value) fmt.Println(key, "->", value)
} }
// 单独遍历键 key // 单独遍历键 key
for key := range Map { for key := range mapp {
fmt.Println(key) fmt.Println(key)
} }
// 单独遍历值 value // 单独遍历值 value
for _, value := range Map { for _, value := range mapp {
fmt.Println(value) fmt.Println(value)
} }
``` ```
@ -335,20 +335,16 @@ $$
this->key = key; this->key = key;
this->val = val; this->val = val;
} }
Entry(){
this->key = -1;
this->val = "";
}
}; };
/* 基于数组简易实现的哈希表 */ /* 基于数组简易实现的哈希表 */
class ArrayHashMap { class ArrayHashMap {
private: private:
vector<Entry> bucket; vector<Entry*> bucket;
public: public:
ArrayHashMap() { ArrayHashMap() {
// 初始化一个长度为 100 的桶（数组） // 初始化一个长度为 100 的桶（数组）
bucket= vector<Entry>(100); bucket= vector<Entry*>(100);
} }
/* 哈希函数 */ /* 哈希函数 */
@ -360,13 +356,13 @@ $$
/* 查询操作 */ /* 查询操作 */
string get(int key) { string get(int key) {
int index = hashFunc(key); int index = hashFunc(key);
Entry pair = bucket[index]; Entry* pair = bucket[index];
return pair.val; return pair->val;
} }
/* 添加操作 */ /* 添加操作 */
void put(int key, string val) { void put(int key, string val) {
Entry pair = Entry(key, val); Entry* pair = new Entry(key, val);
int index = hashFunc(key); int index = hashFunc(key);
bucket[index] = pair; bucket[index] = pair;
} }
@ -374,8 +370,8 @@ $$
/* 删除操作 */ /* 删除操作 */
void remove(int key) { void remove(int key) {
int index = hashFunc(key); int index = hashFunc(key);
// 置为空，代表删除 // 置为空字符，代表删除
bucket[index] = *new Entry(); bucket[index] = nullptr;
} }
}; };
``` ```
@ -383,24 +379,24 @@ $$
=== "Python" === "Python"
```python title="array_hash_map.py" ```python title="array_hash_map.py"
# 键值对 int->String """ 键值对 int->String """
class Entry: class Entry:
def __init__(self, key, val): def __init__(self, key, val):
self.key = key self.key = key
self.val = val self.val = val
# 基于数组简易实现的哈希表 """ 基于数组简易实现的哈希表 """
class ArrayHashMap: class ArrayHashMap:
def __init__(self): def __init__(self):
# 初始化一个长度为 100 的桶（数组） # 初始化一个长度为 100 的桶（数组）
self.bucket = [None] * 100 self.bucket = [None] * 100
# 哈希函数 """ 哈希函数 """
def hashFunc(self, key): def hashFunc(self, key):
index = key % 100 index = key % 100
return index return index
# 查询操作 """ 查询操作 """
def get(self, key): def get(self, key):
index = self.hashFunc(key) index = self.hashFunc(key)
pair = self.bucket[index] pair = self.bucket[index]
@ -408,13 +404,13 @@ $$
return None return None
return pair.val return pair.val
# 添加操作 """ 添加操作 """
def put(self, key, val): def put(self, key, val):
pair = Entry(key, val) pair = Entry(key, val)
index = self.hashFunc(key) index = self.hashFunc(key)
self.bucket[index] = pair self.bucket[index] = pair
# 删除操作 """ 删除操作 """
def remove(self, key): def remove(self, key):
index = self.hashFunc(key) index = self.hashFunc(key)
# 置为空字符，代表删除 # 置为空字符，代表删除
@ -424,51 +420,51 @@ $$
=== "Go" === "Go"
```go title="array_hash_map.go" ```go title="array_hash_map.go"
// 键值对 int->String /* 键值对 int->String */
type Entry struct { type Entry struct {
key int key int
val string val string
} }
// 基于数组简易实现的哈希表 /* 基于数组简易实现的哈希表 */
type ArrayHashMap struct { type ArrayHashMap struct {
bucket []Entry bucket []*Entry
} }
func newArrayHashMap() *ArrayHashMap { func newArrayHashMap() *ArrayHashMap {
// 初始化一个长度为 100 的桶（数组） // 初始化一个长度为 100 的桶（数组）
bucket := make([]Entry, 100) bucket := make([]*Entry, 100)
return &ArrayHashMap{bucket: bucket} return &ArrayHashMap{bucket: bucket}
} }
// 哈希函数 /* 哈希函数 */
func (a *ArrayHashMap) hashFunc(key int) int { func (a *ArrayHashMap) hashFunc(key int) int {
index := key % 100 index := key % 100
return index return index
} }
// 查询操作 /* 查询操作 */
func (a *ArrayHashMap) get(key int) string { func (a *ArrayHashMap) get(key int) string {
index := a.hashFunc(key) index := a.hashFunc(key)
pair := a.bucket[index] pair := a.bucket[index]
if pair.key == 0 { if pair == nil {
return "" return "Not Found"
} }
return pair.val return pair.val
} }
// 添加操作 /* 添加操作 */
func (a *ArrayHashMap) put(key int, val string) { func (a *ArrayHashMap) put(key int, val string) {
pair := Entry{key: key, val: val} pair := &Entry{key: key, val: val}
index := a.hashFunc(key) index := a.hashFunc(key)
a.bucket[index] = pair a.bucket[index] = pair
} }
// 删除操作 /* 删除操作 */
func (a *ArrayHashMap) remove(key int) { func (a *ArrayHashMap) remove(key int) {
index := a.hashFunc(key) index := a.hashFunc(key)
// 置为空字符，代表删除 // 置为空字符，代表删除
a.bucket[index] = Entry{} a.bucket[index] = nil
} }
``` ```