From ebf902413684e8a18205a11252c824872ae38b46 Mon Sep 17 00:00:00 2001
From: Yudong Jin <krahets@163.com>
Date: Sat, 3 Dec 2022 20:25:24 +0800
Subject: [PATCH] Add Go codes to docs, including the chapter of stack and
 queue, the chapter of tree.

---
 codes/cpp/chapter_stack_and_queue/deque.cpp   |   2 +-
 .../leetcode_two_sum_test.go                  |   5 +-
 .../chapter_searching/linear_search_test.go   |   5 +-
 .../go/chapter_stack_and_queue/array_queue.go |  59 +++-----
 .../go/chapter_stack_and_queue/array_stack.go |  27 +---
 codes/go/chapter_stack_and_queue/deque.go     |  26 ----
 .../go/chapter_stack_and_queue/deque_test.go  |  69 ++++++++--
 .../linkedlist_deque.go                       |  60 +++------
 .../linkedlist_queue.go                       |  43 ++----
 .../linkedlist_stack.go                       |  43 ++----
 codes/go/chapter_stack_and_queue/queue.go     |  20 ---
 .../go/chapter_stack_and_queue/queue_test.go  |  83 +++++++++---
 codes/go/chapter_stack_and_queue/stack.go     |  20 ---
 .../go/chapter_stack_and_queue/stack_test.go  |  78 ++++++++---
 codes/go/chapter_tree/binary_search_tree.go   |  13 +-
 .../chapter_tree/binary_search_tree_test.go   |  21 +--
 codes/go/chapter_tree/binary_tree.go          |  23 ----
 codes/go/chapter_tree/binary_tree_bfs.go      |   5 +-
 codes/go/chapter_tree/binary_tree_bfs_test.go |   5 +-
 codes/go/chapter_tree/binary_tree_dfs.go      |  71 ++++------
 codes/go/chapter_tree/binary_tree_dfs_test.go |  18 ++-
 codes/go/chapter_tree/binary_tree_test.go     |  18 +--
 codes/go/pkg/list_node.go                     |  20 ---
 codes/go/pkg/list_node_test.go                |   7 +-
 codes/go/pkg/print_utils.go                   |  98 ++++++++++++++
 codes/go/pkg/tree_node.go                     |  56 --------
 codes/go/pkg/tree_node_test.go                |   7 +-
 codes/java/chapter_stack_and_queue/deque.java |   2 +-
 .../chapter_array_and_linkedlist/array.js     |   2 +-
 .../chapter_sorting/insertion_sort.js         |   2 +-
 .../chapter_array_and_linkedlist/list.py      |   2 +-
 .../python/chapter_sorting/insertion_sort.py  |   2 +-
 codes/python/chapter_stack_and_queue/deque.py |   2 +-
 docs/chapter_array_and_linkedlist/array.md    |   2 +-
 .../space_complexity.md                       |   2 +-
 .../time_complexity.md                        |   2 +-
 docs/chapter_stack_and_queue/deque.md         |  29 +++-
 docs/chapter_stack_and_queue/queue.md         | 126 ++++++++++++++++++
 docs/chapter_stack_and_queue/stack.md         | 113 ++++++++++++++++
 docs/chapter_tree/binary_search_tree.md       | 106 ++++++++++++++-
 docs/chapter_tree/binary_tree.md              |  90 ++++++++++++-
 41 files changed, 898 insertions(+), 486 deletions(-)
 delete mode 100644 codes/go/chapter_stack_and_queue/deque.go
 delete mode 100644 codes/go/chapter_stack_and_queue/queue.go
 delete mode 100644 codes/go/chapter_stack_and_queue/stack.go
 delete mode 100644 codes/go/chapter_tree/binary_tree.go
 create mode 100644 codes/go/pkg/print_utils.go

diff --git a/codes/cpp/chapter_stack_and_queue/deque.cpp b/codes/cpp/chapter_stack_and_queue/deque.cpp
index 820dd4a..96cf581 100644
--- a/codes/cpp/chapter_stack_and_queue/deque.cpp
+++ b/codes/cpp/chapter_stack_and_queue/deque.cpp
@@ -21,7 +21,7 @@ int main() {
     cout << "双向队列 deque = ";
     PrintUtil::printDeque(deque);
 
-    /* 访问队首元素 */
+    /* 访问元素 */
     int front = deque.front();
     cout << "队首元素 front = " << front << endl;
     int back = deque.back();
diff --git a/codes/go/chapter_computational_complexity/leetcode_two_sum_test.go b/codes/go/chapter_computational_complexity/leetcode_two_sum_test.go
index b787c65..6e44eef 100644
--- a/codes/go/chapter_computational_complexity/leetcode_two_sum_test.go
+++ b/codes/go/chapter_computational_complexity/leetcode_two_sum_test.go
@@ -5,6 +5,7 @@
 package chapter_computational_complexity
 
 import (
+	"fmt"
 	"testing"
 )
 
@@ -16,8 +17,8 @@ func TestTwoSum(t *testing.T) {
 	// ====== Driver Code ======
 	// 方法一：暴力解法
 	res := twoSumBruteForce(nums, target)
-	t.Log("方法一 res =", res)
+	fmt.Println("方法一 res =", res)
 	// 方法二：哈希表
 	res = twoSumHashTable(nums, target)
-	t.Log("方法二 res =", res)
+	fmt.Println("方法二 res =", res)
 }
diff --git a/codes/go/chapter_searching/linear_search_test.go b/codes/go/chapter_searching/linear_search_test.go
index c240644..79525aa 100644
--- a/codes/go/chapter_searching/linear_search_test.go
+++ b/codes/go/chapter_searching/linear_search_test.go
@@ -5,6 +5,7 @@
 package chapter_searching
 
 import (
+	"fmt"
 	"testing"
 
 	. "github.com/krahets/hello-algo/pkg"
@@ -16,10 +17,10 @@ func TestLinearSearch(t *testing.T) {
 
 	// 在数组中执行线性查找
 	index := linerSearchArray(nums, target)
-	t.Log("目标元素 3 的索引 =", index)
+	fmt.Println("目标元素 3 的索引 =", index)
 
 	// 在链表中执行线性查找
 	head := ArrayToLinkedList(nums)
 	node := linerSearchLinkedList(head, target)
-	t.Log("目标结点值 3 的对应结点对象为", node)
+	fmt.Println("目标结点值 3 的对应结点对象为", node)
 }
diff --git a/codes/go/chapter_stack_and_queue/array_queue.go b/codes/go/chapter_stack_and_queue/array_queue.go
index fd41f8b..863768b 100644
--- a/codes/go/chapter_stack_and_queue/array_queue.go
+++ b/codes/go/chapter_stack_and_queue/array_queue.go
@@ -4,50 +4,45 @@
 
 package chapter_stack_and_queue
 
-import (
-	"fmt"
-	"strings"
-)
-
-// ArrayQueue 基于环形数组实现的队列, 不支持扩容
+/* 基于环形数组实现的队列 */
 type ArrayQueue struct {
-	data     []any // 用于存储队列元素的数组
+	data     []int // 用于存储队列元素的数组
 	capacity int   // 队列容量（即最多容量的元素个数）
-	head     int   // 头指针，指向队首
-	tail     int   // 尾指针，指向队尾 + 1
+	front    int   // 头指针，指向队首
+	rear     int   // 尾指针，指向队尾 + 1
 }
 
 // NewArrayQueue 基于环形数组实现的队列
 func NewArrayQueue(capacity int) *ArrayQueue {
 	return &ArrayQueue{
-		data:     make([]any, capacity),
+		data:     make([]int, capacity),
 		capacity: capacity,
-		head:     0,
-		tail:     0,
+		front:    0,
+		rear:     0,
 	}
 }
 
 // Size 获取队列的长度
 func (q *ArrayQueue) Size() int {
-	size := (q.capacity + q.tail - q.head) % q.capacity
+	size := (q.capacity + q.rear - q.front) % q.capacity
 	return size
 }
 
 // IsEmpty 判断队列是否为空
 func (q *ArrayQueue) IsEmpty() bool {
-	return q.tail-q.head == 0
+	return q.rear-q.front == 0
 }
 
 // Offer 入队
-func (q *ArrayQueue) Offer(v any) {
-	// 当 tail == capacity 表示队列已满
+func (q *ArrayQueue) Offer(v int) {
+	// 当 rear == capacity 表示队列已满
 	if q.Size() == q.capacity {
 		return
 	}
 	// 尾结点后添加
-	q.data[q.tail] = v
+	q.data[q.rear] = v
 	// 尾指针向后移动一位，越过尾部后返回到数组头部
-	q.tail = (q.tail + 1) % q.capacity
+	q.rear = (q.rear + 1) % q.capacity
 }
 
 // Poll 出队
@@ -55,9 +50,9 @@ func (q *ArrayQueue) Poll() any {
 	if q.IsEmpty() {
 		return nil
 	}
-	v := q.data[q.head]
+	v := q.data[q.front]
 	// 队头指针向后移动一位，若越过尾部则返回到数组头部
-	q.head = (q.head + 1) % q.capacity
+	q.front = (q.front + 1) % q.capacity
 	return v
 }
 
@@ -66,27 +61,11 @@ func (q *ArrayQueue) Peek() any {
 	if q.IsEmpty() {
 		return nil
 	}
-	v := q.data[q.head]
+	v := q.data[q.front]
 	return v
 }
 
-func (q *ArrayQueue) Print() {
-	fmt.Println(q.toString())
-}
-
-// toString 通过字符串的方式输出
-func (q *ArrayQueue) toString() string {
-	// 为空时
-	if q.IsEmpty() {
-		return "empty items"
-	}
-	var builder strings.Builder
-	size := q.Size()
-	str := fmt.Sprintf("%+v", q.data[q.head])
-	for i := 1; i < size; i++ {
-		builder.WriteString(str + " -> ")
-		str = fmt.Sprintf("%+v", q.data[(i+q.head)%q.capacity])
-	}
-	builder.WriteString(str)
-	return builder.String()
+// 获取 Slice 用于打印
+func (s *ArrayQueue) toSlice() []int {
+	return s.data[s.front:s.rear]
 }
diff --git a/codes/go/chapter_stack_and_queue/array_stack.go b/codes/go/chapter_stack_and_queue/array_stack.go
index f3a8a28..dca9740 100644
--- a/codes/go/chapter_stack_and_queue/array_stack.go
+++ b/codes/go/chapter_stack_and_queue/array_stack.go
@@ -4,13 +4,7 @@
 
 package chapter_stack_and_queue
 
-import (
-	"fmt"
-	"strconv"
-	"strings"
-)
-
-// ArrayStack 基于数组实现的栈
+/* 基于数组实现的栈 */
 type ArrayStack struct {
 	data []int // 数据
 }
@@ -38,6 +32,7 @@ func (s *ArrayStack) Push(v int) {
 	s.data = append(s.data, v)
 }
 
+// Pop 出栈
 func (s *ArrayStack) Pop() any {
 	// 弹出栈前，先判断是否为空
 	if s.IsEmpty() {
@@ -48,6 +43,7 @@ func (s *ArrayStack) Pop() any {
 	return val
 }
 
+// Peek 获取栈顶元素
 func (s *ArrayStack) Peek() any {
 	if s.IsEmpty() {
 		return nil
@@ -56,18 +52,7 @@ func (s *ArrayStack) Peek() any {
 	return val
 }
 
-func (s *ArrayStack) Print() {
-	fmt.Println(s.toString())
-}
-
-func (s *ArrayStack) toString() string {
-	var builder strings.Builder
-	if s.IsEmpty() {
-		return "empty stack"
-	}
-	for i := len(s.data) - 1; i > 0; i-- {
-		builder.WriteString(strconv.Itoa(s.data[i]) + " -> ")
-	}
-	builder.WriteString(strconv.Itoa(s.data[0]))
-	return builder.String()
+// 获取 Slice 用于打印
+func (s *ArrayStack) toSlice() []int {
+	return s.data
 }
diff --git a/codes/go/chapter_stack_and_queue/deque.go b/codes/go/chapter_stack_and_queue/deque.go
deleted file mode 100644
index 3ac070e..0000000
--- a/codes/go/chapter_stack_and_queue/deque.go
+++ /dev/null
@@ -1,26 +0,0 @@
-// File: deque.go
-// Created Time: 2022-11-29
-// Author: Reanon (793584285@qq.com)
-
-package chapter_stack_and_queue
-
-type Deque interface {
-	// OfferFirst 元素入队
-	OfferFirst(num any)
-	// OfferLast 元素入队
-	OfferLast(num any)
-	// PeekFirst 访问首元素
-	PeekFirst() any
-	// PeekLast 访问尾元素
-	PeekLast() any
-	// PollFirst 元素出队
-	PollFirst() any
-	// PollLast 元素出队
-	PollLast() any
-	// Size 获取队列长度
-	Size() int
-	// IsEmpty 队列是否为空
-	IsEmpty() bool
-	// toString 队列输出为字符串
-	toString() string
-}
diff --git a/codes/go/chapter_stack_and_queue/deque_test.go b/codes/go/chapter_stack_and_queue/deque_test.go
index c0eaf08..647ac64 100644
--- a/codes/go/chapter_stack_and_queue/deque_test.go
+++ b/codes/go/chapter_stack_and_queue/deque_test.go
@@ -4,12 +4,54 @@
 
 package chapter_stack_and_queue
 
-import "testing"
+import (
+	"container/list"
+	"fmt"
+	"testing"
+
+	. "github.com/krahets/hello-algo/pkg"
+)
+
+func TestDeque(t *testing.T) {
+	/* 初始化双向队列 */
+	// 在 Go 中，将 list 作为双向队列使用
+	deque := list.New()
+
+	/* 元素入队 */
+	deque.PushBack(2)
+	deque.PushBack(5)
+	deque.PushBack(4)
+	deque.PushFront(3)
+	deque.PushFront(1)
+	fmt.Print("双向队列 deque = ")
+	PrintList(deque)
+
+	/* 访问元素 */
+	front := deque.Front()
+	fmt.Println("队首元素 front =", front.Value)
+	rear := deque.Back()
+	fmt.Println("队尾元素 rear =", rear.Value)
+
+	/* 元素出队 */
+	deque.Remove(front)
+	fmt.Print("队首出队元素 front = ", front.Value, "，队首出队后 deque = ")
+	PrintList(deque)
+	deque.Remove(rear)
+	fmt.Print("队尾出队元素 rear = ", rear.Value, "，队尾出队后 deque = ")
+	PrintList(deque)
+
+	/* 获取双向队列的长度 */
+	size := deque.Len()
+	fmt.Println("双向队列长度 size =", size)
+
+	/* 判断双向队列是否为空 */
+	isEmpty := deque.Len() == 0
+	fmt.Println("双向队列是否为空 =", isEmpty)
+}
 
 func TestLinkedListDeque(t *testing.T) {
 	// 初始化队列
-	var deque Deque
-	deque = NewLinkedListDeque()
+	deque := NewLinkedListDeque()
 
 	// 元素入队
 	deque.OfferLast(2)
@@ -17,27 +59,30 @@ func TestLinkedListDeque(t *testing.T) {
 	deque.OfferLast(4)
 	deque.OfferFirst(3)
 	deque.OfferFirst(1)
-	t.Log("队列 deque = ", deque.toString())
+	fmt.Print("队列 deque = ")
+	PrintList(deque.toList())
 
 	// 访问队首元素
-	peekFirst := deque.PeekFirst()
-	t.Log("队首元素 peek = ", peekFirst)
-	peekLast := deque.PeekLast()
-	t.Log("队尾元素 peek = ", peekLast)
+	front := deque.PeekFirst()
+	fmt.Println("队首元素 front =", front)
+	rear := deque.PeekLast()
+	fmt.Println("队尾元素 rear =", rear)
 
 	// 元素出队
 	pollFirst := deque.PollFirst()
-	t.Log("队首出队元素 pollFirst = ", pollFirst, "，队首出队后 deque = ", deque.toString())
+	fmt.Print("队首出队元素 pollFirst = ", pollFirst, "，队首出队后 deque = ")
+	PrintList(deque.toList())
 	pollLast := deque.PollLast()
-	t.Log("队尾出队元素 pollLast  = ", pollLast, "，队尾出队后 deque = ", deque.toString())
+	fmt.Print("队尾出队元素 pollLast = ", pollLast, "，队尾出队后 deque = ")
+	PrintList(deque.toList())
 
 	// 获取队的长度
 	size := deque.Size()
-	t.Log("队的长度 size = ", size)
+	fmt.Println("队的长度 size =", size)
 
 	// 判断是否为空
 	isEmpty := deque.IsEmpty()
-	t.Log("队是否为空 = ", isEmpty)
+	fmt.Println("队是否为空 =", isEmpty)
 }
 
 // BenchmarkArrayQueue 67.92 ns/op in Mac M1 Pro
diff --git a/codes/go/chapter_stack_and_queue/linkedlist_deque.go b/codes/go/chapter_stack_and_queue/linkedlist_deque.go
index 62a6149..019aa77 100644
--- a/codes/go/chapter_stack_and_queue/linkedlist_deque.go
+++ b/codes/go/chapter_stack_and_queue/linkedlist_deque.go
@@ -6,97 +6,79 @@ package chapter_stack_and_queue
 
 import (
 	"container/list"
-	"fmt"
-	"strings"
 )
 
 // LinkedListDeque 基于链表实现的双端队列, 使用内置包 list 来实现栈
 type LinkedListDeque struct {
-	list *list.List
+	data *list.List
 }
 
 // NewLinkedListDeque 初始化双端队列
 func NewLinkedListDeque() *LinkedListDeque {
 	return &LinkedListDeque{
-		list: list.New(),
+		data: list.New(),
 	}
 }
 
-// OfferFirst 元素入队
+// OfferFirst 队首元素入队
 func (s *LinkedListDeque) OfferFirst(value any) {
-	s.list.PushFront(value)
+	s.data.PushFront(value)
 }
 
-// OfferLast 元素入队
+// OfferLast 队尾元素入队
 func (s *LinkedListDeque) OfferLast(value any) {
-	s.list.PushBack(value)
+	s.data.PushBack(value)
 }
 
-// PollFirst 元素出队
+// PollFirst 队首元素出队
 func (s *LinkedListDeque) PollFirst() any {
 	if s.IsEmpty() {
 		return nil
 	}
-	e := s.list.Front()
-	s.list.Remove(e)
+	e := s.data.Front()
+	s.data.Remove(e)
 	return e.Value
 }
 
-// PollLast 元素出队
+// PollLast 队尾元素出队
 func (s *LinkedListDeque) PollLast() any {
 	if s.IsEmpty() {
 		return nil
 	}
-	e := s.list.Back()
-	s.list.Remove(e)
+	e := s.data.Back()
+	s.data.Remove(e)
 	return e.Value
 }
 
-// PeekFirst 访问首元素
+// PeekFirst 访问队首元素
 func (s *LinkedListDeque) PeekFirst() any {
 	if s.IsEmpty() {
 		return nil
 	}
-	e := s.list.Front()
+	e := s.data.Front()
 	return e.Value
 }
 
-// PeekLast 访问尾元素
+// PeekLast 访问队尾元素
 func (s *LinkedListDeque) PeekLast() any {
 	if s.IsEmpty() {
 		return nil
 	}
-	e := s.list.Back()
+	e := s.data.Back()
 	return e.Value
 }
 
 // Size 获取队列的长度
 func (s *LinkedListDeque) Size() int {
-	return s.list.Len()
+	return s.data.Len()
 }
 
 // IsEmpty 判断队列是否为空
 func (s *LinkedListDeque) IsEmpty() bool {
-	return s.list.Len() == 0
+	return s.data.Len() == 0
 }
 
-func (s *LinkedListDeque) Print() {
-	fmt.Println(s.toString())
-}
-
-func (s *LinkedListDeque) toString() string {
-	var builder strings.Builder
-	if s.IsEmpty() {
-		fmt.Println("empty stack")
-	}
-	e := s.list.Front()
-	// 强转为 string, 会影响效率
-	str := fmt.Sprintf("%v", e.Value)
-	for e.Next() != nil {
-		builder.WriteString(str + " -> ")
-		e = e.Next()
-		str = fmt.Sprintf("%v", e.Value)
-	}
-	builder.WriteString(str)
-	return builder.String()
+// 获取 List 用于打印
+func (s *LinkedListDeque) toList() *list.List {
+	return s.data
 }
diff --git a/codes/go/chapter_stack_and_queue/linkedlist_queue.go b/codes/go/chapter_stack_and_queue/linkedlist_queue.go
index 5b62ac3..d304618 100644
--- a/codes/go/chapter_stack_and_queue/linkedlist_queue.go
+++ b/codes/go/chapter_stack_and_queue/linkedlist_queue.go
@@ -6,25 +6,24 @@ package chapter_stack_and_queue
 
 import (
 	"container/list"
-	"fmt"
-	"strings"
 )
 
-// LinkedListQueue 基于链表实现的队列, 使用内置包 list 来实现栈
+/* 基于链表实现的队列 */
 type LinkedListQueue struct {
-	list *list.List
+	// 使用内置包 list 来实现队列
+	data *list.List
 }
 
 // NewLinkedListQueue 初始化链表
 func NewLinkedListQueue() *LinkedListQueue {
 	return &LinkedListQueue{
-		list: list.New(),
+		data: list.New(),
 	}
 }
 
 // Offer 入队
 func (s *LinkedListQueue) Offer(value any) {
-	s.list.PushBack(value)
+	s.data.PushBack(value)
 }
 
 // Poll 出队
@@ -32,8 +31,8 @@ func (s *LinkedListQueue) Poll() any {
 	if s.IsEmpty() {
 		return nil
 	}
-	e := s.list.Front()
-	s.list.Remove(e)
+	e := s.data.Front()
+	s.data.Remove(e)
 	return e.Value
 }
 
@@ -42,37 +41,21 @@ func (s *LinkedListQueue) Peek() any {
 	if s.IsEmpty() {
 		return nil
 	}
-	e := s.list.Front()
+	e := s.data.Front()
 	return e.Value
 }
 
 // Size 获取队列的长度
 func (s *LinkedListQueue) Size() int {
-	return s.list.Len()
+	return s.data.Len()
 }
 
 // IsEmpty 判断队列是否为空
 func (s *LinkedListQueue) IsEmpty() bool {
-	return s.list.Len() == 0
+	return s.data.Len() == 0
 }
 
-func (s *LinkedListQueue) Print() {
-	fmt.Println(s.toString())
-}
-
-func (s *LinkedListQueue) toString() string {
-	var builder strings.Builder
-	if s.IsEmpty() {
-		fmt.Println("empty stack")
-	}
-	e := s.list.Front()
-	// 强转为 string, 会影响效率
-	str := fmt.Sprintf("%v", e.Value)
-	for e.Next() != nil {
-		builder.WriteString(str + " -> ")
-		e = e.Next()
-		str = fmt.Sprintf("%v", e.Value)
-	}
-	builder.WriteString(str)
-	return builder.String()
+// 获取 List 用于打印
+func (s *LinkedListQueue) toList() *list.List {
+	return s.data
 }
diff --git a/codes/go/chapter_stack_and_queue/linkedlist_stack.go b/codes/go/chapter_stack_and_queue/linkedlist_stack.go
index 24f46ac..ab8a062 100644
--- a/codes/go/chapter_stack_and_queue/linkedlist_stack.go
+++ b/codes/go/chapter_stack_and_queue/linkedlist_stack.go
@@ -6,25 +6,24 @@ package chapter_stack_and_queue
 
 import (
 	"container/list"
-	"fmt"
-	"strings"
 )
 
-// LinkedListStack 基于链表实现的栈, 使用内置包 list 来实现栈
+/* 基于链表实现的栈 */
 type LinkedListStack struct {
-	list *list.List
+	// 使用内置包 list 来实现栈
+	data *list.List
 }
 
 // NewLinkedListStack 初始化链表
 func NewLinkedListStack() *LinkedListStack {
 	return &LinkedListStack{
-		list: list.New(),
+		data: list.New(),
 	}
 }
 
 // Push 入栈
 func (s *LinkedListStack) Push(value int) {
-	s.list.PushBack(value)
+	s.data.PushBack(value)
 }
 
 // Pop 出栈
@@ -32,8 +31,8 @@ func (s *LinkedListStack) Pop() any {
 	if s.IsEmpty() {
 		return nil
 	}
-	e := s.list.Back()
-	s.list.Remove(e)
+	e := s.data.Back()
+	s.data.Remove(e)
 	return e.Value
 }
 
@@ -42,37 +41,21 @@ func (s *LinkedListStack) Peek() any {
 	if s.IsEmpty() {
 		return nil
 	}
-	e := s.list.Back()
+	e := s.data.Back()
 	return e.Value
 }
 
 // Size 获取栈的长度
 func (s *LinkedListStack) Size() int {
-	return s.list.Len()
+	return s.data.Len()
 }
 
 // IsEmpty 判断栈是否为空
 func (s *LinkedListStack) IsEmpty() bool {
-	return s.list.Len() == 0
+	return s.data.Len() == 0
 }
 
-func (s *LinkedListStack) Print() {
-	fmt.Println(s.toString())
-}
-
-func (s *LinkedListStack) toString() string {
-	var builder strings.Builder
-	if s.IsEmpty() {
-		fmt.Println("empty stack")
-	}
-	e := s.list.Back()
-	// 强转为 string, 会影响效率
-	str := fmt.Sprintf("%v", e.Value)
-	for e.Prev() != nil {
-		builder.WriteString(str + " -> ")
-		e = e.Prev()
-		str = fmt.Sprintf("%v", e.Value)
-	}
-	builder.WriteString(str)
-	return builder.String()
+// 获取 List 用于打印
+func (s *LinkedListStack) toList() *list.List {
+	return s.data
 }
diff --git a/codes/go/chapter_stack_and_queue/queue.go b/codes/go/chapter_stack_and_queue/queue.go
deleted file mode 100644
index 03b97e5..0000000
--- a/codes/go/chapter_stack_and_queue/queue.go
+++ /dev/null
@@ -1,20 +0,0 @@
-// File: queue.go
-// Created Time: 2022-11-29
-// Author: Reanon (793584285@qq.com)
-
-package chapter_stack_and_queue
-
-type Queue interface {
-	// Offer 元素入队
-	Offer(num any)
-	// Peek 访问首元素
-	Peek() any
-	// Poll 元素出队
-	Poll() any
-	// Size 获取队列长度
-	Size() int
-	// IsEmpty 队列是否为空
-	IsEmpty() bool
-	// toString 队列输出为字符串
-	toString() string
-}
diff --git a/codes/go/chapter_stack_and_queue/queue_test.go b/codes/go/chapter_stack_and_queue/queue_test.go
index e8c74ec..368becb 100644
--- a/codes/go/chapter_stack_and_queue/queue_test.go
+++ b/codes/go/chapter_stack_and_queue/queue_test.go
@@ -4,67 +4,108 @@
 
 package chapter_stack_and_queue
 
-import "testing"
+import (
+	"container/list"
+	"fmt"
+	"testing"
+
+	. "github.com/krahets/hello-algo/pkg"
+)
+
+func TestQueue(t *testing.T) {
+	/* 初始化队列 */
+	// 在 Go 中，将 list 作为队列来使用
+	queue := list.New()
+
+	/* 元素入队 */
+	queue.PushBack(1)
+	queue.PushBack(3)
+	queue.PushBack(2)
+	queue.PushBack(5)
+	queue.PushBack(4)
+	fmt.Print("队列 queue = ")
+	PrintList(queue)
+
+	/* 访问队首元素 */
+	peek := queue.Front()
+	fmt.Println("队首元素 peek =", peek.Value)
+
+	/* 元素出队 */
+	poll := queue.Front()
+	queue.Remove(poll)
+	fmt.Print("出队元素 poll = ", poll.Value, "，出队后 queue = ")
+	PrintList(queue)
+
+	/* 获取队列的长度 */
+	size := queue.Len()
+	fmt.Println("队列长度 size =", size)
+
+	/* 判断队列是否为空 */
+	isEmpty := queue.Len() == 0
+	fmt.Println("队列是否为空 =", isEmpty)
+}
 
 func TestArrayQueue(t *testing.T) {
 	// 初始化队列，使用队列的通用接口
-	var queue Queue
 	capacity := 10
-	queue = NewArrayQueue(capacity)
+	queue := NewArrayQueue(capacity)
 
 	// 元素入队
 	queue.Offer(1)
-	queue.Offer(2)
 	queue.Offer(3)
-	queue.Offer(4)
+	queue.Offer(2)
 	queue.Offer(5)
-	t.Log("队列 queue = ", queue.toString())
+	queue.Offer(4)
+	fmt.Print("队列 queue = ")
+	PrintSlice(queue.toSlice())
 
 	// 访问队首元素
 	peek := queue.Peek()
-	t.Log("队首元素 peek = ", peek)
+	fmt.Println("队首元素 peek =", peek)
 
 	// 元素出队
-	pop := queue.Poll()
-	t.Log("出队元素 pop  = ", pop, ", 出队后 queue =", queue.toString())
+	poll := queue.Poll()
+	fmt.Print("出队元素 poll = ", poll, ", 出队后 queue = ")
+	PrintSlice(queue.toSlice())
 
 	// 获取队的长度
 	size := queue.Size()
-	t.Log("队的长度 size = ", size)
+	fmt.Println("队的长度 size =", size)
 
 	// 判断是否为空
 	isEmpty := queue.IsEmpty()
-	t.Log("队是否为空 = ", isEmpty)
+	fmt.Println("队是否为空 =", isEmpty)
 }
 
 func TestLinkedListQueue(t *testing.T) {
 	// 初始化队
-	var queue Queue
-	queue = NewLinkedListQueue()
+	queue := NewLinkedListQueue()
 
 	// 元素入队
 	queue.Offer(1)
-	queue.Offer(2)
 	queue.Offer(3)
-	queue.Offer(4)
+	queue.Offer(2)
 	queue.Offer(5)
-	t.Log("队列 queue = ", queue.toString())
+	queue.Offer(4)
+	fmt.Print("队列 queue = ")
+	PrintList(queue.toList())
 
 	// 访问队首元素
 	peek := queue.Peek()
-	t.Log("队首元素 peek = ", peek)
+	fmt.Println("队首元素 peek =", peek)
 
 	// 元素出队
-	pop := queue.Poll()
-	t.Log("出队元素 pop  = ", pop, ", 出队后 queue =", queue.toString())
+	poll := queue.Poll()
+	fmt.Print("出队元素 poll = ", poll, ", 出队后 queue = ")
+	PrintList(queue.toList())
 
 	// 获取队的长度
 	size := queue.Size()
-	t.Log("队的长度 size = ", size)
+	fmt.Println("队的长度 size =", size)
 
 	// 判断是否为空
 	isEmpty := queue.IsEmpty()
-	t.Log("队是否为空 = ", isEmpty)
+	fmt.Println("队是否为空 =", isEmpty)
 }
 
 // BenchmarkArrayQueue 8 ns/op in Mac M1 Pro
diff --git a/codes/go/chapter_stack_and_queue/stack.go b/codes/go/chapter_stack_and_queue/stack.go
deleted file mode 100644
index 7795387..0000000
--- a/codes/go/chapter_stack_and_queue/stack.go
+++ /dev/null
@@ -1,20 +0,0 @@
-// File: stack.go
-// Created Time: 2022-11-26
-// Author: Reanon (793584285@qq.com)
-
-package chapter_stack_and_queue
-
-type Stack interface {
-	// Push 元素入栈
-	Push(num int)
-	// Peek 访问栈顶元素
-	Peek() any
-	// Pop 元素出栈
-	Pop() any
-	// Size 栈的长度
-	Size() int
-	// IsEmpty 栈是否为空
-	IsEmpty() bool
-	// toString 栈输出为字符串
-	toString() string
-}
diff --git a/codes/go/chapter_stack_and_queue/stack_test.go b/codes/go/chapter_stack_and_queue/stack_test.go
index 95c6d24..9dc97e6 100644
--- a/codes/go/chapter_stack_and_queue/stack_test.go
+++ b/codes/go/chapter_stack_and_queue/stack_test.go
@@ -4,65 +4,105 @@
 
 package chapter_stack_and_queue
 
-import "testing"
+import (
+	"fmt"
+	"testing"
+
+	. "github.com/krahets/hello-algo/pkg"
+)
+
+func TestStack(t *testing.T) {
+	/* 初始化栈 */
+	// 在 Go 中，推荐将 Slice 当作栈来使用
+	var stack []int
+
+	/* 元素入栈 */
+	stack = append(stack, 1)
+	stack = append(stack, 3)
+	stack = append(stack, 2)
+	stack = append(stack, 5)
+	stack = append(stack, 4)
+	fmt.Print("栈 = ")
+	PrintSlice(stack)
+
+	/* 访问栈顶元素 */
+	peek := stack[len(stack)-1]
+	fmt.Println("栈顶元素 peek =", peek)
+
+	/* 元素出栈 */
+	pop := stack[len(stack)-1]
+	stack = stack[:len(stack)-1]
+	fmt.Print("出栈元素 pop = ", pop, "，出栈后 stack = ")
+	PrintSlice(stack)
+
+	/* 获取栈的长度 */
+	size := len(stack)
+	fmt.Println("栈的长度 size =", size)
+
+	/* 判断是否为空 */
+	isEmpty := len(stack) == 0
+	fmt.Println("栈是否为空 =", isEmpty)
+}
 
 func TestArrayStack(t *testing.T) {
 	// 初始化栈, 使用接口承接
-	var stack Stack
-	stack = NewArrayStack()
+	stack := NewArrayStack()
 
 	// 元素入栈
 	stack.Push(1)
-	stack.Push(2)
 	stack.Push(3)
-	stack.Push(4)
+	stack.Push(2)
 	stack.Push(5)
-	t.Log("栈 stack = ", stack.toString())
+	stack.Push(4)
+	fmt.Print("栈 stack = ")
+	PrintSlice(stack.toSlice())
 
 	// 访问栈顶元素
 	peek := stack.Peek()
-	t.Log("栈顶元素 peek = ", peek)
+	fmt.Println("栈顶元素 peek =", peek)
 
 	// 元素出栈
 	pop := stack.Pop()
-	t.Log("出栈元素 pop  = ", pop, ", 出栈后 stack =", stack.toString())
+	fmt.Print("出栈元素 pop = ", pop, ", 出栈后 stack = ")
+	PrintSlice(stack.toSlice())
 
 	// 获取栈的长度
 	size := stack.Size()
-	t.Log("栈的长度 size = ", size)
+	fmt.Println("栈的长度 size =", size)
 
 	// 判断是否为空
 	isEmpty := stack.IsEmpty()
-	t.Log("栈是否为空 = ", isEmpty)
+	fmt.Println("栈是否为空 =", isEmpty)
 }
 
 func TestLinkedListStack(t *testing.T) {
 	// 初始化栈
-	var stack Stack
-	stack = NewLinkedListStack()
+	stack := NewLinkedListStack()
 	// 元素入栈
 	stack.Push(1)
-	stack.Push(2)
 	stack.Push(3)
-	stack.Push(4)
+	stack.Push(2)
 	stack.Push(5)
-	t.Log("栈 stack = ", stack.toString())
+	stack.Push(4)
+	fmt.Print("栈 stack = ")
+	PrintList(stack.toList())
 
 	// 访问栈顶元素
 	peek := stack.Peek()
-	t.Log("栈顶元素 peek = ", peek)
+	fmt.Println("栈顶元素 peek =", peek)
 
 	// 元素出栈
 	pop := stack.Pop()
-	t.Log("出栈元素 pop  = ", pop, ", 出栈后 stack =", stack.toString())
+	fmt.Print("出栈元素 pop = ", pop, ", 出栈后 stack = ")
+	PrintList(stack.toList())
 
 	// 获取栈的长度
 	size := stack.Size()
-	t.Log("栈的长度 size = ", size)
+	fmt.Println("栈的长度 size =", size)
 
 	// 判断是否为空
 	isEmpty := stack.IsEmpty()
-	t.Log("栈是否为空 = ", isEmpty)
+	fmt.Println("栈是否为空 =", isEmpty)
 }
 
 // BenchmarkArrayStack 8 ns/op in Mac M1 Pro
diff --git a/codes/go/chapter_tree/binary_search_tree.go b/codes/go/chapter_tree/binary_search_tree.go
index ac14e79..2af2e7b 100644
--- a/codes/go/chapter_tree/binary_search_tree.go
+++ b/codes/go/chapter_tree/binary_search_tree.go
@@ -53,7 +53,7 @@ func (bst *BinarySearchTree) GetInorderNext(node *TreeNode) *TreeNode {
 	return node
 }
 
-// Search node of binary search tree
+/* 查找结点 */
 func (bst *BinarySearchTree) Search(num int) *TreeNode {
 	node := bst.root
 	// 循环查找，越过叶结点后跳出
@@ -73,7 +73,7 @@ func (bst *BinarySearchTree) Search(num int) *TreeNode {
 	return node
 }
 
-// Insert node of binary search tree
+/* 插入结点 */
 func (bst *BinarySearchTree) Insert(num int) *TreeNode {
 	cur := bst.root
 	// 若树为空，直接提前返回
@@ -104,7 +104,7 @@ func (bst *BinarySearchTree) Insert(num int) *TreeNode {
 	return cur
 }
 
-// Remove node of binary search tree
+/* 删除结点 */
 func (bst *BinarySearchTree) Remove(num int) *TreeNode {
 	cur := bst.root
 	// 若树为空，直接提前返回
@@ -119,8 +119,8 @@ func (bst *BinarySearchTree) Remove(num int) *TreeNode {
 			break
 		}
 		prev = cur
-		// 待删除结点在右子树中
 		if cur.Val < num {
+			// 待删除结点在右子树中
 			cur = cur.Right
 		} else {
 			// 待删除结点在左子树中
@@ -146,8 +146,8 @@ func (bst *BinarySearchTree) Remove(num int) *TreeNode {
 		} else {
 			prev.Right = child
 		}
-
-	} else { // 子结点数为 2
+		// 子结点数为 2
+	} else {
 		// 获取中序遍历中待删除结点 cur 的下一个结点
 		next := bst.GetInorderNext(cur)
 		temp := next.Val
@@ -156,7 +156,6 @@ func (bst *BinarySearchTree) Remove(num int) *TreeNode {
 		// 将 next 的值复制给 cur
 		cur.Val = temp
 	}
-	// TODO: add error handler, don't return node
 	return cur
 }
 
diff --git a/codes/go/chapter_tree/binary_search_tree_test.go b/codes/go/chapter_tree/binary_search_tree_test.go
index 5ae932b..0d0369a 100644
--- a/codes/go/chapter_tree/binary_search_tree_test.go
+++ b/codes/go/chapter_tree/binary_search_tree_test.go
@@ -4,38 +4,41 @@
 
 package chapter_tree
 
-import "testing"
+import (
+	"fmt"
+	"testing"
+)
 
 func TestBinarySearchTree(t *testing.T) {
 	nums := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
 	bst := NewBinarySearchTree(nums)
-	t.Log("初始化的二叉树为:")
+	fmt.Println("初始化的二叉树为:")
 	bst.Print()
 
 	// 获取根结点
 	node := bst.GetRoot()
-	t.Log("二叉树的根结点为:", node.Val)
+	fmt.Println("二叉树的根结点为:", node.Val)
 	// 获取最小的结点
 	node = bst.GetMin(bst.GetRoot())
-	t.Log("二叉树的最小结点为:", node.Val)
+	fmt.Println("二叉树的最小结点为:", node.Val)
 
 	// 查找结点
 	node = bst.Search(5)
-	t.Log("查找到的结点对象为", node, "，结点值 =", node.Val)
+	fmt.Println("查找到的结点对象为", node, "，结点值 =", node.Val)
 
 	// 插入结点
 	node = bst.Insert(16)
-	t.Log("插入结点后 16 的二叉树为:")
+	fmt.Println("插入结点后 16 的二叉树为:")
 	bst.Print()
 
 	// 删除结点
 	bst.Remove(1)
-	t.Log("删除结点 1 后的二叉树为:")
+	fmt.Println("删除结点 1 后的二叉树为:")
 	bst.Print()
 	bst.Remove(2)
-	t.Log("删除结点 2 后的二叉树为:")
+	fmt.Println("删除结点 2 后的二叉树为:")
 	bst.Print()
 	bst.Remove(4)
-	t.Log("删除结点 4 后的二叉树为:")
+	fmt.Println("删除结点 4 后的二叉树为:")
 	bst.Print()
 }
diff --git a/codes/go/chapter_tree/binary_tree.go b/codes/go/chapter_tree/binary_tree.go
deleted file mode 100644
index 72143cd..0000000
--- a/codes/go/chapter_tree/binary_tree.go
+++ /dev/null
@@ -1,23 +0,0 @@
-// File: binary_tree.go
-// Created Time: 2022-11-25
-// Author: Reanon (793584285@qq.com)
-
-package chapter_tree
-
-import (
-	. "github.com/krahets/hello-algo/pkg"
-)
-
-type BinaryTree struct {
-	root *TreeNode
-}
-
-func NewBinaryTree(node *TreeNode) *BinaryTree {
-	return &BinaryTree{
-		root: node,
-	}
-}
-
-func (tree *BinaryTree) Print() {
-	PrintTree(tree.root)
-}
diff --git a/codes/go/chapter_tree/binary_tree_bfs.go b/codes/go/chapter_tree/binary_tree_bfs.go
index 5c07a96..d77bc97 100644
--- a/codes/go/chapter_tree/binary_tree_bfs.go
+++ b/codes/go/chapter_tree/binary_tree_bfs.go
@@ -10,11 +10,10 @@ import (
 	. "github.com/krahets/hello-algo/pkg"
 )
 
-// levelOrder Breadth First Search
+/* 层序遍历 */
 func levelOrder(root *TreeNode) []int {
-	// Let container.list as queue
-	queue := list.New()
 	// 初始化队列，加入根结点
+	queue := list.New()
 	queue.PushBack(root)
 	// 初始化一个切片，用于保存遍历序列
 	nums := make([]int, 0)
diff --git a/codes/go/chapter_tree/binary_tree_bfs_test.go b/codes/go/chapter_tree/binary_tree_bfs_test.go
index c06cd9e..8d5c0aa 100644
--- a/codes/go/chapter_tree/binary_tree_bfs_test.go
+++ b/codes/go/chapter_tree/binary_tree_bfs_test.go
@@ -5,6 +5,7 @@
 package chapter_tree
 
 import (
+	"fmt"
 	"testing"
 
 	. "github.com/krahets/hello-algo/pkg"
@@ -14,10 +15,10 @@ func TestLevelOrder(t *testing.T) {
 	/* 初始化二叉树 */
 	// 这里借助了一个从数组直接生成二叉树的函数
 	root := ArrayToTree([]int{1, 2, 3, 4, 5, 6, 7})
-	t.Log("初始化二叉树: ")
+	fmt.Println("初始化二叉树: ")
 	PrintTree(root)
 
 	// 层序遍历
 	nums := levelOrder(root)
-	t.Log("层序遍历的结点打印序列 =", nums)
+	fmt.Println("层序遍历的结点打印序列 =", nums)
 }
diff --git a/codes/go/chapter_tree/binary_tree_dfs.go b/codes/go/chapter_tree/binary_tree_dfs.go
index c97aa17..1a857eb 100644
--- a/codes/go/chapter_tree/binary_tree_dfs.go
+++ b/codes/go/chapter_tree/binary_tree_dfs.go
@@ -8,56 +8,37 @@ import (
 	. "github.com/krahets/hello-algo/pkg"
 )
 
-// preOrder 前序遍历
-func preOrder(root *TreeNode) (nums []int) {
-	var preOrderHelper func(node *TreeNode)
-	// 匿名函数
-	preOrderHelper = func(node *TreeNode) {
-		if node == nil {
-			return
-		}
-		// 访问优先级：根结点 -> 左子树 -> 右子树
-		nums = append(nums, node.Val)
-		preOrderHelper(node.Left)
-		preOrderHelper(node.Right)
+var nums []int
+
+/* 前序遍历 */
+func preOrder(node *TreeNode) {
+	if node == nil {
+		return
 	}
-	// 函数调用
-	preOrderHelper(root)
-	return
+	// 访问优先级：根结点 -> 左子树 -> 右子树
+	nums = append(nums, node.Val)
+	preOrder(node.Left)
+	preOrder(node.Right)
 }
 
-// inOrder 中序遍历
-func inOrder(root *TreeNode) (nums []int) {
-	var inOrderHelper func(node *TreeNode)
-	// 匿名函数
-	inOrderHelper = func(node *TreeNode) {
-		if node == nil {
-			return
-		}
-		// 访问优先级：左子树 -> 根结点 -> 右子树
-		inOrderHelper(node.Left)
-		nums = append(nums, node.Val)
-		inOrderHelper(node.Right)
+/* 中序遍历 */
+func inOrder(node *TreeNode) {
+	if node == nil {
+		return
 	}
-	// 函数调用
-	inOrderHelper(root)
-	return
+	// 访问优先级：左子树 -> 根结点 -> 右子树
+	inOrder(node.Left)
+	nums = append(nums, node.Val)
+	inOrder(node.Right)
 }
 
-// postOrder 后序遍历
-func postOrder(root *TreeNode) (nums []int) {
-	var postOrderHelper func(node *TreeNode)
-	// 匿名函数
-	postOrderHelper = func(node *TreeNode) {
-		if node == nil {
-			return
-		}
-		// 访问优先级：左子树 -> 右子树 -> 根结点
-		postOrderHelper(node.Left)
-		postOrderHelper(node.Right)
-		nums = append(nums, node.Val)
+/* 后序遍历 */
+func postOrder(node *TreeNode) {
+	if node == nil {
+		return
 	}
-	// 函数调用
-	postOrderHelper(root)
-	return
+	// 访问优先级：左子树 -> 右子树 -> 根结点
+	postOrder(node.Left)
+	postOrder(node.Right)
+	nums = append(nums, node.Val)
 }
diff --git a/codes/go/chapter_tree/binary_tree_dfs_test.go b/codes/go/chapter_tree/binary_tree_dfs_test.go
index 2ee6295..67a3e1f 100644
--- a/codes/go/chapter_tree/binary_tree_dfs_test.go
+++ b/codes/go/chapter_tree/binary_tree_dfs_test.go
@@ -5,6 +5,7 @@
 package chapter_tree
 
 import (
+	"fmt"
 	"testing"
 
 	. "github.com/krahets/hello-algo/pkg"
@@ -14,18 +15,21 @@ func TestPreInPostOrderTraversal(t *testing.T) {
 	/* 初始化二叉树 */
 	// 这里借助了一个从数组直接生成二叉树的函数
 	root := ArrayToTree([]int{1, 2, 3, 4, 5, 6, 7})
-	t.Log("初始化二叉树: ")
+	fmt.Println("初始化二叉树: ")
 	PrintTree(root)
 
 	// 前序遍历
-	nums := preOrder(root)
-	t.Log("前序遍历的结点打印序列 =", nums)
+	nums = nil
+	preOrder(root)
+	fmt.Println("前序遍历的结点打印序列 =", nums)
 
 	// 中序遍历
-	nums = inOrder(root)
-	t.Log("中序遍历的结点打印序列 =", nums)
+	nums = nil
+	inOrder(root)
+	fmt.Println("中序遍历的结点打印序列 =", nums)
 
 	// 后序遍历
-	nums = postOrder(root)
-	t.Log("后序遍历的结点打印序列 =", nums)
+	nums = nil
+	postOrder(root)
+	fmt.Println("后序遍历的结点打印序列 =", nums)
 }
diff --git a/codes/go/chapter_tree/binary_tree_test.go b/codes/go/chapter_tree/binary_tree_test.go
index 03a8553..f91e816 100644
--- a/codes/go/chapter_tree/binary_tree_test.go
+++ b/codes/go/chapter_tree/binary_tree_test.go
@@ -5,6 +5,7 @@
 package chapter_tree
 
 import (
+	"fmt"
 	"testing"
 
 	. "github.com/krahets/hello-algo/pkg"
@@ -18,24 +19,23 @@ func TestBinaryTree(t *testing.T) {
 	n3 := NewTreeNode(3)
 	n4 := NewTreeNode(4)
 	n5 := NewTreeNode(5)
-
-	tree := NewBinaryTree(n1)
+	// 构建引用指向（即指针）
 	n1.Left = n2
 	n1.Right = n3
 	n2.Left = n4
 	n2.Right = n5
-	t.Log("初始化二叉树")
-	tree.Print()
+	fmt.Println("初始化二叉树")
+	PrintTree(n1)
 
 	/* 插入与删除结点 */
+	// 插入结点
 	p := NewTreeNode(0)
 	n1.Left = p
 	p.Left = n2
-	t.Log("插入结点 P 后")
-	tree.Print()
-
+	fmt.Println("插入结点 P 后")
+	PrintTree(n1)
 	// 删除结点
 	n1.Left = n2
-	t.Log("删除结点 P 后")
-	tree.Print()
+	fmt.Println("删除结点 P 后")
+	PrintTree(n1)
 }
diff --git a/codes/go/pkg/list_node.go b/codes/go/pkg/list_node.go
index 6795111..f1c152d 100644
--- a/codes/go/pkg/list_node.go
+++ b/codes/go/pkg/list_node.go
@@ -4,12 +4,6 @@
 
 package pkg
 
-import (
-	"fmt"
-	"strconv"
-	"strings"
-)
-
 // ListNode Definition for a singly-linked list node
 type ListNode struct {
 	Next *ListNode
@@ -43,17 +37,3 @@ func GetListNode(node *ListNode, val int) *ListNode {
 	}
 	return node
 }
-
-// PrintLinkedList Print a linked list
-func PrintLinkedList(node *ListNode) {
-	if node == nil {
-		return
-	}
-	var builder strings.Builder
-	for node.Next != nil {
-		builder.WriteString(strconv.Itoa(node.Val) + " -> ")
-		node = node.Next
-	}
-	builder.WriteString(strconv.Itoa(node.Val))
-	fmt.Println(builder.String())
-}
diff --git a/codes/go/pkg/list_node_test.go b/codes/go/pkg/list_node_test.go
index 5bc33d9..31b9961 100644
--- a/codes/go/pkg/list_node_test.go
+++ b/codes/go/pkg/list_node_test.go
@@ -4,7 +4,10 @@
 
 package pkg
 
-import "testing"
+import (
+	"fmt"
+	"testing"
+)
 
 func TestListNode(t *testing.T) {
 	arr := []int{2, 3, 5, 6, 7}
@@ -12,5 +15,5 @@ func TestListNode(t *testing.T) {
 
 	PrintLinkedList(head)
 	node := GetListNode(head, 5)
-	t.Log("Find node: ", node.Val)
+	fmt.Println("Find node: ", node.Val)
 }
diff --git a/codes/go/pkg/print_utils.go b/codes/go/pkg/print_utils.go
new file mode 100644
index 0000000..e42d406
--- /dev/null
+++ b/codes/go/pkg/print_utils.go
@@ -0,0 +1,98 @@
+// File: print_utils.go
+// Created Time: 2022-12-03
+// Author: Reanon (793584285@qq.com), Krahets (krahets@163.com)
+
+package pkg
+
+import (
+	"container/list"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func PrintSlice(nums []int) {
+	fmt.Printf("%v", nums)
+	fmt.Println()
+}
+
+// PrintList Print a list
+func PrintList(list *list.List) {
+	e := list.Front()
+	// 强转为 string, 会影响效率
+	fmt.Print("[")
+	for e.Next() != nil {
+		fmt.Print(e.Value, " ")
+		e = e.Next()
+	}
+	fmt.Print(e.Value, "]\n")
+}
+
+// PrintLinkedList Print a linked list
+func PrintLinkedList(node *ListNode) {
+	if node == nil {
+		return
+	}
+	var builder strings.Builder
+	for node.Next != nil {
+		builder.WriteString(strconv.Itoa(node.Val) + " -> ")
+		node = node.Next
+	}
+	builder.WriteString(strconv.Itoa(node.Val))
+	fmt.Println(builder.String())
+}
+
+// PrintTree Print a binary tree
+func PrintTree(root *TreeNode) {
+	printTreeHelper(root, nil, false)
+}
+
+// printTreeHelper Help to print a binary tree, hide more details
+// This tree printer is borrowed from TECHIE DELIGHT
+// https://www.techiedelight.com/c-program-print-binary-tree/
+func printTreeHelper(root *TreeNode, prev *trunk, isLeft bool) {
+	if root == nil {
+		return
+	}
+	prevStr := "    "
+	trunk := newTrunk(prev, prevStr)
+	printTreeHelper(root.Right, trunk, true)
+	if prev == nil {
+		trunk.str = "———"
+	} else if isLeft {
+		trunk.str = "/———"
+		prevStr = "   |"
+	} else {
+		trunk.str = "\\———"
+		prev.str = prevStr
+	}
+	showTrunk(trunk)
+	fmt.Println(root.Val)
+	if prev != nil {
+		prev.str = prevStr
+	}
+	trunk.str = "   |"
+	printTreeHelper(root.Left, trunk, false)
+}
+
+// trunk Help to Print tree structure
+type trunk struct {
+	prev *trunk
+	str  string
+}
+
+func newTrunk(prev *trunk, str string) *trunk {
+	return &trunk{
+		prev: prev,
+		str:  str,
+	}
+}
+
+func showTrunk(t *trunk) {
+	if t == nil {
+		return
+	}
+
+	showTrunk(t.prev)
+	fmt.Print(t.str)
+}
diff --git a/codes/go/pkg/tree_node.go b/codes/go/pkg/tree_node.go
index b62dc60..2511a76 100644
--- a/codes/go/pkg/tree_node.go
+++ b/codes/go/pkg/tree_node.go
@@ -6,7 +6,6 @@ package pkg
 
 import (
 	"container/list"
-	"fmt"
 )
 
 type TreeNode struct {
@@ -71,58 +70,3 @@ func TreeToArray(root *TreeNode) []any {
 	}
 	return arr
 }
-
-// PrintTree Print a binary tree
-func PrintTree(root *TreeNode) {
-	printTreeHelper(root, nil, false)
-}
-
-// printTreeHelper Help to print a binary tree, hide more details
-// This tree printer is borrowed from TECHIE DELIGHT
-// https://www.techiedelight.com/c-program-print-binary-tree/
-func printTreeHelper(root *TreeNode, prev *trunk, isLeft bool) {
-	if root == nil {
-		return
-	}
-	prevStr := "    "
-	trunk := newTrunk(prev, prevStr)
-	printTreeHelper(root.Right, trunk, true)
-	if prev == nil {
-		trunk.str = "———"
-	} else if isLeft {
-		trunk.str = "/———"
-		prevStr = "   |"
-	} else {
-		trunk.str = "\\———"
-		prev.str = prevStr
-	}
-	showTrunk(trunk)
-	fmt.Println(root.Val)
-	if prev != nil {
-		prev.str = prevStr
-	}
-	trunk.str = "   |"
-	printTreeHelper(root.Left, trunk, false)
-}
-
-// trunk Help to Print tree structure
-type trunk struct {
-	prev *trunk
-	str  string
-}
-
-func newTrunk(prev *trunk, str string) *trunk {
-	return &trunk{
-		prev: prev,
-		str:  str,
-	}
-}
-
-func showTrunk(t *trunk) {
-	if t == nil {
-		return
-	}
-
-	showTrunk(t.prev)
-	fmt.Print(t.str)
-}
diff --git a/codes/go/pkg/tree_node_test.go b/codes/go/pkg/tree_node_test.go
index ffbdf6f..b4c8e07 100644
--- a/codes/go/pkg/tree_node_test.go
+++ b/codes/go/pkg/tree_node_test.go
@@ -4,7 +4,10 @@
 
 package pkg
 
-import "testing"
+import (
+	"fmt"
+	"testing"
+)
 
 func TestTreeNode(t *testing.T) {
 	arr := []int{2, 3, 5, 6, 7}
@@ -14,5 +17,5 @@ func TestTreeNode(t *testing.T) {
 	PrintTree(node)
 
 	// tree to arr
-	t.Log(TreeToArray(node))
+	fmt.Println(TreeToArray(node))
 }
diff --git a/codes/java/chapter_stack_and_queue/deque.java b/codes/java/chapter_stack_and_queue/deque.java
index cdfe65b..a29e6e7 100644
--- a/codes/java/chapter_stack_and_queue/deque.java
+++ b/codes/java/chapter_stack_and_queue/deque.java
@@ -21,7 +21,7 @@ public class deque {
         deque.offerFirst(1);
         System.out.println("双向队列 deque = " + deque);
 
-        /* 访问队首元素 */
+        /* 访问元素 */
         int peekFirst = deque.peekFirst();
         System.out.println("队首元素 peekFirst = " + peekFirst);
         int peekLast = deque.peekLast();
diff --git a/codes/javascript/chapter_array_and_linkedlist/array.js b/codes/javascript/chapter_array_and_linkedlist/array.js
index a8294cc..4cf1b29 100644
--- a/codes/javascript/chapter_array_and_linkedlist/array.js
+++ b/codes/javascript/chapter_array_and_linkedlist/array.js
@@ -7,7 +7,7 @@
 /* 随机访问元素 */
 function randomAccess(nums){
     // 在区间 [0, nums.length) 中随机抽取一个数字
-    const random_index  = Math.floor(Math.random() * nums.length)
+    const random_index = Math.floor(Math.random() * nums.length)
     // 获取并返回随机元素
     random_num = nums[random_index]
     return random_num
diff --git a/codes/javascript/chapter_sorting/insertion_sort.js b/codes/javascript/chapter_sorting/insertion_sort.js
index 9a6f119..02c45a2 100644
--- a/codes/javascript/chapter_sorting/insertion_sort.js
+++ b/codes/javascript/chapter_sorting/insertion_sort.js
@@ -21,4 +21,4 @@ function insertionSort(nums) {
 /* Driver Code */
 var nums = [4, 1, 3, 1, 5, 2]
 insertionSort(nums)
-console.log("排序后数组 nums = ", nums)
+console.log("排序后数组 nums =", nums)
diff --git a/codes/python/chapter_array_and_linkedlist/list.py b/codes/python/chapter_array_and_linkedlist/list.py
index 4cd9b03..ac71b98 100644
--- a/codes/python/chapter_array_and_linkedlist/list.py
+++ b/codes/python/chapter_array_and_linkedlist/list.py
@@ -33,7 +33,7 @@ if __name__ == "__main__":
     list.append(2)
     list.append(5)
     list.append(4)
-    print("添加元素后 list = ", list)
+    print("添加元素后 list =", list)
 
     """ 中间插入元素 """
     list.insert(3, 6)
diff --git a/codes/python/chapter_sorting/insertion_sort.py b/codes/python/chapter_sorting/insertion_sort.py
index 9f32673..db85515 100644
--- a/codes/python/chapter_sorting/insertion_sort.py
+++ b/codes/python/chapter_sorting/insertion_sort.py
@@ -25,4 +25,4 @@ def insertion_sort(nums):
 if __name__ == '__main__':
     nums = [4, 1, 3, 1, 5, 2]
     insertion_sort(nums)
-    print("排序后数组 nums = ", nums)
+    print("排序后数组 nums =", nums)
diff --git a/codes/python/chapter_stack_and_queue/deque.py b/codes/python/chapter_stack_and_queue/deque.py
index 8a68fe7..7881a96 100644
--- a/codes/python/chapter_stack_and_queue/deque.py
+++ b/codes/python/chapter_stack_and_queue/deque.py
@@ -26,7 +26,7 @@ if __name__ == "__main__":
     duque.appendleft(1)
     print("双向队列 duque =", duque)
 
-    """ 访问队首元素 """
+    """ 访问元素 """
     front = duque[0]  # 队首元素
     print("队首元素 front =", front)
     rear = duque[-1]  # 队尾元素
diff --git a/docs/chapter_array_and_linkedlist/array.md b/docs/chapter_array_and_linkedlist/array.md
index 74e2063..fcd7e45 100644
--- a/docs/chapter_array_and_linkedlist/array.md
+++ b/docs/chapter_array_and_linkedlist/array.md
@@ -138,7 +138,7 @@ elementAddr = firtstElementAddr + elementLength * elementIndex
     /* 随机返回一个数组元素 */
     function randomAccess(nums){
         // 在区间 [0, nums.length) 中随机抽取一个数字
-        const random_index  = Math.floor(Math.random() * nums.length)
+        const random_index = Math.floor(Math.random() * nums.length)
         // 获取并返回随机元素
         random_num = nums[random_index]
         return random_num
diff --git a/docs/chapter_computational_complexity/space_complexity.md b/docs/chapter_computational_complexity/space_complexity.md
index eda9013..ac2c9df 100644
--- a/docs/chapter_computational_complexity/space_complexity.md
+++ b/docs/chapter_computational_complexity/space_complexity.md
@@ -520,7 +520,7 @@ $$
     ```python title="space_complexity_types.py"
     """ 线性阶（递归实现） """
     def linearRecur(n):
-        print("递归 n = ", n)
+        print("递归 n =", n)
         if n == 1: return
         linearRecur(n - 1)
     ```
diff --git a/docs/chapter_computational_complexity/time_complexity.md b/docs/chapter_computational_complexity/time_complexity.md
index 5555252..9ee13d8 100644
--- a/docs/chapter_computational_complexity/time_complexity.md
+++ b/docs/chapter_computational_complexity/time_complexity.md
@@ -15,7 +15,7 @@ comments: true
 例如以下代码，输入数据大小为 $n$ ，根据以上方法，可以得到算法运行时间为 $6n + 12$ ns 。
 
 $$
-1 + 1 + 10 + (1 + 5) \times n  = 6n + 12
+1 + 1 + 10 + (1 + 5) \times n = 6n + 12
 $$
 
 === "Java"
diff --git a/docs/chapter_stack_and_queue/deque.md b/docs/chapter_stack_and_queue/deque.md
index 2ed2f28..c764ca6 100644
--- a/docs/chapter_stack_and_queue/deque.md
+++ b/docs/chapter_stack_and_queue/deque.md
@@ -46,7 +46,7 @@ comments: true
     deque.offerFirst(3);  // 添加至队首
     deque.offerFirst(1);
 
-    /* 访问队首元素 */
+    /* 访问元素 */
     int peekFirst = deque.peekFirst();  // 队首元素
     int peekLast = deque.peekLast();    // 队尾元素
 
@@ -74,7 +74,7 @@ comments: true
     deque.push_front(3);  // 添加至队首
     deque.push_front(1);
 
-    /* 访问队首元素 */
+    /* 访问元素 */
     int front = deque.front(); // 队首元素
     int back = deque.back();   // 队尾元素
 
@@ -102,7 +102,7 @@ comments: true
     duque.appendleft(3)  # 添加至队首
     duque.appendleft(1)
 
-    """ 访问队首元素 """
+    """ 访问元素 """
     front = duque[0]  # 队首元素
     rear = duque[-1]  # 队尾元素
 
@@ -120,7 +120,30 @@ comments: true
 === "Go"
 
     ```go title="deque.go"
+    /* 初始化双向队列 */
+    // 在 Go 中，将 list 作为双向队列使用
+    deque := list.New()
 
+    /* 元素入队 */
+    deque.PushBack(2)      // 添加至队尾
+    deque.PushBack(5)
+    deque.PushBack(4)
+    deque.PushFront(3)     // 添加至队首
+    deque.PushFront(1)
+
+    /* 访问元素 */
+    front := deque.Front() // 队首元素
+    rear := deque.Back()   // 队尾元素
+
+    /* 元素出队 */
+    deque.Remove(front)    // 队首元素出队
+    deque.Remove(rear)     // 队尾元素出队
+
+    /* 获取双向队列的长度 */
+    size := deque.Len()
+
+    /* 判断双向队列是否为空 */
+    isEmpty := deque.Len() == 0
     ```
 
 === "JavaScript"
diff --git a/docs/chapter_stack_and_queue/queue.md b/docs/chapter_stack_and_queue/queue.md
index f443f21..a663b97 100644
--- a/docs/chapter_stack_and_queue/queue.md
+++ b/docs/chapter_stack_and_queue/queue.md
@@ -115,7 +115,29 @@ comments: true
 === "Go"
 
     ```go title="queue.go"
+    /* 初始化队列 */
+    // 在 Go 中，将 list 作为队列来使用
+    queue := list.New()
 
+    /* 元素入队 */
+    queue.PushBack(1)
+    queue.PushBack(3)
+    queue.PushBack(2)
+    queue.PushBack(5)
+    queue.PushBack(4)
+
+    /* 访问队首元素 */
+    peek := queue.Front()
+
+    /* 元素出队 */
+    poll := queue.Front()
+    queue.Remove(poll)
+
+    /* 获取队列的长度 */
+    size := queue.Len()
+
+    /* 判断队列是否为空 */
+    isEmpty := queue.Len() == 0
     ```
 
 === "JavaScript"
@@ -309,7 +331,52 @@ comments: true
 === "Go"
 
     ```go title="linkedlist_queue.go"
+    /* 基于链表实现的队列 */
+    type LinkedListQueue struct {
+        // 使用内置包 list 来实现队列
+        data *list.List
+    }
 
+    // NewLinkedListQueue 初始化链表
+    func NewLinkedListQueue() *LinkedListQueue {
+        return &LinkedListQueue{
+            data: list.New(),
+        }
+    }
+
+    // Offer 入队
+    func (s *LinkedListQueue) Offer(value any) {
+        s.data.PushBack(value)
+    }
+
+    // Poll 出队
+    func (s *LinkedListQueue) Poll() any {
+        if s.IsEmpty() {
+            return nil
+        }
+        e := s.data.Front()
+        s.data.Remove(e)
+        return e.Value
+    }
+
+    // Peek 访问队首元素
+    func (s *LinkedListQueue) Peek() any {
+        if s.IsEmpty() {
+            return nil
+        }
+        e := s.data.Front()
+        return e.Value
+    }
+
+    // Size 获取队列的长度
+    func (s *LinkedListQueue) Size() int {
+        return s.data.Len()
+    }
+
+    // IsEmpty 判断队列是否为空
+    func (s *LinkedListQueue) IsEmpty() bool {
+        return s.data.Len() == 0
+    }
     ```
 
 === "JavaScript"
@@ -540,7 +607,66 @@ comments: true
 === "Go"
 
     ```go title="array_queue.go"
+    /* 基于环形数组实现的队列 */
+    type ArrayQueue struct {
+        data     []int // 用于存储队列元素的数组
+        capacity int   // 队列容量（即最多容量的元素个数）
+        front    int   // 头指针，指向队首
+        rear     int   // 尾指针，指向队尾 + 1
+    }
 
+    // NewArrayQueue 基于环形数组实现的队列
+    func NewArrayQueue(capacity int) *ArrayQueue {
+        return &ArrayQueue{
+            data:     make([]int, capacity),
+            capacity: capacity,
+            front:    0,
+            rear:     0,
+        }
+    }
+
+    // Size 获取队列的长度
+    func (q *ArrayQueue) Size() int {
+        size := (q.capacity + q.rear - q.front) % q.capacity
+        return size
+    }
+
+    // IsEmpty 判断队列是否为空
+    func (q *ArrayQueue) IsEmpty() bool {
+        return q.rear-q.front == 0
+    }
+
+    // Offer 入队
+    func (q *ArrayQueue) Offer(v int) {
+        // 当 rear == capacity 表示队列已满
+        if q.Size() == q.capacity {
+            return
+        }
+        // 尾结点后添加
+        q.data[q.rear] = v
+        // 尾指针向后移动一位，越过尾部后返回到数组头部
+        q.rear = (q.rear + 1) % q.capacity
+    }
+
+    // Poll 出队
+    func (q *ArrayQueue) Poll() any {
+        if q.IsEmpty() {
+            return nil
+        }
+        v := q.data[q.front]
+        // 队头指针向后移动一位，若越过尾部则返回到数组头部
+        q.front = (q.front + 1) % q.capacity
+        return v
+    }
+
+    // Peek 访问队首元素
+    func (q *ArrayQueue) Peek() any {
+        if q.IsEmpty() {
+            return nil
+        }
+        v := q.data[q.front]
+        return v
+    }
     ```
 
 === "JavaScript"
diff --git a/docs/chapter_stack_and_queue/stack.md b/docs/chapter_stack_and_queue/stack.md
index c2a1ad1..80870a0 100644
--- a/docs/chapter_stack_and_queue/stack.md
+++ b/docs/chapter_stack_and_queue/stack.md
@@ -115,7 +115,29 @@ comments: true
 === "Go"
 
     ```go title="stack.go"
+    /* 初始化栈 */
+    // 在 Go 中，推荐将 Slice 当作栈来使用
+    var stack []int
 
+    /* 元素入栈 */
+    stack = append(stack, 1)
+    stack = append(stack, 3)
+    stack = append(stack, 2)
+    stack = append(stack, 5)
+    stack = append(stack, 4)
+
+    /* 访问栈顶元素 */
+    peek := stack[len(stack)-1]
+
+    /* 元素出栈 */
+    pop := stack[len(stack)-1]
+    stack = stack[:len(stack)-1]
+
+    /* 获取栈的长度 */
+    size := len(stack)
+
+    /* 判断是否为空 */
+    isEmpty := len(stack) == 0
     ```
 
 === "JavaScript"
@@ -282,7 +304,52 @@ comments: true
 === "Go"
 
     ```go title="linkedlist_stack.go"
+    /* 基于链表实现的栈 */
+    type LinkedListStack struct {
+        // 使用内置包 list 来实现栈
+        data *list.List
+    }
 
+    // NewLinkedListStack 初始化链表
+    func NewLinkedListStack() *LinkedListStack {
+        return &LinkedListStack{
+            data: list.New(),
+        }
+    }
+
+    // Push 入栈
+    func (s *LinkedListStack) Push(value int) {
+        s.data.PushBack(value)
+    }
+
+    // Pop 出栈
+    func (s *LinkedListStack) Pop() any {
+        if s.IsEmpty() {
+            return nil
+        }
+        e := s.data.Back()
+        s.data.Remove(e)
+        return e.Value
+    }
+
+    // Peek 访问栈顶元素
+    func (s *LinkedListStack) Peek() any {
+        if s.IsEmpty() {
+            return nil
+        }
+        e := s.data.Back()
+        return e.Value
+    }
+
+    // Size 获取栈的长度
+    func (s *LinkedListStack) Size() int {
+        return s.data.Len()
+    }
+
+    // IsEmpty 判断栈是否为空
+    func (s *LinkedListStack) IsEmpty() bool {
+        return s.data.Len() == 0
+    }
     ```
 
 === "JavaScript"
@@ -426,7 +493,53 @@ comments: true
 === "Go"
 
     ```go title="array_stack.go"
+    /* 基于数组实现的栈 */
+    type ArrayStack struct {
+        data []int // 数据
+    }
 
+    func NewArrayStack() *ArrayStack {
+        return &ArrayStack{
+            // 设置栈的长度为 0，容量为 16
+            data: make([]int, 0, 16),
+        }
+    }
+
+    // Size 栈的长度
+    func (s *ArrayStack) Size() int {
+        return len(s.data)
+    }
+
+    // IsEmpty 栈是否为空
+    func (s *ArrayStack) IsEmpty() bool {
+        return s.Size() == 0
+    }
+
+    // Push 入栈
+    func (s *ArrayStack) Push(v int) {
+        // 切片会自动扩容
+        s.data = append(s.data, v)
+    }
+
+    // Pop 出栈
+    func (s *ArrayStack) Pop() any {
+        // 弹出栈前，先判断是否为空
+        if s.IsEmpty() {
+            return nil
+        }
+        val := s.Peek()
+        s.data = s.data[:len(s.data)-1]
+        return val
+    }
+
+    // Peek 获取栈顶元素
+    func (s *ArrayStack) Peek() any {
+        if s.IsEmpty() {
+            return nil
+        }
+        val := s.data[len(s.data)-1]
+        return val
+    }
     ```
 
 === "JavaScript"
diff --git a/docs/chapter_tree/binary_search_tree.md b/docs/chapter_tree/binary_search_tree.md
index a1554e9..30d3929 100644
--- a/docs/chapter_tree/binary_search_tree.md
+++ b/docs/chapter_tree/binary_search_tree.md
@@ -88,7 +88,25 @@ comments: true
 === "Go"
 
     ```go title="binary_search_tree.go"
-
+    /* 查找结点 */
+    func (bst *BinarySearchTree) Search(num int) *TreeNode {
+        node := bst.root
+        // 循环查找，越过叶结点后跳出
+        for node != nil {
+            if node.Val < num {
+                // 目标结点在 root 的右子树中
+                node = node.Right
+            } else if node.Val > num {
+                // 目标结点在 root 的左子树中
+                node = node.Left
+            } else {
+                // 找到目标结点，跳出循环
+                break
+            }
+        }
+        // 返回目标结点
+        return node
+    }
     ```
 
 === "JavaScript"
@@ -187,7 +205,36 @@ comments: true
 === "Go"
 
     ```go title="binary_search_tree.go"
-
+    /* 插入结点 */
+    func (bst *BinarySearchTree) Insert(num int) *TreeNode {
+        cur := bst.root
+        // 若树为空，直接提前返回
+        if cur == nil {
+            return nil
+        }
+        // 待插入结点之前的结点位置
+        var prev *TreeNode = nil
+        // 循环查找，越过叶结点后跳出
+        for cur != nil {
+            if cur.Val == num {
+                return nil
+            }
+            prev = cur
+            if cur.Val < num {
+                cur = cur.Right
+            } else {
+                cur = cur.Left
+            }
+        }
+        // 插入结点
+        node := NewTreeNode(num)
+        if prev.Val < num {
+            prev.Right = node
+        } else {
+            prev.Left = node
+        }
+        return cur
+    }
     ```
 
 === "JavaScript"
@@ -365,7 +412,60 @@ comments: true
 === "Go"
 
     ```go title="binary_search_tree.go"
-
+    /* 删除结点 */
+    func (bst *BinarySearchTree) Remove(num int) *TreeNode {
+        cur := bst.root
+        // 若树为空，直接提前返回
+        if cur == nil {
+            return nil
+        }
+        // 待删除结点之前的结点位置
+        var prev *TreeNode = nil
+        // 循环查找，越过叶结点后跳出
+        for cur != nil {
+            if cur.Val == num {
+                break
+            }
+            prev = cur
+            if cur.Val < num {
+                // 待删除结点在右子树中
+                cur = cur.Right
+            } else {
+                // 待删除结点在左子树中
+                cur = cur.Left
+            }
+        }
+        // 若无待删除结点，则直接返回
+        if cur == nil {
+            return nil
+        }
+        // 子结点数为 0 或 1
+        if cur.Left == nil || cur.Right == nil {
+            var child *TreeNode = nil
+            // 取出待删除结点的子结点
+            if cur.Left != nil {
+                child = cur.Left
+            } else {
+                child = cur.Right
+            }
+            // 将子结点替换为待删除结点
+            if prev.Left == cur {
+                prev.Left = child
+            } else {
+                prev.Right = child
+            }
+            // 子结点数为 2
+        } else {
+            // 获取中序遍历中待删除结点 cur 的下一个结点
+            next := bst.GetInorderNext(cur)
+            temp := next.Val
+            // 递归删除结点 next
+            bst.Remove(next.Val)
+            // 将 next 的值复制给 cur
+            cur.Val = temp
+        }
+        return cur
+    }
     ```
 
 === "JavaScript"
diff --git a/docs/chapter_tree/binary_tree.md b/docs/chapter_tree/binary_tree.md
index 2fd44c3..d7c35d9 100644
--- a/docs/chapter_tree/binary_tree.md
+++ b/docs/chapter_tree/binary_tree.md
@@ -44,7 +44,20 @@ comments: true
 === "Go"
 
     ```go title=""
-
+    """ 链表结点类 """
+    type TreeNode struct {
+        Val   int
+        Left  *TreeNode
+        Right *TreeNode
+    }
+    """ 结点初始化方法 """
+    func NewTreeNode(v int) *TreeNode {
+        return &TreeNode{
+            Left:  nil,
+            Right: nil,
+            Val:   v,
+        }
+    }
     ```
 
 === "JavaScript"
@@ -163,7 +176,18 @@ comments: true
 === "Go"
 
     ```go title="binary_tree.go"
-
+    /* 初始化二叉树 */
+    // 初始化结点
+    n1 := NewTreeNode(1)
+    n2 := NewTreeNode(2)
+    n3 := NewTreeNode(3)
+    n4 := NewTreeNode(4)
+    n5 := NewTreeNode(5)
+    // 构建引用指向（即指针）
+    n1.Left = n2
+    n1.Right = n3
+    n2.Left = n4
+    n2.Right = n5
     ```
 
 === "JavaScript"
@@ -228,7 +252,14 @@ comments: true
 === "Go"
 
     ```go title="binary_tree.go"
+    /* 插入与删除结点 */
+    // 在 n1 -> n2 中间插入结点 P
+    p := NewTreeNode(0)
+    n1.Left = p
+    p.Left = n2
 
+    // 删除结点 P
+    n1.Left = n2
     ```
 
 === "JavaScript"
@@ -328,7 +359,29 @@ comments: true
 === "Go"
 
     ```go title="binary_tree_bfs.go"
-
+    /* 层序遍历 */
+    func levelOrder(root *TreeNode) []int {
+        // 初始化队列，加入根结点
+        queue := list.New()
+        queue.PushBack(root)
+        // 初始化一个切片，用于保存遍历序列
+        nums := make([]int, 0)
+        for queue.Len() > 0 {
+            // poll
+            node := queue.Remove(queue.Front()).(*TreeNode)
+            // 保存结点
+            nums = append(nums, node.Val)
+            if node.Left != nil {
+                // 左子结点入队
+                queue.PushBack(node.Left)
+            }
+            if node.Right != nil {
+                // 右子结点入队
+                queue.PushBack(node.Right)
+            }
+        }
+        return nums
+    }
     ```
 
 === "JavaScript"
@@ -446,7 +499,38 @@ comments: true
 === "Go"
 
     ```go title="binary_tree_dfs.go"
+    /* 前序遍历 */
+    func preOrder(node *TreeNode) {
+        if node == nil {
+            return
+        }
+        // 访问优先级：根结点 -> 左子树 -> 右子树
+        nums = append(nums, node.Val)
+        preOrder(node.Left)
+        preOrder(node.Right)
+    }
 
+    /* 中序遍历 */
+    func inOrder(node *TreeNode) {
+        if node == nil {
+            return
+        }
+        // 访问优先级：左子树 -> 根结点 -> 右子树
+        inOrder(node.Left)
+        nums = append(nums, node.Val)
+        inOrder(node.Right)
+    }
+
+    /* 后序遍历 */
+    func postOrder(node *TreeNode) {
+        if node == nil {
+            return
+        }
+        // 访问优先级：左子树 -> 右子树 -> 根结点
+        postOrder(node.Left)
+        postOrder(node.Right)
+        nums = append(nums, node.Val)
+    }
     ```
 
 === "JavaScript"