Add Go codes to docs, including

the chapter of stack and queue, the chapter of tree.

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