迴圈連結串列就是將單鏈表的末尾指向其頭部，形成一個環。迴圈連結串列的增刪操作和單鏈表的增刪操作
區別不大。只是增加時，需要考慮空連結串列增加第一個節點的特殊情況；刪除時需考慮刪除節點是頭/尾節點，和連結串列中只有一個節點的特殊情況。

golang實現：

type Node struct {
 value int
 next *Node
}

type Circle struct {
 tail *Node
 lenth int
}

// 增加節點：
func (c *Circle) add(value int) {
 newNode := &Node{value,nil}
 if c.lenth == 0 { //空連結串列中新增節點
 c.tail = newNode
 c.tail.next = newNode
 } else {
 newNode.next = c.tail.next
 c.tail.next = newNode
 c.tail = newNode
 }
 c.lenth += 1
 c.printCircle()
}

// 刪除節點：
func (c *Circle) remove(v int) {
 if c.lenth == 0 {
 fmt.Println("空環")
 return
 } else if c.lenth == 1 && c.tail.value == v { //連結串列中只有一個節點的特殊情況
 c.tail = nil
 c.lenth = 0
 c.printCircle()
 return
 }
 pre := c.tail
 cur := c.tail.next // 頭節點
 for i := 0; i < c.lenth; i++ {
 if cur.value == v {
  if cur == c.tail { //如果刪除的節點是尾節點,需更新tail
  c.tail = pre
  }
  pre.next = cur.next
  c.lenth -= 1
  c.printCircle()
  return
 }
 pre = cur
 cur = cur.next
 }
 fmt.Println(v,"不在環中")
}

//列印節點：
func (c *Circle) printCircle() {
 if c.lenth == 0 {
 fmt.Println("空環")
 return
 }
 cur := c.tail.next // 頭節點
 for i := 0; i < c.lenth; i++ {
 fmt.Printf("%d ",cur.value)
 cur = cur.next
 }
 fmt.Println()
}

func testCircle() {
 var circle *Circle = new(Circle)
 //for i := 1; i <=41; i++ {
 // circle.add(i)
 //}
 circle.add(1)
 circle.remove(10)
 circle.printCircle()
}

python實現：

class Node:
 def __init__(self,value,next=None):
 self.value = value
 self.next = next

 def __str__(self):
 return str(self.value)

class Circle:
 def __init__(self):
 self.tail = None
 self.lenth = 0

 # 增加節點
 def add(self,v):
 new_node = Node(v)
 if self.lenth == 0: # 空連結串列中新增節點
  self.tail = new_node
  self.tail.next = new_node
 else:
  new_node.next = self.tail.next
  self.tail.next = new_node
  self.tail = new_node
 self.lenth += 1

 # 刪除節點
 def remove(self,v):
 if self.lenth == 0:
  print("空環")
  return
 elif self.lenth == 1 and self.tail.value == v: # 連結串列中只有一個節點的特殊情況
  self.tail = None
  self.lenth = 0
  return
 pre = self.tail
 cur = self.tail.next # 頭節點
 for i in range(self.lenth):
  if cur.value == v:
  if cur == self.tail: # 如果刪除的節點是尾節點，需更新tail
   self.tail = pre
  pre.next = cur.next
  self.lenth -= 1
  return
  pre = cur
  cur = cur.next
 print(v,"不在環中")

 # 列印連結串列
 def print_circle(self):
 if self.lenth == 0:
  print('空環')
  return
 cur = self.tail.next # 頭節點
 for i in range(self.lenth):
  print(cur,end=" ")
  cur = cur.next
 print()


def test():
 c = Circle()
 for i in range(10):
 c.add(i)
 c.print_circle()
 c.remove(0)
 c.print_circle()
 c.remove(10)
 c.print_circle()
 c.remove(9)
 c.print_circle()
 c.remove(4)
 c.print_circle()

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