8.30前端jQuery和数据结构知识

2018-8-30 16:37:17

单链表的demo

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#    coding:utf-8        2018-8-30 16:36:30

class Node(object):
    """节点"""
    def __init__(self, elem):
        self.elem = elem
        self.next = None

# node = Node(100)

class SingleLinkList(object):
    """单链表"""
    def __init__(self, node=None):
        self.__head  = node

    def is_empty(self):
        """判断链表为空"""
        return self.__head == None

    def length(self):
        """链表长度"""
        # cur游标,用来移动遍历节点
        cur = self.__head
        # count记录数量
        count = 0
        while cur !=None :
            count += 1
            cur = cur.next
        return count

    def travel(self):
        """遍历整个链表"""
        cur = self.__head
        while cur != None:
            print(cur.elem)
            cur = cur.next

    def add(self, item):
        """链表头部添加元素"""
        pass

    def append(self, item):
        """链表尾部添加元素"""
        node = Node(item)
        if self.is_empty():
            self.__head = node
        else:
            cur = self.__head
            while cur.next != None:
                cur = cur.next
            # 添加节点
            cur.next = node

    def insert(self, pos, item):
        """指定位置添加元素"""
        pass

    def remove(self,item):
        """删除节点"""
        pass

    def search(self, item):
        """查找节点是否存在"""
        pass

if __name__ == '__main__':
    ll = SingleLinkList()
    print(ll.is_empty())
    print(ll.length())

    ll.append(1)
    print(ll.is_empty())
    print(ll.length())

    ll.append(2)
    ll.append(3)
    ll.append(4)
    ll.append(5)
    ll.append(6)
    ll.travel()