计算链表中的单词数

class ListNode:
    def __init__(self, val=''):
        self.val = val
        self.next = None


def count_words(head):
    count = 0
    current = head

    while current:
        words = current.val.split()
        count += len(words)
        current = current.next

    return count

# 创建链表
node1 = ListNode("Hello world")
node2 = ListNode("This is a sentence.")
node3 = ListNode("Singleword")
node4 = ListNode("Bye")
node1.next = node2
node2.next = node3
node3.next = node4

# 计算单词数
word_count = count_words(node1)
print("单词数:", word_count)

单词数: 7