用循环单链表作为存储结构完成约瑟夫问题的完整代码

下面是用循环单链表实现约瑟夫问题的完整代码，注释中会有详细的说明：

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

class CircularLinkedList:
    def __init__(self):
        self.head = None

    def add_node(self, data):
        new_node = Node(data)
        if not self.head:
            self.head = new_node
            new_node.next = self.head
        else:
            curr = self.head
            while curr.next != self.head:
                curr = curr.next
            curr.next = new_node
            new_node.next = self.head

    def remove_node(self, node):
        if not self.head:
            return
        elif self.head == node:
            curr = self.head
            while curr.next != self.head:
                curr = curr.next
            curr.next = self.head.next
            self.head = self.head.next
        else:
            curr = self.head
            prev = None
            while curr.next != self.head:
                prev = curr
                curr = curr.next
                if curr == node:
                    prev.next = curr.next
                    curr = curr.next

    def get_node(self, index):
        if not self.head:
            return None
        curr = self.head
        i = 0
        while i < index:
            curr = curr.next
            i += 1
        return curr

    def get_size(self):
        if not self.head:
            return 0
        curr = self.head
        size = 0
        while curr.next != self.head:
            size += 1
            curr = curr.next
        return size + 1

def josephus(n, k):
    cll = CircularLinkedList()

    # 添加n个节点
    for i in range(1, n+1):
        cll.add_node(i)

    curr = cll.get_node(0)
    while cll.get_size() > 1:
        # 找到要删除的节点
        for i in range(k-1):
            curr = curr.next
        # 删除节点
        cll.remove_node(curr)
        # 更新curr节点
        curr = curr.next

    return cll.head.data

n = 7
k = 3
winner = josephus(n, k)
print("Winner is:", winner)

其中，`Node`类表示链表中的节点，`CircularLinkedList`类表示循环单链表，`add_node()`方法用于向链表中添加节点，`remove_node()`方法用于删除节点，`get_node()`方法用于获取某个位置的节点，`get_size()`方法用于获取链表的长度。

`josephus()`函数中，首先创建一个循环单链表，然后不断找到要删除的节点，删除它，最后返回剩下的最后一个节点的值，即为胜利者的编号。