if not self.verify_node(node): continue if n_id in closed_set: continue if n_id not in open_set: open_set[n_id] = node else: if open_set[n_id].cost > node.cost: open_set[n_id] = node
时间: 2023-12-25 15:03:57 浏览: 22
这是 A* 算法中的核心代码,实现了对下一个可能路径的判断和选择。具体来说,它首先验证节点是否合法,如果不合法则跳过。接着判断下一个节点是否已经在闭集合中,如果是,则跳过。然后判断下一个节点是否已经在开集合中,如果不是,则将其加入开集合;如果是,则比较下一个节点经过当前路径的代价与之前路径的代价,选择代价更小的路径。这个代码段可以帮助你理解 A* 算法中如何搜索最优路径。
相关问题
根据下面的代码请帮我定义一个msg_logs,class PB_FT(): def __init__(self,last_sequence_id,msg_logs,view_id): self.last_sequence_id = last_sequence_id self.msg_logs = msg_logs # self.request = request self.view_id = view_id def start_consensus(self,request): sequence_id = int(time.time() * 1000000000) if self.last_sequence_id != -1: while self.last_sequence_id >= sequence_id: sequence_id += 1 request.sequence_id = sequence_id self.msg_logs.req_msg = request digest, err = self.digests(request) if err != 0: print(err) return None,err self.current_stage = "PrePrepared" return PrePrepareMsg(self.view_id,sequence_id,digest,request) def pre_prepare(self,pre_prepare_msg): self.msg_logs.req_msg = pre_prepare_msg.request_msg if not self.verify_msg(self,pre_prepare_msg.view_id,pre_prepare_msg.sequence_id,pre_prepare_msg.digest): return None,errors("pre-prepare messages is corrupted") self.current_stage = "PrePrepared" return VoteMsg(self,self.view_id,pre_prepare_msg.sequence_id,pre_prepare_msg.digest,"PrepareMsg")
可以将msg_logs定义为一个字典,其中每个key表示一条消息的唯一标识id,每个value是一个列表,包含发送方、接收方、消息内容、时间戳等信息。具体定义如下:
msg_logs = {
1: ["sender1", "receiver1", "message1", "timestamp1"],
2: ["sender2", "receiver2", "message2", "timestamp2"],
...
}
在PB_FT类的初始化函数中,将msg_logs作为一个参数传入,并保存在对象属性中。在start_consensus方法中,可以使用msg_logs记录请求消息和生成唯一标识id。在pre_prepare方法中,可以使用msg_logs记录预准备消息和验证消息的完整性。
Could not find artifact com.atguigu:maven_java:pom:1.0 in nexus-aliyun
As an AI language model, I cannot access or check the contents of the nexus-aliyun repository. However, the error message suggests that the artifact "com.atguigu:maven_java:pom:1.0" is not available in the specified repository.
Here are some possible reasons for this issue:
1. The artifact was never published or uploaded to the repository.
2. The artifact was deleted or removed from the repository.
3. There is a typo or error in the artifact coordinates.
4. The repository is not configured correctly or is inaccessible.
To resolve this issue, you can try the following steps:
1. Double-check the artifact coordinates to ensure they are correct.
2. Check if the artifact exists in a different repository or source.
3. Verify that the repository is configured correctly and accessible.
4. If the artifact is missing, try contacting the publisher or repository admin to request its availability.
If none of these solutions work, you may need to provide more context or details about the issue to get further help.