belief set + new belief
if conflict-------> find reason why ------> remove the reason ------> add new belief
if conflict -------> find reason 1 or reason 2------> remove reason 1 or reason 2----->add new belief.
The final exam: online.
1. textbook about search algorithm
2. exercises
3. pdf
no questions about the assignments.
原文：https://www.cnblogs.com/dulun/p/12698535.html