状态空间法野人与修道士Python

好的，您的问题是关于状态空间法和野人与修道士问题的Python实现。那么，我可以给您提供一份基于Python的状态空间法野人与修道士问题的代码示例，供您参考。

代码如下：

# 定义问题状态类
class State:
    def __init__(self, left, right, boat):
        # 左岸修道士人数
        self.left_missionaries = left[0]
        # 左岸野人人数
        self.left_cannibals = left[1]
        # 右岸修道士人数
        self.right_missionaries = right[0]
        # 右岸野人人数
        self.right_cannibals = right[1]
        # 船是否在左岸
        self.boat_on_left = boat

    # 判断当前状态是否合法
    def is_valid(self):
        if self.left_missionaries < 0 or self.left_cannibals < 0 or self.right_missionaries < 0 or self.right_cannibals < 0:
            return False
        if self.left_missionaries > 3 or self.left_cannibals > 3 or self.right_missionaries > 3 or self.right_cannibals > 3:
            return False
        if self.left_cannibals > self.left_missionaries > 0 or self.right_cannibals > self.right_missionaries > 0:
            return False
        return True

    # 判断当前状态是否为目标状态
    def is_goal(self):
        return self.left_missionaries == 0 and self.left_cannibals == 0

    # 判断两个状态是否相等
    def __eq__(self, other):
        return self.left_missionaries == other.left_missionaries \
               and self.left_cannibals == other.left_cannibals \
               and self.right_missionaries == other.right_missionaries \
               and self.right_cannibals == other.right_cannibals \
               and self.boat_on_left == other.boat_on_left

    # 获取状态的哈希值
    def __hash__(self):
        return hash((self.left_missionaries, self.left_cannibals, self.right_missionaries, self.right_cannibals, self.boat_on_left))

    # 获取可供选择的下一步状态
    def get_next_states(self):
        next_states = set()
        if self.boat_on_left:
            for i in range(3):
                for j in range(3):
                    if i + j > 0 and i + j <= 2:
                        next_state = State((self.left_missionaries - i, self.left_cannibals - j), (self.right_missionaries + i, self.right_cannibals + j), False)
                        if next_state.is_valid():
                            next_states.add(next_state)
        else:
            for i in range(3):
                for j in range(3):
                    if i + j > 0 and i + j <= 2:
                        next_state = State((self.left_missionaries + i, self.left_cannibals + j), (self.right_missionaries - i, self.right_cannibals - j), True)
                        if next_state.is_valid():
                            next_states.add(next_state)
        return next_states

# 定义状态空间搜索类
class StateSpaceSearch:
    def __init__(self, init_state, goal_state):
        self.init_state = init_state
        self.goal_state = goal_state

    # 进行状态空间搜索
    def search(self):
        visited = set()
        frontier = [(self.init_state, [])]

        while frontier:
            state, path = frontier.pop(0)

            if state.is_goal():
                return path

            visited.add(state)

            for next_state in state.get_next_states():
                if next_state not in visited:
                    frontier.append((next_state, path + [(state, next_state)]))

        return None

# 定义初始状态和目标状态
init_state = State((3, 3), (0, 0), True)
goal_state = State((0, 0), (3, 3), False)

# 进行状态空间搜索
search = StateSpaceSearch(init_state, goal_state)
path = search.search()

# 输出路径
print("The path from the initial state to the goal state is:")
for i, (state, next_state) in enumerate(path):
    print("Step", i + 1, ": Take", abs(state.left_missionaries - next_state.left_missionaries), "missionaries and", abs(state.left_cannibals - next_state.left_cannibals), "cannibals from", "left" if state.boat_on_left else "right", "to", "right" if next_state.boat_on_left else "left")

以上代码实现了状态空间法野人与修道士问题的Python实现。您可以根据自己的需求进行修改和优化。