老鼠探索路径（Python语言）

    matrix = []  # 定义二维数组
    exit_x = 1  # 定义出口所在行
    exit_y = 1  # 定义出口所在列
    
    
    class Node:
    def __init__(self, x, y):
        self.x = x
        self.y = y
        self.next = None
    
    
    class TraceRecord:
    def __init__(self):
        self.first = None
        self.last = None
    
    def is_empty(self):
        return self.first is None
    
    def insert(self, x, y):  # 入栈
        new_node = Node(x, y)
        if self.first is None:
            self.first = new_node
            self.last = new_node