迷宫算法，火烧连营”是三国演义中的著名典故之一广为流传，假定文本文件c1.txt是火烧连营中的军营分布图，每个字符A代表一个营帐，营帐是可燃物，其他字符代表不可燃的空白地段，文件共有40行70列。(Labyrinth algorithm,One of the famous allusions in the romance of the Three Kingdoms is widely spread. It is assumed that the text document c1.txt is a distribution map of the barracks in the burning company. Each character A represents a barracks, the barracks are combustible, the other characters represent the non flammable blank section, and there are 40 lines and 70 columns in the file.)