並前往http://web.ici-biot.com/ap/test2/StraightStaircase/2.TwoStraightStairs/%E8%A8%AD%E7%BD%AE%E5%85%A9%E5%BA%A7%E7%9B%B4%E9%80%9A%E6%A8%93%E6%A2%AF%E4%B9%8B%E9%99%90%E5%88%B6.html