2015年4月20日
Climbing Stairs
摘要： You are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb... 阅读全文
posted @ 2015-04-20 21:07 amazingzoe 阅读(135) 评论(0) 推荐(0)