摘要： You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you cl 阅读全文

摘要： Throughout all this conversation, my eyes flickered again and again to the table where the strange family sat. 从对话的自始自终我的眼睛都一遍又一遍的闪烁在那个奇怪家庭的位置上。 They 阅读全文