2013年11月12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 @ 2013-11-12 14:24 Step-BY-Step 阅读(133) 评论(0) 推荐(0) 编辑

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