问题标题：
【ThereareNsteps.urattheNo.Ystep.HowmanywayswoulditbeifuwalkKsteps?onesteponce.ThereareNsteps.urattheNo.Ystep.HowmanywayswoulditbeifuwalkKsteps?onesteponetime.Who'ssmartenoughtohelpmesolvethisproblem?Help】
问题描述：
ThereareNsteps.urattheNo.Ystep.HowmanywayswoulditbeifuwalkKsteps?onesteponce.
ThereareNsteps.urattheNo.Ystep.HowmanywayswoulditbeifuwalkKsteps?onesteponetime.Who'ssmartenoughtohelpmesolvethisproblem?Helpplease.
刘克显回答：
Itwouldbetwoways---upstairsordownstairs.
两种情况：上楼、下楼.
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