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You are standing on the middle of a East-West street. A row of closed doors in front of you, and you have a key on hand which can only open one specific door. Compose a strategy so that X/N value is smallest under the worst situation. X is the distance you covered when arriving at the correct door. N is the distance between the door and the original point.

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    Compose a strategy for _what_?2012-01-29

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