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好好审题，你看看前半句话

Posted by KeyID at 2014-10-03 23:47:13 on Problem 3259
In Reply To:必须回到1点，应该是NO。 Posted by:justryit at 2013-07-31 08:45:37 
> “return to the starting field a time before his initial departure.”

start at some field, travel through some paths and wormholes, and return to the starting field a time before his initial departure

"start at some field"显然开始点不一定是1
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