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我真是太白痴了

Posted by 1000012871 at 2011-12-07 16:06:00 on Problem 2502
我竟然如此自然的以为 只要在一条subway上的两个站的距离等于原始距离处以40km就可以了。。。。。。 subway又不一定是直的!!!!我真是太白痴了!!!

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