上次被資管同學考倒= =，完全看不懂這啥問題
不知道是不是分析這一類的問題，我怕我問錯!
The accompanying sketch represents a maze of one-way streets in a city in the
United States. The traffic volume through certain blocks during an hour has
been measured. Suppose that the vehicles leaving the area during this hour
were exactly the same as those entering it.
http://www.badongo.com/cn/pic/7344593
What can you say about the traffic volume at the four locations indicated by
a question mark? Can you figure out exactly how much traffic there was on
each block? If not, describe one possible scenario. For each of the four
locations, find the highest and the lowest possible traffic volume
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