> 题目修改汇总：
> 
> A balls
> 范围  0 <= n < 16 --> 0 <= n <= 16
> all the balls are numbered from 1 to n --> all the balls are numbered from 1 to m
> 在html里面已改过，但在pdf里没有改。 
> 
> D firing range
> output:
>   standing for the number of arcs which weren't covered by fire --> 
>   standing for the number of arcs which were covered by fire k times.
> 之前题目里有对k的描述。
> 

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