Secondly, how to decide the structure of a graph to minimum broadcasting time?
极小广播图问题，即如何确定图的结构使得广播时间最短。
It also has broadcasting centers at Time Warner center in New York City.
它在在纽约时代华纳中心也有广播中心。
Until one day to hear the broadcasting station "the sweetheart time".
直到有一天听到电台“甜心时间”。
Until one day to hear the broadcasting station "the sweetheart time".
直到有一天听到电台“甜心时间”。
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