题目内容
含有n个顶点的连通无向图，其边的个数至多为（）。
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含有n个顶点的连通有向图，其边的个数至多为（）。
下列哪种算法是求单源点最短路径的算法（）
Espionage in Modern SocietyThe end of the Cold War has not brought about world peace. In an era when the country's first line of___1____, intelligence is more important than ever. Spies and new technologies will again play an important role in ____2_______the final victors.Beginning in World War II and continuing through the Cold War, the world's __3____intelligence agencies (the CIA, KGB's First Chief Directorate, MI6, etc.) employed the latest technologies available in "____4_____ ", communication and analysis of information from abroad.At the same time, counterintelligence agencies (the FBI, KGB's Second Chief Directorate, MI5, etc.) employed other technologies in ___5___to identify and eliminate foreign spies at home.New technologies are changing the _____6______methods and techniques (called "tradecraft") by which spies operate. And the traditional tradecraft of spies are applied in new ways. For example, computer viruses have been developed and deployed that will be ____7_____in time of war.The advent of the "Keyhole" satellite program nearly 30 years ago provided the United States with the capability to digitally ___8_____events on Earth in near "real time". Exponential advances in computer processing power have subsequently provided refinements that ___9___these "spies in the sky" to observe the Earth regardless of cloud cover, inclement weather and darkness. Using infrared___10____, radar and advanced sensing lenses, they can resolve images approaching a single inch in diameter. The strategic role of ____11_____will be tactically supplemented by small pilotless drone aircraft, with stealth masking, capable of remaining aloft for days at a time over hostile territory.The traditional roles of "friends and foes" continue to blur. Purchasing secrets from traitors remains an effective and ____12_____mainstay of intelligence collection. A few million dollars invested in an intelligence program to recruit spies with access to important secrets may ___13___in economic payoffs worth billions of dollars. Thus, It is an acknowledged rule in U.S. espionage work that your enemy’s friend can also be your friend.Thus, counterintelligence is of __14___importance. Counterspies will be forced to adapt and accelerate the use of digital tools in an effort to catch foreign spies. Hostile services will resort to powerful neural networks and massive databases to _____15_____information about individuals to identify and apprehend foreign spies.
人员配备是现代组织进行人才建设的基础，关系到组织的长远发展。
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