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1034 Head of a Gang One way that the police finds the head of a gang is to check people's phone calls. If there is a phone call between A and B, we sa 阅读全文
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1013 Battle Over Cities It is vitally important to have all the cities connected by highways in a war. If a city is occupied by the enemy, all the hig 阅读全文
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1021 Deepest Root A graph which is connected and acyclic can be considered a tree. The height of the tree depends on the selected root. Now you are su 阅读全文
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1022 Digital Library A Digital Library contains millions of books, stored according to their titles, authors, key words of their abstracts, publishers 阅读全文
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1071 Speech Patterns People often have a preference among synonyms of the same word. For example, some may prefer "the police", while others may prefe 阅读全文
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1100 Mars Numbers People on Mars count their numbers with base 13: Zero on Earth is called “tret” on Mars. The numbers 1 to 12 on Earch is called “jan 阅读全文
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1060 Are They Equal If a machine can save only 3 significant digits, the float numbers 12300 and 12358.9 are considered equal since they are both save 阅读全文
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1063 Set Similarity Given two sets of integers, the similarity of the sets is defined to be Nc/Nt*100%, where Nc is the number of distinct common numb 阅读全文