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Given a sequence of K integers { N 1, N 2, ..., N K }. A continuous subsequence is defined to be { N i , N i +1, ..., N j } where 1≤ i ≤ j ≤ K . The M 阅读全文
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1004 Counting Leaves (30分) A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. In 阅读全文
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As an emergency rescue team leader of a city, you are given a special map of your country. The map shows several scattered cities connected by some ro 阅读全文