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题目: 给你字符串 s 和整数 k 。 请返回字符串 s 中长度为 k 的单个子字符串中可能包含的最大元音字母数。 英文中的 元音字母 为(a, e, i, o, u)。 示例 1: 输入:s = "abciiidef", k = 3输出:3解释:子字符串 "iii" 包含 3 个元音字母。示例 2 阅读全文
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题目: Given a sequence of positive integers and another positive integer p. The sequence is said to be a perfect sequence if M≤m×p where M and m are the 阅读全文
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题目: There is a public bike service in Hangzhou City which provides great convenience to the tourists from all over the world. One may rent a bike at a 阅读全文
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题目: 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 som 阅读全文
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题目: This is a problem given in the Graduate Entrance Exam in 2018: Which of the following is NOT a topological order obtained from the given directed 阅读全文