摘要： Description A fractal is an object or quantity that displays self-similarity, in a somewhat technical sense, on all scales. The object need not exhibi 阅读全文

摘要： In mathematics, a subsequence is a sequence that can be derived from another sequence by deleting some elements without changing the order of the rema 阅读全文

摘要： There is going to be a party to celebrate the 80-th Anniversary of the Ural State University. The University has a hierarchical structure of employees 阅读全文

摘要： Vasya has n days of vacations! So he decided to improve his IT skills and do sport. Vasya knows the following information about each of this n days: w 阅读全文

摘要： For a number,if the length of continuous odd digits is even and the length of continuous even digits is odd,we call it odd-even number.Now we want to 阅读全文