摘要：
Some DNA sequences exist in circular forms as inthe following gure, which shows a circular sequence\CGAGTCAGCT", that is, the last sym... 阅读全文
摘要：
For a positive integer N , the digit-sum of N is defined as the sum of N itself and its digits. When M is the digitsum of N , we call ... 阅读全文
摘要：
MasterMind is a game for two players. One of them, Designer, selects a secret code. The other, Breaker, tries to break it. A code is n... 阅读全文