摘要：
1.题目It is vitally important to have all the cities connected by highways in a war. If a city is occupied b... 阅读全文
摘要：
1.题目Given a pair of positive integers, for example, 6 and 110, can this equation 6 = 110 be true? The answ... 阅读全文
摘要：
1.题目A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members ... 阅读全文