摘要：Iahub and Sorin are the best competitive programmers in their town. However, they can't both qualify to an important contest. The selection will be ma 阅读全文

摘要：A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A f(n 1) + B f(n 2)) mod 7. Given A, B, and n, you are to calculate the value of 阅读全文

摘要：Have you ever played quoit in a playground? Quoit is a game in which flat rings are pitched at some toys, with all the toys encircled awarded. In the 阅读全文