摘要：
http://acm.csu.edu.cn:20080/csuoj/problemset/problem?pid=2281 Description An arithmetic progression is a sequence of numbers a1, a2, ..., ak where the 阅读全文
摘要：
JAVAMAN is visiting Dream City and he sees a yard of gold coin trees. There are n trees in the yard. Let's call them tree 1, tree 2 ...and tree n. At 阅读全文