摘要：
有一个无限大的矩形，初始时你在左上角（即第一行第一列），每次你都可以选择一个右下方格子，并瞬移过去（如从下图中的红色格子能直接瞬移到蓝色格子），求到第nn行第mm列的格子有几种方案，答案对10000000071000000007取模。 Input多组测试数据。 两个整数n,m(2≤n,m≤10000 阅读全文
摘要：
In your childhood, do you crazy for collecting the beautiful cards in the snacks? They said that, for example, if you collect all the 108 people in th 阅读全文
摘要：
Given a number N, you are asked to count the number of integers between A and B inclusive which are relatively prime to N. Two integers are said to be 阅读全文
摘要：
LazyChild is a lazy child who likes candy very much. Despite being very young, he has two large candy boxes, each contains n candies initially. Everyd 阅读全文