摘要：
链接：https://ac.nowcoder.com/acm/contest/9977/B 来源：牛客网 题目描述 牛牛有一个长和高都为为nn的网格三角形，牛牛想从从左下角点走到右上角点，但是牛牛只能向上或者向右沿着网格的边走，牛牛想知道从左下角点走到右上角点的方案数的奇偶性。牛牛现在给你nn，请你 阅读全文
摘要：
In computer science, a binary tree is a rooted tree in which each node has at most two children. In this problem, let's denote 𝑛n as the number of no 阅读全文
摘要：
Pang believes that one cannot make an omelet without breaking eggs. For a subset 𝐴A of {1,2,…,𝑛}{1,2,…,n}, we calculate the score of 𝐴A as follows: 阅读全文