摘要：
P1972 [SDOI2009]HH的项链 题目背景 无 无 题目描述 HH 有一串由各种漂亮的贝壳组成的项链。HH 相信不同的贝壳会带来好运，所以每次散步完后，他都会随意取出一段贝壳，思考它们所表达的含义。HH 不断地收集新的贝壳，因此，他的项链变得越来越长。有一天，他突然提出了一个问题：某一段贝 阅读全文
摘要：
query Given a permutation pp of length nn, you are asked to answer mm queries, each query can be represented as a pair (l ,r )(l,r), you need to find 阅读全文
摘要：
XKC's basketball team XKC , the captain of the basketball team , is directing a train of nn team members. He makes all members stand in a row , and nu 阅读全文
摘要：
A.Laptop 链接：https://ac.nowcoder.com/acm/contest/16/A来源：牛客网 时间限制：C/C++ 1秒，其他语言2秒 空间限制：C/C++ 131072K，其他语言262144K 64bit IO Format: %lld 时间限制：C/C++ 1秒，其他语 阅读全文
摘要：
P3806 【模板】点分治1 题目背景 感谢hzwer的点分治互测。 感谢hzwer的点分治互测。 题目描述 给定一棵有n个点的树 询问树上距离为k的点对是否存在。 给定一棵有n个点的树 询问树上距离为k的点对是否存在。 输入格式 n,m 接下来n-1条边a,b,c描述a到b有一条长度为c的路径 接 阅读全文
摘要：
Travel There are nn planets in the MOT galaxy, and each planet has a unique number from 1 \sim n1∼n. Each planet is connected to other planets through 阅读全文
摘要：
Swap There is a sequence of numbers of length nn, and each number in the sequence is different. There are two operations: Swap the first half and the 阅读全文
摘要：
Tree Ming and Hong are playing a simple game called nim game. They have nn piles of stones numbered 11 to nn ,the ii-th pile of stones has a_iai ston 阅读全文
摘要：
Angel's Journey “Miyane!” This day Hana asks Miyako for help again. Hana plays the part of angel on the stage show of the cultural festival, and she i 阅读全文
摘要：
Tasks It's too late now, but you still have too much work to do. There are nn tasks on your list. The ii-th task costs you t_itiseconds. You want to 阅读全文