摘要：
https://www.luogu.org/problemnew/show/CF1027C include include include include include include include include include include include include include 阅读全文
摘要：
Edward has an array A with N integers. He defines the beauty of an array as the summation of all distinct integers in the array. Now Edward wants to k 阅读全文
摘要：
LCA，最近公共祖先，实现有多种不同的方法，在树上的问题中有着广泛的应用，比如说树上的最短路之类。 LCA的实现方法有很多，比如RMQ、树链剖分等。 今天来讲其中实现较为简单的三种算法： RMQ+时间戳、树上倍增（类似二分步长）、Tarjan算法（DFS+并查集）。 阅读全文
摘要：
【模板】洛谷P3865 include include include include include include include include include include include include include include include include include in 阅读全文