经典问题.强制在线的话非常复杂. 考虑离线. 每条边的存在时间是一个区间,因此按时间建立一颗线段树,将每条边插入,拆成log条边.然后dfs线段树,每次并查集合并当前节点的所有边,到叶子节点时回答询问,回溯时撤销并查集的修改. 带撤销的并查集不能路径压缩,要按秩合并. #include<bits/stdc++.h> #define N 200005 #define M (l+r>>1) #define P (k<<1) #define S (k<<1|1)…
1 introduction Assembler is a DSL of Jena to specify something to build, models and dataset, for example. 2 examples Jena Assembler's syntax seems like turtle, here is commonly used prefixes: @prefix tdb: <http://jena.hpl.hp.com/2008/tdb#> . @prefix…