Red/Blue Spanning Tree Time Limit: 2000ms Memory Limit: 131072KB This problem will be judged on HDU. Original ID: 426364-bit integer IO format: %I64d      Java class name: Main   Given an undirected, unweighted, connected graph, where each edge is co…

CF1208H Red Blue Tree 原本应该放在这里但是这题过于毒瘤..单独开了篇blog 首先考虑如果 $ k $ 无限小,那么显然整个树都是蓝色的.随着 $ k $ 逐渐增大,每个点都会有且仅有一次变色,我们考虑维护这个变色的时间 $ t $ .如果每个点的变色时间都已经被算出来,那么我们可以轻易解决题目的查询操作和修改 $ k $ , 也就是说修改 $ k $ 本身就是个假操作..只需要考虑的是修改单点颜色. 修改单点颜色,看起来就很 $ ddp $ .树链剖分后,用$ f(x)…

Problem Description XXX is very interested in algorithm. After learning the Prim algorithm and Kruskal algorithm of minimum spanning tree, XXX finds that there might be multiple solutions. Given an undirected weighted graph with n (1<=n<=100) vertex…

给定一个无向图,如果他的某个子图中,任意两个顶点都能互相连通并且是一棵树,那么这棵树就叫做生成树(spanning tree). 如果边上有权值,那么使得边权和最小的生成树叫做最小生成树(MST,Minimum Spanning Tree).       1.prim版本的算法   .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", co…

E. Minimum spanning tree for each edge   Connected undirected weighted graph without self-loops and multiple edges is given. Graph contains n vertices and m edges. For each edge (u, v) find the minimal possible weight of the spanning tree that contai…

time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Connected undirected weighted graph without self-loops and multiple edges is given. Graph contains n vertices and m edges. For each edge (u,…

E. Minimum spanning tree for each edge time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Connected undirected weighted graph without self-loops and multiple edges is given. Graph contains n …

E. Minimum spanning tree for each edge 题目连接: http://www.codeforces.com/contest/609/problem/E Description Connected undirected weighted graph without self-loops and multiple edges is given. Graph contains n vertices and m edges. For each edge (u, v) f…

You may refer to the main idea of MST in graph theory. http://en.wikipedia.org/wiki/Minimum_spanning_tree Here is my own interpretation What is Minimum Spanning Tree? Given a connected and undirected graph, a spanning tree of that graph is a subgraph…

Minimum Spanning Tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) [Problem Description] XXX is very interested in algorithm. After learning the Prim algorithm and Kruskal algorithm of minimum spanning tree, XXX…