Codeforces 600E - Lomsat gelral(树上启发式合并) 600E - Lomsat gelral 题意 给出一颗以 1 为根的树,每个点有颜色,如果某个子树上某个颜色出现的次数最多,则认为它在这课子树有支配地位,一颗子树上,可能有多个有支配的地位的颜色,对每颗子树分别求有支配地位的颜色的和(把颜色这个权值相加)。 分析 树上...
https://codeforces.com/contest/600/problem/E [算法] 对于每一个点建立一棵线段树 , 维护当前点的子树中每个点的出现次数 可以通过深度优先遍历从下到上进行线段树合并 时间复杂度 : O(NlogN) [代码] #include<bits/stdc++.h>usingnamespacestd;#defineMAXN 100010#defineMAXP 5000005typedeflonglongll; type...
codeforces-600E - Lomsat gelral(树上启发式合并) 链接: http://codeforces.com/problemset/problem/600/E 题意: You are given a rooted tree with root in vertex 1. Each vertex is coloured in some colour. Let's call colour c dominating in the subtree of vertex v if there are no other col...
http://codeforces.com/problemset/problem/600/E 树上启发式合并就是暴力 但是利用dfs序的特点 把最大子树放在最后 递归返回时可以省去更新该子树 因为一个点到祖先的路径中 轻边的数量是logn左右的 所以一个点最多被更新logn次 从而把时间降到nlogn #include <bits/stdc++.h> usingnamespacestd;...
E. Lomsat gelral time limit per test2 seconds memory limit per test256 megabytes You are given a rooted tree with root in vertex 1. Each vertex is coloured in some colour. Let's call colour c dominating in the subtree of vertex v if there are no other colours that appear in the ...
CodeForces - 600E Lomsat gelral 目录 Description 线段树合并 DescriptionDescription 传送门 SolutionSolution dsu on treedsu on tree 好妙啊。 显然统计了uu为根子树后要清空才能统计它的兄弟,我们尝试加一些小小的优化。 预处理出轻重儿子,由于如果一个儿子是最后遍历的就不用清空,直观地我们选择重儿子最后遍历。
E. Lomsat gelral You are given a rooted tree with root in vertex 1. Each vertex is coloured in some colour. Let's call colour c dominating in the subtree of vertex v if there are no other colours that appear in the subtree of vertex v more times than colour c. So it's possible ...
codeforces 600E E. Lomsat gelral (线段树合并) codeforces 600E E. Lomsat gelral 题意: 给你一颗n个节点的树,树上的每一个节点都有一种颜色,询问每一个节点所在的子树颜色数量最多的那些颜色的值的总和 题解: 维护子树颜色的数量和答案,线段树合并即可...
Lomsat gelral CodeForces - 600E (树上启发式合并) You are given a rooted tree with root in vertex 1. Each vertex is coloured in some colour. Let's call colour c dominating in the subtree of vertex v if there are no other colours that appear in the subtree of vertex v more times ...
codeforces-600E - Lomsat gelral(树上启发式合并) 链接: http://codeforces.com/problemset/problem/600/E 题意: You are given a rooted tree with root in vertex 1. Each vertex is coloured in some colour. Let's call colour c dominating in the subtree of vertex v if there are no other ...