Description The cows have once again tried to form a startup company, failing to remember from past experience that cows make terrible managers!The cows, conveniently numbered 1…N1…N (1≤N≤100,000), organize the company as a tree, with cow 1 as the pr…

原文地址:http://www.cnblogs.com/GXZlegend/p/6832263.html 题目描述 The cows have once again tried to form a startup company, failing to remember from past experience that cows make terrible managers!The cows, conveniently numbered 1…N1…N (1≤N≤100,000), organi…

4756: [Usaco2017 Jan]Promotion Counting Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 305  Solved: 217[Submit][Status][Discuss] Description The cows have once again tried to form a startup company, failing to remember from past experience t hat cow…

[题目链接] http://www.lydsy.com/JudgeOnline/problem.php?id=4756 [题目大意] 给出一棵树,对于每个节点,求其子树中比父节点大的点个数 [题解] 我们考虑每个权值建立一棵线段树,边dfs边将子节点合并为一颗线段树, 那么只要查询当前点的树上后缀和即可. [代码] #include <cstdio> #include <algorithm> #include <cstring> #include <vector&…

题面:P3605 [USACO17JAN]Promotion Counting晋升者计数 题解:这是一道万能题,树状数组 || 主席树 || 线段树合并 || 莫队套分块 || 线段树 都可以写..记得离散化 线段树合并版: #include<cstdio> #include<cstring> #include<iostream> #include<algorithm> using namespace std; ; ,edge_head[maxn],W[ma…

[题意]带点权树,统计每个结点子树内点权比它大的结点数. [算法]线段树合并 [题解]对每个点建权值线段树(动态开点),DFS中将自身和儿子线段树合并后统计. 注意三个量tot,cnt,tots,细心查错. #include<cstdio> #include<algorithm> #include<cstring> using namespace std; ; int n,first[maxn],cnt,tot,tots,root[maxn],a[maxn],b[max…

思路还是挺好玩的 首先简单粗暴的想法是dfs然后用离散化权值树状数组维护,但是这样有个问题就是这个全局的权值树状数组里并不一定都是当前点子树里的 第一反应是改树状数组,但是显然不太现实,但是可以这样想,就是现在统计子树之前把查到的答案减去,然后再查子树最后加上查到的答案,这样相当于去重了 方便起见,离散化的时候按从大到小的顺序,这样就变成了求比当前点小的点 #include<iostream> #include<cstdio> #include<algorithm> #…

题目:https://www.lydsy.com/JudgeOnline/problem.php?id=4756 线段树合并裸题.那种返回 int 的与传引用的 merge 都能过.不知别的题是不是这样. #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> using namespace std; ,M=N**; int n,m,a[N],tp[N],rt[N],…

调半天原来是dsu写不熟 Description The cows have once again tried to form a startup company, failing to remember from past experience t hat cows make terrible managers!The cows, conveniently numbered 1…N1…N (1≤N≤100,000), organize t he company as a tree, with…

题目描述 The cows have once again tried to form a startup company, failing to remember from past experience t hat cows make terrible managers!The cows, conveniently numbered 1…N1…N (1≤N≤100,000), organize t he company as a tree, with cow 1 as the preside…