题面 Solution: 板子不解释 #include <iostream> #include <algorithm> #include <cstdio> #include <cstring> using namespace std; namespace io { char buf[1<<21], *pos = buf, *end = buf; inline char getc() { return pos == end && (…

题意 题目链接 Sol 线段树合并板子题 #include<bits/stdc++.h> using namespace std; const int MAXN = 400000, SS = MAXN * 21; inline int read() { char c = getchar(); int x = 0, f = 1; while(c < '0' || c > '9') {if(c == '-') f = -1; c = getchar();} while(c >=…

Description n只奶牛构成了一个树形的公司,每个奶牛有一个能力值pi,1号奶牛为树根. 问对于每个奶牛来说,它的子树中有几个能力值比它大的. Input n,表示有几只奶牛 n<=100000 接下来n行为1-n号奶牛的能力值pi 接下来n-1行为2-n号奶牛的经理(树中的父亲) Output 共n行,每行输出奶牛i的下属中有几个能力值比i大 Sample Input 5 804289384 846930887 681692778 714636916 957747794 1 1 2 3…

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 cow 1 as the…

传送门:http://www.lydsy.com/JudgeOnline/problem.php?id=4756 [题解] dsu on tree,树状数组直接上 O(nlog^2n) # include <vector> # include <stdio.h> # include <string.h> # include <iostream> # include <algorithm> // # include <bits/stdc++.…

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…

浅谈线段树合并:https://www.cnblogs.com/AKMer/p/10251001.html 题目传送门:https://lydsy.com/JudgeOnline/problem.php?id=4756 对于每个结点用一棵值域线段树维护子树内结点的信息,然后该查询查询该合并合并就好了. 时间复杂度:\(O(nlogn)\) 空间复杂度:\(O(nlogn)\) 代码如下: #include <cstdio> #include <algorithm> using na…

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…

传送门 此题很有意思,有多种解法 1.用天天爱跑步的方法,进入子树的时候ans-query,出去子树的时候ans+query,query可以用树状数组或线段树来搞 2.按dfs序建立主席树 3.线段树的合并 前两个都会,于是学习一下线段树的合并.. 道理用文字解释不清...直接看代码就能看懂.. 可以脑补出,合并的操作复杂度是logn的,总时间复杂度nlogn #include <cstdio> #include <cstring> #include <iostream>…

http://www.lydsy.com/JudgeOnline/problem.php?id=4756 水题一枚...但是我写了一个小时...手贱打反查不出来... 就是每次线段树合并,先把自己的儿子都合并了, 最后和自己合并... #include<bits/stdc++.h> using namespace std; ; vector<int> G[N]; int n, sum, cnt; ], lc[N * ], rc[N * ], ans[N], root[N * ];…

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 cow 1 as the…

随时可能弃坑. 因为不知道最近要刷啥所以就决定刷下usaco. 优先级排在学习新算法和打比赛之后. 仅有一句话题解.难一点的可能有代码. 优先级是Gold>Silver.Platinum刷不动...(可能有一两道?) 2015 Feb Gold BZOJ3939. [Usaco2015 Feb]Cow Hopscotch 这题洛谷数据过水,\(O(n^4)\)的dp跑的飞快...所以建议在bzoj写. 但是还是要考虑一下4次方的dp的...其实就是强行枚举转移点,我们可以试着维护前缀和,那么只要…

马上就要noi了……可能滚粗已经稳了……但是还是要复习模板啊 LCT: bzoj2049 1A 7min # include <stdio.h> # include <string.h> # include <iostream> # include <algorithm> // # include <bits/stdc++.h> using namespace std; typedef long long ll; typedef long dou…