题意:给出一棵根节点为1的树,执行m次修改操作,每次修改为a,b,c,表示a节点的子树中,距离a小于等于b的子节点的权值加上c,求m次操作后每个节点的权值 分析:用线段树维护每层节点的权值,然后dfs遍历这颗树,当前节点有操作时,把当前节点的深度到被修改的最大深度都加上c(实际上只有当前节点的子节点才加c),而回朔的时候再将这个区间减c,这样就避免了对非子节点的影响 AC代码(线段树的区间更新): #include<bits/stdc++.h> #define ll long long usi…
题面 Vasya has a tree consisting of n vertices with root in vertex 1. At first all vertices has 0 written on it. Let d(i,j) be the distance between vertices i and j, i.e. number of edges in the shortest path from i to j. Also, let's denote k-subtree of…
CodeForces - 1076E Problem Description: Vasya has a tree consisting of n vertices with root in vertex 1. At first all vertices has 0 written on it. Let d(i,j) be the distance between vertices i and j, i.e. number of edges in the shortest path from i…
题目链接:传送门 题目: E. Vasya and a Tree time limit per test seconds memory limit per test megabytes input standard input output standard output Vasya has a tree consisting of n vertices with root . At first all vertices has written on it. Let d(i,j) be the…
E - Vasya and a Tree 思路: dfs动态维护关于深度树状数组 返回时将当前节点的所有操作删除就能保证每次访问这个节点时只进行过根节点到当前节点这条路径上的操作 代码: #pragma GCC optimize(2) #pragma GCC optimize(3) #pragma GCC optimize(4) #include<bits/stdc++.h> using namespace std; #define fi first #define se second #de…
Vasya has a tree consisting of n n vertices with root in vertex 1 1 . At first all vertices has 0 0 written on it. Let d(i,j) d(i,j) be the distance between vertices i i and j j , i.e. number of edges in the shortest path from i i to j j . Also, let'…
Necklace HDU - 3874 Mery has a beautiful necklace. The necklace is made up of N magic balls. Each ball has a beautiful value. The balls with the same beautiful value look the same, so if two or more balls have the same beautiful value, we just count…
BZOJ_1803_Spoj1487 Query on a tree III_主席树 Description You are given a node-labeled rooted tree with n nodes. Define the query (x, k): Find the node whose label is k-th largest in the subtree of the node x. Assume no two nodes have the same labels. I…
转自:https://blog.csdn.net/radianceblau/article/details/74722395 版权声明:本文为博主原创文章,未经博主允许不得转载.如本文对您有帮助,欢迎点赞评论. https://blog.csdn.net/RadianceBlau/article/details/74722395本系列导航: Linux DTS(Device Tree Source)设备树详解之一(背景基础知识篇) Linux DTS(Device Tree Source)设备树…
[101-Symmetric Tree(对称树)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: 1 / \ 2 2 / \ / \ 3 4 4 3 But the following is…