Codeforces Round #530 Sum in the tree[贪心] /* 对于每一个u和他的儿子v 必定存在 $s[u]\leq min{s[v]}$ ,否则不合法(因为a_i\geq 0) 这样u和他所有儿子的点权和是 $$ s\left[ u \right] +\sum_{v\in son\left( u \right)}{s\left[ v \right] -s\left[
D. Sum in the tree 题目链接:https://codeforces.com/contest/1099/problem/D 题意: 给出一棵树,以及每个点的si,这里的si代表从i号结点到根节点的权值和。但是有些si=-1,这就相当于丢失了当前结点的数据。 假设原本每个点的权值为ai,那么现在求sum{ai}的最小为多少,ai为非负数。 题解: 这题可以单独...
Input The first line contains one integernn — the number of vertices in the tree (2≤n≤1052≤n≤105). The following line contains integersp2p2,p3p3, ...pnpn, wherepipi stands for the parent of vertex with indexii in the tree (1≤pi<i1≤pi...
D. Sum in the tree(树形+贪心),题目链接;http://codeforces.com/contest/1099/problem/D题目大意:给出一棵树,每个节点到根节点的路径上经过的所有点的权值之和,其深度为偶数的节点的信息全部擦除了,也就是用-1表示,让你求最终所有点权之和(要求最小)具体思路:对
You are given an undirected weighed tree with N node . You need to find maximum absolute path sum in the tree with atmost k inversions. In one inversion you can change the weight of an edge from negative to positive and vice versa.Compare Revisions History Revisions...
This gives us a way to find the amount of information on the merged component, but we still need a way to set each node in the component to have that amount of information. Fortunately, we don't have to do that! Since each node in a component has the same amount of information, we...
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You are given a permutationp. Calculate the total number of inversions in all permutations that lexicographically do not exceed the given one. As this number can be very large, print it modulo1000000007(109 + 7). The first line contains a single integern(1 ≤ n ≤ 106) —...
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3 seconds memory limit per test 256 megabytes input standard input output standard output This problem is given in two editions, which differ exclusively in the constraints on the number nn. You are given an array of integers a[1],a[2],…,a[n].a[1],a[2],…,a[n]. A block is a...