HUSTOJ：Transit Tree Path

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HUSTOJ：Transit Tree Path

问题 D: Transit Tree Path You are given a tree with N vertices.Here, a tree is a kind of graph, and more specifically, a connected undirected graph with N−1 edges, where N is the number of its vertices.The i-th edge (1≤i≤N−1) connects Vertices ai and…

AtCoder ABC 070D - Transit Tree Path

传送门:http://abc070.contest.atcoder.jp/tasks/abc070_d 本题是一个图论问题——树(Tree). 有一棵结点数目为n的无向树.第i条边连接结点ai与bi,权值为ci.给出q次查询,以及一个整数k(1≤k≤n),第j次查询给出两个整数xj,yj(1≤xj,yj≤n),求解结点xj和yj通过结点k的最短路径长度. 树上的路径问题,可以通过DFS解决.以下代码片段计算结点间的路径长度dis. void dfs(int v) { vis[v] = true;…

Atcoder Beginner Contest 070 D - Transit Tree Path

题意:n个点,n-1条边,组成一个无向的联通图,然后给出q和k,q次询问,每次给出两个点,问这两个点之间的最短距离但必须经过k点. 思路:我当时是用优化的Dijkstra写的(当天刚学的),求出k点到各点的最短距离,跑了160+ms,其实用搜索写更快,组里的几个大佬都用搜索写的,我在搜索这方面还是比较弱的.还要多练练.然后今天早上用搜索写了一下,跑了60+ms,并且内存用的也很小. 题目链接:http://abc070.contest.atcoder.jp/tasks/abc070_d Dijk…

2018.7中石油个人赛第4场(D-Transit Tree Path)-最短路算法

6690: Transit Tree Path 时间限制: 1 Sec 内存限制: 128 MB提交: 472 解决: 132[提交] [状态] [讨论版] [命题人:admin] 题目描述 You are given a tree with N vertices.Here, a tree is a kind of graph, and more specifically, a connected undirected graph with N−1 edges, where N is the…

Lintcode376-Binary Tree Path Sum-Easy

376. Binary Tree Path Sum Given a binary tree, find all paths that sum of the nodes in the path equals to a given number target. A valid path is from root node to any of the leaf nodes. Example Example 1: Input: {1,2,4,2,3} 5 Output: [[1, 2, 2],[1, 4…