Aizu 2677 Breadth-First Search by Foxpower LCA+bfs

A - Breadth-First Search by Foxpower Problem Statement Fox Ciel went to JAG Kingdom by bicycle, but she forgot a place where she parked her bicycle. So she needs to search it from a bicycle-parking area before returning home. The parking area is form…

TTTTTTTTTTTTTTTT #7 div1 A Breadth-First Search by Foxpower 在线LCA（倍增）,模拟

A - Breadth-First Search by Foxpower Time Limit:2000MS Memory Limit:131072KB 64bit IO Format:%lld & %llu Submit Status Description A - Breadth-First Search by Foxpower Problem Statement Fox Ciel went to JAG Kingdom by bicycle, but she forgot…

广度优先搜索（Breadth First Search, BFS）

广度优先搜索(Breadth First Search, BFS) BFS算法实现的一般思路为: // BFS void BFS(int s){ queue<int> q; // 定义一个队列 q.push(s); // 队首元素入队 while (!q.empty()){ // 取出队首元素top // 访问队首元素 // 将队首元素出队 // 将top的下一层结点中未曾入队的结点全部入队,并设置为已入队 } } 常见题型一: 代码实现: #include <stdio.h> #…

LeetCode Lowest Common Ancestor of a Binary Search Tree （LCA最近公共祖先）

题意: 给一棵二叉排序树,找p和q的LCA. 思路: 给的是BST(无相同节点),那么每个节点肯定大于左子树中的最大,小于右子树种的最小.根据这个特性,找LCA就简单多了. 分三种情况: (1)p和q都在root左边,那么往root左子树递归. (2)在右同理. (3)一左一右的,那么root->val肯定大于其中的1个,小于另一个. /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNod…

广度优先搜索（Breadth First Search）

Date:2019-07-03 14:29:02 走完一层的所有房间,再走下一层,用队列实现算法实现 /*--------------------------模版----------------------*/ void BFS(int s) { queue<int> q; q.push(s); while(!q.empty()) { //取出队首元素top //访问队首元素top //将队首元素出列 //将top的下一层结点中未曾入队的结点全部入队,并设置为已入队 } } /*------…

BNUOJ 52303 Floyd-Warshall Lca+bfs最短路

题目链接: https://www.bnuoj.com/v3/problem_show.php?pid=52303 Floyd-Warshall Time Limit: 60000msMemory Limit: 1048576KB 问题描述 In ICPCCamp, there are n cities and m (bidirectional) roads between cities. The i-th road is between the ai-th city and the bi-th…

最小生成树Kruskal+LCA+bfs【bzoj4242】水壶

Description JOI 君所居住的 IOI 市以一年四季都十分炎热著称. IOI 市被分成 \(H\) 行,每行包含 \(W\) 块区域.每个区域都是建筑物.原野.墙壁之一. IOI 市有 \(P\) 个区域是建筑物,坐标分别为 \((A_1, B_1)(A_2, B_2)\dots(A_P, B_P)\). JOI 君只能进入建筑物与原野,而且每次只能走到相邻的区域中,且不能移动到市外. JOI 君因为各种各样的事情,必须在各个建筑物之间往返.虽然建筑物中的冷气设备非常好,但原野上太阳…

Codevs1026 SEARCH(逃跑的拉尔夫 )(BFS)

SEARCH 时间限制: 1 Sec 内存限制: 128 MB提交: 11 解决: 4[提交][状态][讨论版] 题目描述年轻的拉尔夫开玩笑地从一个小镇上偷走了一辆车,但他没想到的是那辆车属于警察局,并且车上装有用于发射车子移动路线的装置. 那个装置太旧了,以至于只能发射关于那辆车的移动路线的方向信息. 编写程序,通过使用一张小镇的地图帮助警察局找到那辆车.程序必须能表示出该车最终所有可能的位置. 小镇的地图是矩形的,上面的符号用来标明哪儿可以行车哪儿不行.“.”表示小镇上那块地方是可以行…

hdu-2586 How far away ？(lca+bfs+dfs+线段树)

题目链接: How far away ? Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Problem Description There are n houses in the village and some bidirectional roads connecting them. Every day peole always like to ask like th…

【WIP_S9】图论算法

创建: 2018/06/01 图的概念有向边有向图无向边无向图点的次数: 点连接的边的数量闭路: 起点和重点一样连接图: 任意两点之间都可到达无闭路有向图: 没有闭路的有向图森林: 互素的树的集合生成树: 含有图里所有点的树生成树林: 所有生成树的并集图论算法的应用 ● 电路的元件关系 ● 交通网 ● 电脑网络(本地网络, 互联网, web等) ● 数据库(实体关系图(ER图)) 图的数据结构邻接矩阵适用于数据多的 //-----…

别再埋头刷LeetCode之：北美算法面试的题目分类，按类型和规律刷题，事半功倍

算法面试过程中,题目类型多,数量大.大家都不可避免的会在LeetCode上进行训练.但问题是,题目杂,而且已经超过1300道题. 全部刷完且掌握,不是一件容易的事情.那我们应该怎么办呢?找规律,总结才是制胜法宝. 下面我们就来看看 Grokking the Coding Interview: Patterns for Coding Questions 的分类及每个类型的经典题目: 1. Pattern: Sliding window,滑动窗口类型经典题目: Maximum Sum Subar…

[Algorithm] Breadth First JavaScript Search Algorithm for Graphs

Breadth first search is a graph search algorithm that starts at one node and visits neighboring nodes as widely as possible before going further down any other path. This algorithm requires the use of a queue to keep track of which nodes to visit, so…

[数据结构]——二叉树（Binary Tree）、二叉搜索树（Binary Search Tree）及其衍生算法

二叉树(Binary Tree)是最简单的树形数据结构,然而却十分精妙.其衍生出各种算法,以致于占据了数据结构的半壁江山.STL中大名顶顶的关联容器--集合(set).映射(map)便是使用二叉树实现.由于篇幅有限,此处仅作一般介绍(如果想要完全了解二叉树以及其衍生出的各种算法,恐怕要写8~10篇). 1)二叉树(Binary Tree) 顾名思义,就是一个节点分出两个节点,称其为左右子节点:每个子节点又可以分出两个子节点,这样递归分叉,其形状很像一颗倒着的树.二叉树限制了每个节点最多有两个子节…

leetcode面试准备:Lowest Common Ancestor of a Binary Search Tree & Binary Tree

leetcode面试准备:Lowest Common Ancestor of a Binary Search Tree & Binary Tree 1 题目 Binary Search Tree的LCA Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST. According to the definition of LCA on Wikiped…

[Algorithm] Write a Depth First Search Algorithm for Graphs in JavaScript

Depth first search is a graph search algorithm that starts at one node and uses recursion to travel as deeply down a path of neighboring nodes as possible, before coming back up and trying other paths. const {createQueue} = require('./queue'); func…

[USACO08OCT]牧场散步Pasture Walking BZOJ1602 LCA

题目描述 The N cows (2 <= N <= 1,000) conveniently numbered 1..N are grazing among the N pastures also conveniently numbered 1..N. Most conveniently of all, cow i is grazing in pasture i. Some pairs of pastures are connected by one of N-1 bidirectional…

LeetCode Day3

Lowest Common Ancestor of a Binary Search Tree import java.util.ArrayList; import java.util.List; /** * LeetCode: Lowest Common Ancestor of a Binary Search Tree * Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given n…

Algorithms & Data structures in C++& GO ( Lock Free Queue)

https://github.com/xtaci/algorithms //已实现 ( Implemented ): Array shuffle https://github.com/xtaci/algorithms/blob/master/include/shuffle.h Prime test(trial division) https://github.com/xtaci/algorithms/blob/master/include/prime.h Prime test(Miller-Ra…