洛谷 SP14932 LCA - Lowest Common Ancestor 洛谷评测传送门 题目描述 A tree is an undirected graph in which any two vertices are connected by exactly one simple path. In other words, any connected graph without cycles is a tree. - Wikipedia The lowest common ancesto…

Description: 一棵树是一个简单无向图,图中任意两个节点仅被一条边连接,所有连通无环无向图都是一棵树.\(-Wikipedia\) 最近公共祖先(\(LCA\))是--(此处省去对\(LCA\)的描述),你的任务是对一棵给定的树\(T\)以及上面的两个节点\(u,v\)求出他们的\(LCA\). 例如图中9和12号节点的LCA为3号节点 Input: 输入的第一行为数据组数\(T\),对于每组数据,第一行为一个整数\(N(1\leq N\leq1000)\),节点编号从\(1\)到\(…

专业跟队形 唯一一个有$\LaTeX$的 裸的$LCA$,我用的是$Tarjan~LCA$,注意两点相同特判 #include<iostream> #include<cstdio> #include<cstring> using namespace std; ; struct edge{ int next,to; }e[maxn],q[maxn<<]; int n,m,s,head[maxn],cnt,ans[maxn],heads[maxn],f[maxn…

转自 剑指Offer之 - 树中两个结点的最低公共祖先 题目: 求树中两个节点的最低公共祖先. 思路一: ——如果是二叉树,而且是二叉搜索树,那么是可以找到公共节点的. 二叉搜索树都是排序过的,位于左子树的节点都比父节点小,而位于右子树上面的节点都比父节点大. 如果当前节点的值比两个结点 的值都大,那么最低的共同的父节点一定是在当前节点的左子树中,于是下一步遍历当前节点的左子节点. 如果当前节点的值比两个结点的值都小,那么最低的共同的父节点一定是在当前节点的右子树中,于是下一步遍历当前节点的右子…

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 Wikipedia: “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that has…

The lowest common ancestor (LCA) of two nodes U and V in a tree is the deepest node that has both U and V as descendants. A binary search tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a nod…

  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 Wikipedia: “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that ha…

题目链接 In a rooted tree, the lowest common ancestor (or LCA for short) of two vertices u and v is defined as the lowest vertex that is ancestor of both that two vertices. Given a tree of N vertices, you need to answer the question of the form "r u v&qu…

题目 The lowest common ancestor (LCA) of two nodes U and V in a tree is the deepest node that has both U and V as descendants. A binary search tree (BST) is recursively defined as a binary tree which has the following properties: The lef subtree of a n…

Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that has both v and w…