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 p and q as the lowest node in T that has…

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 p and q as the lowest node in T that has both p and q…

［抄题］: Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that has both v and w as descendants (where we allow a node to b…

基于深度的LCA算法:  对于两个结点u.v,它们的深度分别为depth(u).depth(v),对于其公共祖先w,深度为depth(w),u需要向上回溯depth(u)-depth(w)步,v需要depth(v)-depth(w)步. 因此,只需要u,v中深度较大的向上移,直到 depth(u)=depth(v) && 此时指向一个结点. 因此,求出LCA的时间复杂度为O(depth(u)+depth(v)):   求深度,只需要进行一次遍历,O(n). 如果是完全二叉树的话,相当于深度…

  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 p and q as the lowest node in T that has both p and…

  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…

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…

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…

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…

Leetcode之深度优先搜索(DFS)专题-1123. 最深叶节点的最近公共祖先(Lowest Common Ancestor of Deepest Leaves) 深度优先搜索的解题详细介绍,点击 给你一个有根节点的二叉树,找到它最深的叶节点的最近公共祖先. 回想一下: 叶节点 是二叉树中没有子节点的节点 树的根节点的 深度 为 0,如果某一节点的深度为 d,那它的子节点的深度就是 d+1 如果我们假定 A 是一组节点 S 的 最近公共祖先,<font color="#c7254e&q…