1151 LCA in a Binary Tree (30 分) 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. Given any two nodes in a binary tree, you are supposed to find their LCA. Input Specification:…

Source: PAT A1151 LCA in a Binary Tree (30 分) Description: 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. Given any two nodes in a binary tree, you are supposed to find their…

LCA in a Binary Tree PAT-1151 本题的困难在于如何在中序遍历和前序遍历已知的情况下找出两个结点的最近公共祖先. 可以利用据中序遍历和前序遍历构建树的思路,判断两个结点在根节点的左右子树,依次递归找到最近祖先 import java.util.HashMap; import java.util.Map; import java.util.Scanner; import java.util.TreeMap; /** * @Author WaleGarrett * @Dat…

236. Lowest Common Ancestor of a Binary Tree /** * 基础版 * 给定p,q都是在树中 * 有两种情况: * 1. p和q分布在LCA的两侧 * 2. p和q在同一侧(p是q的祖先 或者是 q是p的祖先) * 先考虑第一种情况,例如: * 1 * / \ * 2 4 * 2和4的LCA是1,向下递归返回时,2返回2,4返回4,1接受到的left和right的返回值都存在值,那么就返回自己 * 也就是说=> 只要找到目标节点,就往上返回该节点 * -…

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. Given any two nodes in a binary tree, you are supposed to find their LCA. Input Specification: Each input file contains one test…

题目描述 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.Given any two nodes in a binary tree, you are supposed to find their LCA. 最小共同祖先(LCA)是一棵树中两个节点U和V最深的那个公共父节点.要求给一棵树,以及两个节点,请你…

https://pintia.cn/problem-sets/994805342720868352/problems/1038430130011897856 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. Given any two nodes in a binary tree, you are sup…

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. Given any two nodes in a binary tree, you are supposed to find their LCA. Input Specification: Each input file contains one test…

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. Given any two nodes in a binary tree, you are supposed to find their LCA. Input Specification: Each input file contains one t…

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. Given any two nodes in a binary tree, you are supposed to find their LCA. Input Specification: Each input file contains one test…