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…

题目 The following is from Max Howell @twitter: Google: 90% of our engineers use the sofware you wrote (Homebrew), but you can't invert a binary tree on a whiteboard so fuck of. Now it's your turn to prove that YOU CAN invert a binary tree! Input Speci…

题目 There is a kind of balanced binary search tree named red-black tree in the data structure. It has the following 5 properties: (1) Every node is either red or black. (2) The root is black. (3) Every leaf (NULL) is black. (4) If a node is red, then…

题目 A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The lef subtree of a node contains only nodes with keys less than or equal to the node's key. The right subtree of a node contains only nodes wi…

简单题. #include<cstdio> #include<cstring> #include<cmath> #include<vector> #include<map> #include<queue> #include<stack> #include<algorithm> using namespace std; struct Node { int left; int right; }s[]; int n;…

题目 A supply chain is a network of retailers(零售商), distributors(经销商), and suppliers(供应商)–everyone involved in moving a product from supplier to customer. Starting from one root supplier, everyone on the chain buys products from one's supplier in a pri…

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…

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:…

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…

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…