利用树的前序和中序递归判定最小公共祖先~ 直接根据两个序列递归处理~ #include<bits/stdc++.h> using namespace std; ; int N,M; int pre[maxn],in[maxn]; unordered_map<int,int> pos; void lca (int inL,int inR,int preRoot,int a,int b) { if (inL>inR) return; int inRoot=pos[pre[preR…

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…

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

https://pintia.cn/problem-sets/994805342720868352/problems/994805359372255232 Given a tree, you are supposed to tell if it is a complete binary tree. Input Specification: Each input file contains one test case. For each case, the first line gives a p…

1102 Invert a Binary Tree(25 分) The following is from Max Howell @twitter: Google: 90% of our engineers use the software you wrote (Homebrew), but you can't invert a binary tree on a whiteboard so fuck off. Now it's your turn to prove that YOU CAN in…

此文章同步发布在CSDN上:https://blog.csdn.net/weixin_44385565/article/details/90317830   1110 Complete Binary Tree (25 分)   Given a tree, you are supposed to tell if it is a complete binary tree. Input Specification: Each input file contains one test case. For…

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

Given a tree, you are supposed to tell if it is a complete binary tree. Input Specification: Each input file contains one test case. For each case, the first line gives a positive integer N (≤) which is the total number of nodes in the tree -- and he…

题目 Given a tree, you are supposed to tell if it is a complete binary tree. Input Specification: Each input file contains one test case. For each case, the first line gives a positive integer N (<=20) which is the total number of nodes in the tree - a…

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…