Input: Inorder traversal in[] = {4, 2, 5, 1, 3, 6} Preorder traversal pre[] = {1, 2, 4, 5, 3, 6} Output: Postorder traversal is {4, 5, 2, 6, 3, 1} A naive solution is to first construct the given tree, then recursively traverse it in post order. A better solution...
/* 1. Construct the BST from the given sequence in a preorder fashion */ // stores index of the next unprocessed node in the sequence int index = 0; // set the root node's range as [-INFINITY, INFINITY] and recur Node* root = buildTree(seq, index, INT_MIN, INT_MAX); /* 2...
0103-Binary-Tree-Zigzag-Level-Order-Traversal/cpp-0103 0104-Maximum-Depth-of-Binary-Tree 0105-Construct-Binary-Tree-from-Preorder-and-Inorder Traversal/cpp-0105 0106-Construct-Binary-Tree-from-Inorder-and-Postorder Traversal/cpp-0106 0107-Binary-Tree-Level-Order-Traversal-II/cpp-0107 0108...
We can optimize the runtime toO(n)byhashingusing a approach similar tofinding pairs in an array with a given sum. The idea is to traverse the tree inpreorder fashionand keep track of the sum of nodes between the current node and the root node in a variablesum_so_far. We also maintai...
Full binary tree is a BST. Solution Approach A simple solution to the problem is to perform in-order traversal of the tree. And for each node of the tree, check if its subtrees are BST or not. At last return the size of the largest subtree which is a BST. Example ...
So considering that all elements in the right subtree should be more than the root node itself That means all elements after the next greater element should be greater than the root. If it fails then we can conclude that it's not a valid preorder traversal fo...
1#include <iostream>2#include <vector>3#include <algorithm>4#include <queue>5#include <stack>6#include <string>7#include <fstream>8usingnamespacestd;910structnode {11intdata;12structnode *left, *right;13node() : data(0), left(NULL), right(NULL) { }14node(intd) : data(d), left...
Given a binary tree root and an integer target, delete all the leaf nodes with value target. Note that once you delete a leaf node with value target, if it’s parent node becomes a leaf node and has the value target, it should also be deleted (you need to continue doing that until ...
0105-Construct-Binary-Tree-from-Preorder-and-Inorder Traversal/cpp-0105 0106-Construct-Binary-Tree-from-Inorder-and-Postorder Traversal/cpp-0106 0106-Construct-Binary-Tree-from-Inorder-and-Postorder Traversal/cpp-0106 0107-Binary-Tree-Level-Order-Traversal-II/cpp-0107 0107-Binary-Tree-Level-Order...
0104-Maximum-Depth-of-Binary-Tree 0105-Construct-Binary-Tree-from-Preorder-and-Inorder Traversal/cpp-01050106-Construct-Binary-Tree-from-Inorder-and-Postorder Traversal/cpp-01060107-Binary-Tree-Level-Order-Traversal-II/cpp-0107 0108-Convert-Sorted-Array-to-Binary-Search-Tree/cpp-0108 ...