Print nodes of a binary tree in vertical order
Given a binary tree, print its nodes in vertical order. Assume that the left and right child of a node makes a 45–degree angle with the parent.
Tag: Recursive
Link nodes present in each level of a binary tree in the form of a linked list
Given a binary tree, write an efficient algorithm to link nodes at the same level in the form of a linked list like structure.
Implementation of Treap Data Structure (Insert, Search, and Delete)
This post will implement a treap data structure, a combination of a binary search tree and a heap, and perform basic operations like insert, search, and delete on it.
Implement a queue using the stack data structure
This post will implement a queue using the stack data structure. In other words, design a queue that supports enqueue and dequeue operations using standard push and pop operations of the stack.
Find preorder traversal of a binary tree from its inorder and postorder sequence
Write an efficient algorithm to find a binary tree’s preorder traversal from its inorder and postorder sequence without constructing the tree.
Find all n-digit numbers with equal sum of digits at even and odd indices
Find all n–digit numbers with an equal sum of digits at even and odd index, where n varies from 1 to 9.
Find total ways to achieve a given sum with `n` throws of dice having `k` faces
Calculate the total number of ways to achieve a given sum with n throws of dice having k faces.
Count all subtrees having the same value of nodes in a binary tree
Given a binary tree, count all subtrees in it such that every node in the subtree has the same value.
Find inorder successor for the given key in a BST
Given a BST, find the inorder successor of a given key in it. If the given key does not lie in the BST, then return the next greater key (if any) present in the BST.
Find the maximum sum path between two leaves in a binary tree
Given a binary tree, write an efficient algorithm to find the maximum sum path between any two leaves in it.
Find all nodes at a given distance from leaf nodes in a binary tree
Given a binary tree, write an efficient algorithm to find all nodes present at a given distance from any leaf node. We need to find only those nodes that are present in the root-to-leaf path for that leaf.
Fix a binary tree that is only one swap away from becoming a BST
Given a binary tree that is only one swap away from becoming a BST, convert it into a BST in a single traversal.