2418. Sort the People
You are given an array of strings names, and an array heights that consists of distinct positive integers. Both arrays are of length n. For each […]
Largest BST
Given a binary tree. Find the size of its largest subtree which is a Binary Search Tree.Note: Here Size equals the number of
2392. Build a Matrix With Conditions
You are given a positive integer k. You are also given: a 2D integer array rowConditions of size n where rowConditions[i] = [abovei, belowi], and a 2D integer
Maximum product subset of an array
Given an array arr. The task is to find and return the maximum product possible with the subset of elements present in the
1605. Find Valid Matrix Given Row and Column Sums
You are given two arrays rowSum and colSum of non-negative integers where rowSum[i] is the sum of the elements in the ith row and colSum[j] is the sum of the
Remove Half Nodes
You are given a binary tree and you need to remove all the half nodes (which have only one child). Return the
1380. Lucky Numbers in a Matrix
Given an m x n matrix of distinct numbers, return all lucky numbers in the matrix in any order. A lucky number is an element of the matrix such that it
Count Smaller elements
Given an array arr containing positive integers. Count and return an array ans where ans[i] denotes the number of smaller elements on right side of arr[i]. Examples:
1530. Number of Good Leaf Nodes Pairs
You are given the root of a binary tree and an integer distance. A pair of two different leaf nodes of a binary tree is
Longest alternating subsequence
You are given an array arr. Your task is to find the longest length of a good sequence. A good sequence {x1, x2, .. xn}
1110. Delete Nodes And Return Forest
Given the root of a binary tree, each node in the tree has a distinct value. After deleting all nodes with a
Construct Binary Tree from Parent Array
Given an array parent that is used to represent a tree. The array indices (0-based indexing) are the values of the tree