Find the level with the maximum number of nodes in a binary tree.
Given the entry and exit timings for vehicles in a parking lot. Find the interval with maximum vehicles parked.
Find all triplets from an array which adds up to zero.
Given a 2D grid formed of 0’s and 1’s. Find the largest number of 1’s connected horizontally or vertically.
Serialize and deserialize a n-ary tree
Implement an LRU cache
A square grid is divided by slashes, find the number of regions formed.
Given a 2D array, find the longest increasing path without making any diagonal move.
Sort an array by a series of flips. For each flip select k elements from the start and reverse the subarray. Print the sequence of k’s required to sort.
Return all possible ways in which a string can be broken into substrings which are palindromic.
Detect cyclic dependencies in graph.
Find Longest palindromic substring in a given string.
Count frequency of elements in sorted array.
Check is the given tree a binary search tree.
Given a list of intervals, merge overlapping intervals.