PROBLEM DESCRIPTION Given arrival and departure times of all trains that reach a railway station. Find the minimum number of platforms required for the railway station so that no train is kept wai...

PROBLEM DESCRIPTION Given an array of integers. Find the Inversion Count in the array. Two array elements arr[i] and arr[j] form an inversion if arr[i] > arr[j] and i < j. Inversion Count: ...

PROBLEM DESCRIPTION Given an array arr[] denoting heights of N towers and a positive integer K. For each tower, you must perform exactly one of the following operations exactly once. Increase...

Problem Description You are given two strings word1 and word2. Merge the strings by adding letters in alternating order, starting with word1. If a string is longer than the other, append the addit...

Problem Description Implement a thread-safe bounded blocking queue that has the following methods: BoundedBlockingQueue(int capacity) The constructor initializes the queue with a maximum capac...

Problem Description You have a keypad with 9 buttons, numbered from 1 to 9, each mapped to lowercase English letters. You can choose which characters each button is matched to as long as: All ...

Problem Description You are given a 0-indexed integer array nums. Swaps of adjacent elements are able to be performed on nums. A valid array meets the following conditions: The largest eleme...

Problem Description You are given the head of a linked list with n nodes. For each node in the list, find the value of the next greater node. That is, for each node, find the value of the first n...

Problem Description You are given a 0-indexed string hamsters where hamsters[i] is either: ‘H’ indicating that there is a hamster at index i, or ’.’ indicating that index i is empty. You w...

PROBLEM DESCRIPTION Given a binary matrix your task is to find all unique rows of the given matrix in the order of their appearance in the matrix. geeksforgeeks SOLUTION For each row, we conver...