Sum of Multiples of 3 and 5
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is …
Algorithms to Group Words by Anagrams
Given an array of strings, group anagrams together. Example: Input: , Output: , , ] Note: All inputs will be in lowercase. The order of your output does not …
Algorithm to Count the Largest Group of Digit Sums
Given an integer n. Each number from 1 to n is grouped according to the sum of its digits. Return how many groups have the largest size. Example 1: …
How to Design Underground System using Several Hash Maps?
Implement the class UndergroundSystem that supports three methods: 1. checkIn(int id, string stationName, int t) A customer with id card equal to id, gets in the station stationName at …
How to Remove Zero Sum Consecutive Nodes from Linked List using Prefix Sum?
Given the head of a linked list, we repeatedly delete consecutive sequences of nodes that sum to 0 until there are no such sequences. After doing so, return the …
Depth First Search and Breadth First Search Algorithm to Open the Doors to the Rooms with Keys
There are N rooms and you start in room 0. Each room has a distinct number in 0, 1, 2, …, N-1, and each room may have some keys …