Oftentimes I hear that “people are wasting their time watching TV” or that I am wasting time doing X or Y, but I wonder, what exactly is wasted time? And also what time isn’t wasted? I recognize that there are a lot of activities that I consider that my time…

In this problem, we are given a list of rings going into rods, and we should return how many rods have rings with all the possible colors. There are n rings and each ring is either red, green, or blue. The rings are distributed across ten rods labeled from 0…

In this problem, we try to figure out how long we can run n computers using a list of batteries. We have to use n different batteries at any moment and switching them can be done any time (as long as it is a whole minute). …

In this problem, we are trying to find a testing strategy to optimize the number of points in a test giving the following rules: You are given a 0-indexed 2D integer array questions where questions[i] = [pointsi, brainpoweri]. The array describes the questions of an exam, where you have to…

In this exercise, we are trying to obtain a target number using +1 and *2 operations, we also have a limited number of *2 operations: You are playing a game with integers. You start with the integer 1 and you want to reach the integer target. In one move, you can…

In this problem, we divide a String into a list of substrings of size k. In the last String is not of size k, we complete the string with a fill character until the string is of size k. Example: s = "abcdef", k = 4, fill = 'x' Return…

In this problem, we are trying to figure the list of recipes that we can make out of a list of ingredients in unlimited quantity. The difficulty comes from the fact that in the list of ingredients necessary for each recipe, there can be another recipe itself. You have information…

In this problem, we want to find the first String that is a palindrome in an array of Strings. Given an array of strings words, return the first palindromic string in the array. If there is no such string, return an empty string "". A string is palindromic if it…

In this Leetcode problem, we are asked to transform some words from an array of words to target words. Any word from the initial array can be used to be transformed in a target word using a specific transformation rule. You are given two 0-indexed arrays of strings startWords and…