1. A conveyor belt has packages that must be shipped from one port to another within days days. The ith package on the conveyor belt has a weight of weights[i]. Each day, we load the ship with packages on the conveyor belt (in the order given by weights). We will stop loading the ship when the next package would cause the weight of the ship to exceed the maximum weight capacity. Return the least weight capacity of the ship that will result in all the packages on the conveyor belt being shipped within days days.

2. Given a 2D grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by water.

3. Given a set of jobs and their dependencies, how would you determine the order of scheduling the jobs?

4. What are the differences between class-based and functional components?