Test submission for the Wedding Shop

Dimitry Gofman

20200227

Notes:

I picked C# Desktop App with .Net 4.8 as my development environment. As I read the problem, I thought it's a good place to add some visualisations.

I tried to keep things simple and used some opportunities to demonstrate creative usage of C#. I’ve also added a few features like graph display and collision detection.

I’ve added a unit test project with a few tests. I didn’t make it exhaustive to save time, there’s just a few basic tests.

The program starts with the form. You can enter the input into the first text box in the specified protocol format. Click Run and the second text box should show the output.

The button click is an asynchronous event which runs the simulation task. This task parses the input. I’m using exception throwing to control program flow. A new Plateau object is initialised with the dataset, the output is computed and I’ve added a little graph there as well.

I’ve separated the problem into entities such as Rover and Plateau to highlight OOP. There are several things I would improve if I had more time. Also, in a production environment, I would use different techniques. I’m happy to talk about that at the interview.

Problem - Mars Rover A squad of robotic rovers are to be landed by NASA on a plateau on Mars. This plateau, which is curiously rectangular, must be navigated by the rovers so that their on-board cameras can get a complete view of the surrounding terrain to send back to Earth. A rover's position and location are represented by a combination of x and y co-ordinates and a letter representing one of the four cardinal compass points. The plateau is divided up into a grid to simplify navigation. An example position might be 0, 0, N, which means the rover is in the bottom left corner and facing North. In order to control a rover, NASA sends a simple string of letters. The possible letters are 'L', 'R' and 'M'. 'L' and 'R' makes the rover spin 90 degrees left or right respectively, without moving from its current spot. 'M' means move forward one grid point and maintain the same heading. Assume that the square directly North from (x, y) is (x, y+1). Write a simple application that takes a user's starting point, and then directional instructions and displays the resulting position to the user. INPUT The first line of input is the upper-right coordinates of the plateau, the lower-left coordinates are assumed to be 0,0. The rest of the input is information pertaining to the rovers that have been deployed. Each rover has two lines of input. The first line gives the rover's position, and the second line is a series of instructions telling the rover how to explore the plateau. The position is made up of two integers and a letter separated by spaces, corresponding to the x and y co-ordinates and the rover's orientation. Each rover will be finished sequentially, which means that the second rover won't start to move until the first one has finished moving. OUTPUT The output for each rover should be its final co-ordinates and heading. INPUT AND OUTPUT Test Input: 5 5 1 2 N LMLMLMLMM 3 3 E MMRMMRMRRM Expected Output:

1 3 N 5 1 E