A tech test.
To run a command line program that will take an input file (input.txt) and write to stdout use the following command:
# run the rover missions.
$ go run ./cmd/rover_from_fileThe command line application can take some arguments.
-input {filename}- The input file of commands, defaults to
input.txt - If set to
@stdthe application will read the terminal input.
- The input file of commands, defaults to
-output {filename}- The output file of rover locations. Defaults to the terminal output.
- If set to
@stdthe application will write to the terminal output. - If set to a filepath the application will create and overwrite the file.
Alternately the required testcase can be found in the unit test at ./executor_test.go:13 and run using:
# run the test containing the supplied data.
$ go test -v -run TestProvidedFor testing and development information see DEVELOPMENT.md and the Makefile.
- Any issues whilst executing the provided instructions will result in a shutdown in the current state.
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 is represented by a combination of an 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).
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.
The output for each rover should be its final co-ordinates and heading.
5 5
1 2 N
LMLMLMLMM
3 3 E
MMRMMRMRRM
1 3 N
5 1 E