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Problem · Design

Mars Rover Robot Controller

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Problem statement

You are controlling a rover on an infinite two-dimensional grid. The rover starts at coordinate (x, y) and faces one of four directions: N, E, S, or W.

You are given a command string containing the characters L, R, and M. Command L turns the rover left by 90 degrees, R turns it right by 90 degrees, and M moves it forward one cell in its current direction.

After executing all commands, return the rover's final position and direction in the format "x y D".

Function

getRoverPosition(start: int[], direction: String, commands: String) → String

Examples

Example 1

start = [0, 0]direction = "N"commands = "MRMLM"return = "1 2 N"

The rover moves north to (0, 1), turns east, moves to (1, 1), turns north, and moves to (1, 2).

Example 2

start = [2, 3]direction = "E"commands = "MMRMM"return = "4 1 S"

The rover moves east twice to (4, 3), turns south, then moves south twice to (4, 1).

Constraints

  • start.length == 2
  • direction is one of "N", "E", "S", or "W".
  • commands contains only L, R, and M.
  • The grid is unbounded for this base version.
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public String getRoverPosition(int[] start, String direction, String commands) {
  // write your code here
}
start[0, 0]
direction"N"
commands"MRMLM"
expected"1 2 N"
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