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Problem Statement for "SpaceDrone"

Problem Statement

Our unmanned space vehicle responds to command sequences where each command is a single uppercase character that describes an action relative to the current location and orientation of the drone:
  • F -- move forward one unit
  • Y -- yaw 90 degrees counterclockwise as seen from the top of the drone
  • R -- roll 90 degrees counterclockwise as seen from the back of the drone
Y causes a rotation around the axis through the top and bottom of the drone. R causes a rotation around the axis through the back and front of the drone. Initially the drone is located at x=0,y=0,z=0. It is oriented so that its back-to-front axis is in the positive x direction, and its bottom to top axis is in the positive y direction. Create a class SpaceDrone that contains a method whereAmI that takes a command sequence as input and returns the x coordinate of the resulting position.

Definition

Class:
SpaceDrone
Method:
whereAmI
Parameters:
String
Returns:
int
Method signature:
int whereAmI(String commands)
(be sure your method is public)

Notes

  • Notice that the orientation of the xyz coordinate system is irrelevant since you only need to return the final x coordinate.

Constraints

  • commands contains between 1 and 50 characters inclusive
  • each character in commands is uppercase F, Y, or R

Examples

  1. "FFF"

    Returns: 3

    The drone goes forward along the x axis 3 units, ending at (3,0,0)

  2. "YYRRYRY""

    Returns: 0

    The drone has done multiple rotations, but has never moved from (0,0,0)

  3. "YFYFY"

    Returns: -1

  4. "RFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFYF"

    Returns: 47

  5. "YFRFFYFFFRFFFFYFFFFF"

    Returns: 5

  6. "YYYYYYYYYYYFYFFYFFFYFFFFYFFFFF"

    Returns: -2

  7. "FYFFRFFFRFFFFYFFFFFYFFFFFF"

    Returns: 6

  8. "FYFFRFFFRFFFFYFFFFFYFFFFFFRRYFFFFFFFFF"

    Returns: 15

  9. "YYFFFFFRYYFF"

    Returns: -3

  10. "FRYRRYYF"

    Returns: 1

  11. "FRFFYFFFRFFFFRFFFFFYFFFFFFYF"

    Returns: 9

  12. "YFRRYFFFY"

    Returns: 3

  13. "RFYFFRFFFYFFFFRFFFFFFFFYFFFFFFFYFFFYFFFFYFFFFFF"

    Returns: 4

  14. "YYRFYFFRFFFYFFFFRFFFFFFFFYFFFFFFFYFFFYFFFFYFFFFFF"

    Returns: -4

  15. "YFYFYFYFRYFYFYFYFRYFYFYFYFRYFYFYFYFR"

    Returns: 0

  16. "YRYFYFYFYFRRYFYFYFYF"

    Returns: 0

  17. "RYRFYYFFRRYFFFYRRRFYFFFYYFYFRRYRFFRFRRRRRYRFRRRFRF"

    Returns: -1

  18. "RRYRFRYFRRYRYRYYRFFFFRYFFRRFFYFYYRFFFYFRYFRFFFRYFF"

    Returns: 1

  19. "YRFRRFFFYRFYYFYRFYFFYRFRRFFFYRFFYRRFYFFRRFYFFYRF"

    Returns: -3

  20. "FFRYFFFFRYYYRFRFRYYRRRRRRYRRFYRFRYFFYYRFYRFYFRRFFY"

    Returns: 0

  21. "FYFFYFYRRYYRFRFYRRYRRFYYFFYRYFYRRFFRRYYFFRYYFRFYYY"

    Returns: -2

  22. "YYFYRRFRFFYRYFRRYRRFFYYRYFRYFYRYRFFYRFFFRYRRFFRFYY"

    Returns: 4

  23. "RYYYFYFYRRFFYRRRYFYYYYFFFYFYRYRYFRRFYRFFFRYRYFYFFF"

    Returns: 1

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