CareerCup

Imagine you are in the Point Origin with (0,0). Clearly, movement can be only X,Y. Thus, the way to handle it is simply keeping track of the co-ordinates in a set, and check if I have visited the point before or not.
If I did, I am inside a loop.

One more thing. The question is incomplete. It also should give the direction the robot is facing right now, is it N,E,W, S ?

l

,

Nothing fancy, short and simple... I'm keeping track of the direction that the robot is facing. I mod on the direction which then dictates how to update our (x,y) coordinates.

def robot_moves(moves):
    direction = 0
    move_sets = [[0,0]]
    for move in moves:
        if move == "L":
            direction += 1
        elif move == "R":
            direction -= 1
        elif move == "G":
            set_ = move_sets[-1].copy()
            print(set_)
            if direction % 4 == 0:
                set_[0] += 1
            elif direction % 4 == 1:
                set_[1] -= 1
            elif direction % 4 == 2:
                set_[0] -= 1
            elif direction % 4 == 3:
                set_[1] += 1
            if set_ in move_sets:
                return True
            move_sets.append(set_)
    return False