LCP 03.机器人大冒险

def robot(command, obstacles, x, y):
    xx = 0
    yy = 0
    tmp = []
    for c in command:
        if c == 'U':
            yy += 1
        if c == 'R':
            xx += 1
        tmp.append([xx, yy])
    #print(tmp)
    index, times= -1, -1
    for i in range(len(tmp)):
        tx, ty = tmp[i]
        if (x-tx)%xx ==0 and (y-ty)%yy == 0 and (x-tx)//xx == (y-ty)//yy:
            index, times = i, (x-tx)//xx
            break
    if index==-1:
        return False
    for ob in obstacles:
        ox, oy = ob
        oidx, otimes = -1, -1
        for i in range(len(tmp)):
            tx, ty = tmp[i]
            if (ox - tx) % xx == 0 and (oy - ty)%yy == 0 and (ox - tx) // xx == (oy - ty) // yy:
                oidx, otimes = i, (ox - tx) // xx
                break
        if oidx!=-1 and otimes!=-1 and (otimes<times or otimes==times and oidx<=index):
            return False
    return  True

print(robot('URR', [[4, 2]],3,2))