import math

RADIO_IDLE = 0
RADIO_RX = 1
RADIO_TX = 2
RADIO_BUSY = 3

def distance(r1, r2):
    a = abs(r1.x - r2.x)
    b = abs(r1.y - r2.y)
    return int(math.sqrt(a*a + b*b))

def neighbors(me, world, radius):
    ney = []
    for target in world:
        if distance(me, target) <= radius:
            ney.append(target)
    return ney

class radio:
    def __init__(self,x,y):
        self.state = RADIO_IDLE
        self.tick = 0
        self.x = x
        self.y = y
    def tickle(self):
        self.tick+=1