def hackerlandRadioTransmitters(x, k):
    locations = sorted(x)
    station_location = first_house_outside_coverage = one_side_covered = two_side_coverage_counter = 0

    while station_location < len(locations):
        station_location_0 = station_location

        while first_house_outside_coverage < len(locations) and locations[first_house_outside_coverage] <= locations[station_location] + k:
            first_house_outside_coverage += 1

        if first_house_outside_coverage == station_location_0 + 1 or one_side_covered:
            station_location = first_house_outside_coverage
            two_side_coverage_counter += 1
            one_side_covered = 0
        else:
            station_location = first_house_outside_coverage - 1
            one_side_covered = 1

    return two_side_coverage_counter