@classmethod
    def get_network_group_for_role(cls, network_role, _):
        return network_role['default_mapping']
Find the min height with no water that higher than the current height and keep it.
dataset/ETHPy150Open openstack/fuel-web/nailgun/nailgun/extensions/network_manager/managers/nova_network.py/NovaNetworkManager70.get_network_group_for_role--crossover with--dataset/ETHPy150Open algorhythms/LintCode/Trapping Rain Water II.py/Solution.trapRainWater