def select(lineups, elite_rate=0.1):
    num_elite = int(len(lineups)*0.1)

    # sort lineups according to score
    scores = [lineup.score for lineup in lineups]
    order = np.argsort(scores)
    sorted_lineups = [lineups[i] for i in order]

    # get 10% elite and 80% mutation pool
    elite = sorted_lineups[len(lineups)-num_elite:]
    mutation_pool = sorted_lineups[num_elite:len(lineups)-num_elite]

    return elite, mutation_pool