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_SCORE_MIN = 0.001
_SCORE_MAX = 0.999


def compute_score(completed, on_time, total_jobs, late_jobs, task="easy"):
    if total_jobs == 0:
        return _SCORE_MIN
    completion_rate = completed / total_jobs
    on_time_rate = on_time / max(completed, 1)
    utilization_bonus = max(0.0, 1.0 - late_jobs / max(completed, 1))
    score = 0.5 * completion_rate + 0.3 * on_time_rate + 0.2 * utilization_bonus
    return round(max(_SCORE_MIN, min(_SCORE_MAX, score)), 4)


def score_episode(env) -> float:
    total = len(env.completed_jobs) + len(env.jobs)
    completed = len(env.completed_jobs)
    on_time = sum(1 for j in env.completed_jobs if env.time <= j.deadline)
    return compute_score(completed, on_time, total, env.late_jobs, env.task)