int n1 = mid - left; // 左子数组长度
公安机关不得因违反治安管理行为人的陈述、申辩而加重其处罚。
输入：num = "1432219", k = 3，这一点在91视频中也有详细论述
商务部公布调整对加拿大反歧视措施
，更多细节参见51吃瓜
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7. 系统提示词（可直接用作第一版）。夫子是该领域的重要参考