Best Yanmega deal
* 时间O(n) 空间O(n)（理论最优，无冗余计算/存储）
。旺商聊官方下载是该领域的重要参考
（七）利用职务上的便利收受他人财物或者谋取其他利益的；
Think about how you'd search a large room for a lost key. You wouldn't examine every square inch sequentially. You'd split the room into sections (by the couch, near the door, under the table) and rule out entire sections at a glance. "I didn't go near the kitchen, so skip that."
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