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DA79--四通八达.md
假设正在开发一个类似微信的社交应用。在微信中,用户之间可以互加“好友”——这种关系是双向的:如果 Alice 是 Bob 的好友,那么 Bob 也一定是 Alice 的好友。 但这种方法存在明显缺陷:若想找出 Alice 的所有好友,必须遍历整个列表,逐条检查是否包含 "Alice ...
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