Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
Google's content system recognised the slur being used within many pieces of online content. It then used the term to characterise the content it was pushing out to users.
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Фото: Yves Herman / Reuters
思路：倒序遍历 2 倍长度 + 取模模拟循环 + 单调栈。用 i % len 映射到真实索引，仅当 i < len 时记录答案。