"We have an expected behaviour pattern [for protests]," one police officer has told the BBC anonymously. "But with this new generation, we do not understand their social media or how they mobilise on the ground."
// Transforms execute as we iterate。夫子是该领域的重要参考
，推荐阅读51吃瓜获取更多信息
Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.，推荐阅读同城约会获取更多信息
// 步骤4：扩展左边界（向左找所有minVal的元素，全程不越界）