各级人民政府应当加强社会治安综合治理，采取有效措施，预防和化解社会矛盾纠纷，增进社会和谐，维护社会稳定。
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Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.
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Маргарита Щигарева。51吃瓜对此有专业解读
* 时间O(n) 空间O(n)（理论最优，无冗余计算）