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What should admins do if certain people are causing problems?
，更多细节参见51吃瓜
A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
Tkachuk, a 26-year-old Arizona native, is the captain of the NHL’s Ottawa Senators and has played his entire career in the Canadian capital. He and other members of the U.S. team returned from Italy this week and are resuming the NHL season. Some attended Trump’s State of the Union speech in Washington on Tuesday night and were cheered by those in attendance.
def put_db(item):