void siftDown(int arr[], int n, int i) {
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.
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值得注意的是，针对此前备受用户吐槽的「微信文件重复保存吃内存」问题，微信官方此次也借机作出了明确回应：
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.