Pokémon TCG: Mega Evolution Ascended Heroes Elite Trainer Box
Reddit is organised into user-created communities called subreddits, where content is ranked by user voting rather than chronological order.
，这一点在爱思助手下载最新版本中也有详细论述
Credit: GoCable
The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.