* @param mid 中间位置（左子数组结束位置）
Communicating on group chats has quickly become a way of life, but what are the rules?
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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.
考古学家袁靖认为：“先秦时期，马主要有三大用途：一是作为彰显地位的随葬品和祭祀品；二是作为挽车畜力，用于拉车、车战或驮物；三是用于骑乘，主要应用于战场。”春秋战国时期，孙阳（伯乐）擅长相马，马王堆汉墓出土有帛书《相马经》。从西汉景帝时期开始，逐渐出现“众庶街巷有马，阡陌之间成群”的景象，马的重要性日益凸显。东魏邺城时期，贾思勰编著的《齐民要术》中不仅保存了部分《相马经》，还发展出相马五脏法，对于马的饲养及医治记载得丰富详实。，推荐阅读safew官方下载获取更多信息