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大家小心呀!!The terms top left and bottom right do not imply any ordering of coordinates.这个意思，就是说最后二对坐标，可能不是一起的。就是要说那个左上的x1,y1和右下的x2,y2，存在这样的关系，x1<x2,y1>y2.但是输入的时候可能不是这样的! Followed by:
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