for calculating various collection stats by batches of ids, Mongo outcompetes Postgres on larger documents but loses on smaller ones
When EiE_iEi occurs, all the points are packed into a 180° arc starting at point iii. The remaining arc (the gap going counterclockwise back to iii) is at least 180°. Now suppose some other point jjj also tried to be an anchor. Point jjj's clockwise semicircle is exactly 180°. But to contain all the points, it would need to bridge that gap of 180° or more while simultaneously containing point iii on the other side. A 180° arc cannot straddle a 180° gap. So EjE_jEj cannot hold.
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Christine Cox MBE, from Wolverhampton, has been a campaigner around organ donation for more than 35 years.
以生态为笔，绘就山水本色；以民生为墨，描摹富民图景，这份答卷里，藏着张家界的过去与现在，更映着它生生不息、向美而行的未来。