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Illuminating polygons with vertex π-floodlights
Find how many half-plane floodlights placed at vertices always suffice to light a polygon with n vertices; the answer lies between 9n/14 and 2n/3.
PR
PR 把工作从一条路线带到另一条；合并它就是采纳。
没有开放的 PR
PR 把工作从一个分支带到另一个分支。