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Theorem 1. There is an $O(n\log n)$-time algorithm for the problem in the post. Proof. We first state two utility lemmas, for an arbitrary edge-weighted graph $G$. We postpone their proofs, which are standard, to the end. Here is the first lemma. Most likely this is already in the Monma and Suri paper. Given any bipartition $(C_1, C_2)$ of $G$, let $W(C_1, ...


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If you rotate your rectangles through a common origin, then your method works. Your method works if there always exists a separating line that is parallel to a side of one of your rectangles. Such a line indeed exists. To see this, start from an arbitrary separating line and rotate it until it hits both rectangles, say in vertices $p$ and $q$. For a given ...


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