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An algorithm is a sequence of well-defined steps that defines an abstract solution to a problem. Use this tag when your issue is related to design and analysis of algorithms.

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Polynomial time algorithm for finding a maximal monotone subset

Input: Some fixed $k>1$, vectors $x_i,y_i\in\mathbb R^k$ for $1\le i\le n$. Output: A subset $I\subset\{1,\dots,n\}$ of maximal size such that $(x_i-x_j)^T(y_i-y_j) \ge 0$ for all $i,j\in I$. Question …