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• W2274097845 abstract "A covering integer program (CIP) is a mathematical program of the form min{c ⊤ x ∣ Ax ≥ 1, 0 ≤ x ≤ u, x ∈ ℤ n }, where all entries in A, c, u are nonnegative. In the online setting, the constraints (i.e., the rows of the constraint matrix A) arrive over time, and the algorithm can only increase the coordinates of x to maintain feasibility. As an intermediate step, we consider solving the covering linear program (CLP) online, where the integrality constraints are dropped. Our main results are (a) an O(log k)-competitive online algorithm for solving the CLP, and (b) an O(log k · log l)-competitive randomized online algorithm for solving the CIP. Here k ≤ n and l ≤ m respectively denote the maximum number of nonzero entries in any row and column of the constraint matrix A. Our algorithm is based on the online primal-dual paradigm, where a novel ingredient is to allow dual variables to increase and decrease throughout the course of the algorithm. It is known that this result is the best possible for polynomial-time online algorithms, even in the special case of set cover (where all entries in A, c, and u are 0 or 1." @default.
• W2274097845 created "2016-06-24" @default.
• W2274097845 creator A5051270969 @default.
• W2274097845 creator A5078381067 @default.
• W2274097845 date "2014-11-01" @default.
• W2274097845 modified "2023-09-26" @default.
• W2274097845 title "Approximating Sparse Covering Integer Programs Online" @default.
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• W2274097845 doi "https://doi.org/10.1287/moor.2014.0652" @default.
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