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arXiv 2610.20140cs.DSmath.OC
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拟阵约束下非单调k-子模最大化的解析0.48-近似算法

An Analytic 0.48-Approximation for Non-Monotone k-Submodular Maximization under a Matroid Constraint

University of Chinese Academy of Sciences(中国科学院大学)

Zizong Wang, Yibo Wang, Wenguo Yang

AI总结:

本研究针对k≥2的拟阵约束下非单调k-子模最大化问题,提出结合前二标签规则等的随机多项式时间算法,在值预言模型中取得0.48的近似保证。

摘要:

我们针对任意k≥2的情况,给出了拟阵约束下非负非单调k-子模函数最大化问题的随机多项式时间0.48-近似算法。该算法结合了前二标签规则、嵌套链势函数与最大权拟阵基。其分析将近似保证归结为一维时间分配:均匀局部下界导出线性微分方程,凹性闭合剩余区间,两个基本预算完成证明。时间预算的严格节省吸收了采样与离散化误差,在值预言模型中得到精确的0.48保证。

英文摘要:

We give a randomized polynomial-time $0.48$-approximation for maximizing a nonnegative non-monotone $k$-submodular function under a matroid constraint, for every $k\ge2$. The algorithm combines a top-two label rule with a nested-chain potential and maximum-weight matroid bases. Its analysis reduces the approximation guarantee to a one-dimensional time allocation: a uniform local lower bound leads to a linear differential equation, concavity closes the remaining interval, and two elementary budgets complete the proof. A strict saving in the time budget absorbs sampling and discretization errors, yielding the exact $0.48$ guarantee in the value-oracle model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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