This paper uses a new methodology for detecting this problem in this and related problems, exhibiting the property of "submodularity".

本文使用了一种新方法来检测此问题以及相关问题，从而展现出“子模性”的性质。

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This paper uses a new methodology which improved from normal greed algorithm for detecting this problem in this and related problems, exhibiting the property of "submodularity".

用改进贪婪算法来处理这种和类似问题，并阐述了“子模性”的概念。

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