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The sum of root-leaf distance interdiction problem by upgrading edges/nodes on trees

Author

Listed:
  • Qiao Zhang

    (Southeast University)

  • Xiucui Guan

    (Southeast University)

  • Junhua Jia

    (Southeast University)

  • Xinqiang Qian

    (Southeast University)

Abstract

Network interdiction problems by upgading critical edges/nodes have important applications to reduce the infectivity of the COVID-19. A network of confirmed cases can be described as a rooted tree that has a weight of infectious intensity for each edge. Upgrading edges (nodes) can reduce the infectious intensity with contacts by taking prevention measures such as disinfection (treating the confirmed cases, isolating their close contacts or vaccinating the uninfected people). We take the sum of root-leaf distance on a rooted tree as the whole infectious intensity of the tree. Hence, we consider the sum of root-leaf distance interdiction problem by upgrading edges/nodes on trees (SDIPT-UE/N). The problem (SDIPT-UE) aims to minimize the sum of root-leaf distance by reducing the weights of some critical edges such that the upgrade cost under some measurement is upper-bounded by a given value. Different from the problem (SDIPT-UE), the problem (SDIPT-UN) aims to upgrade a set of critical nodes to reduce the weights of the edges adjacent to the nodes. The relevant minimum cost problem (MCSDIPT-UE/N) aims to minimize the upgrade cost on the premise that the sum of root-leaf distance is upper-bounded by a given value. We develop different norms to measure the upgrade cost. Under weighted Hamming distance, we show the problems (SDIPT-UE/N) and (MCSDIPT-UE/N) are NP-hard by showing the equivalence of the two problems and the 0–1 knapsack problem. Under weighted $$l_1$$ l 1 norm, we solve the problems (SDIPT-UE) and (MCSDIPT-UE) in O(n) time by transforimg them into continuous knapsack problems. We propose two linear time greedy algorithms to solve the problem (SDIPT-UE) under unit Hamming distance and the problem (SDIPT-UN) with unit cost, respectively. Furthermore, for the the minimum cost problem (MCSDIPT-UE) under unit Hamming distance and the problem (MCSDIPT-UN) with unit cost, we provide two $$O(n\log n)$$ O ( n log n ) time algorithms by the binary search methods. Finally, we perform some numerical experiments to compare the results obtained by these algorithms.

Suggested Citation

  • Qiao Zhang & Xiucui Guan & Junhua Jia & Xinqiang Qian, 2022. "The sum of root-leaf distance interdiction problem by upgrading edges/nodes on trees," Journal of Combinatorial Optimization, Springer, vol. 44(1), pages 74-93, August.
    • Handle: RePEc:spr:jcomop:v:44:y:2022:i:1:d:10.1007_s10878-021-00819-w
    DOI: 10.1007/s10878-021-00819-w
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    References listed on IDEAS

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    1. Réka Albert & Hawoong Jeong & Albert-László Barabási, 2000. "Error and attack tolerance of complex networks," Nature, Nature, vol. 406(6794), pages 378-382, July.
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    Cited by:

    1. Xiao Li & Xiucui Guan & Qiao Zhang & Xinyi Yin & Panos M. Pardalos, 2024. "The sum of root-leaf distance interdiction problem with cardinality constraint by upgrading edges on trees," Journal of Combinatorial Optimization, Springer, vol. 48(5), pages 1-30, December.

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